December 14- Double Replacement Lab

Today in class we mainly reviewed our results from the double replacement lab that we did yesterday(Monday the 13th). The equations from the lab are as follows: If you still have any questions about balancing equations than you should either talk to Mrs. M or go to the TLC because we will be having our quest about Balancing equations this Thursday(December 16th).

Today we were also given back our partner quizzes, in which we were informed that we didn't do to well on, so tonight for homework we have to correct them. If you were absent or still haven't taken the partner quiz then you can get it straight off the moodle. The answer key to the quiz will be posted later.

DON'T FORGET: Our chemthink and webassign are both due at 11:59 tomorrow night.

Study for our upcoming quest!

Chandler F.

Scribe Post: Thursday, November 9, 2010

Hello,
Today in class, everybody present collected an Activity Series sheet, which basically showed which metals and nonmetals were more/ less active.  Next, we read the lovely scribe post from last night.  After that, Mrs. M made a quick announcement.  She told us that she would not be in class tomorrow, that page twenty is our homework, we have a partner quiz tomorrow, and to be ready for a quiz monday, a quest next thursday, and a CSI/ Winter Break party next friday.  She also told us that we will be reviewing as well as starting the next chapter on both tuesday, and wednesday.  Afrer that, Mrs. M stamped, and reviewed page eighteen (last nights homework).  Page eighteen was about balancing equations.  When balancing, equations, it is essential to make sure you balance the equation.  How do I do that? You must be asking yourself right now.  Well, when balancing an equation, you must make sure to see that all the elements in the reactants and products are equal, like a teeter-toter.  Lastly, we did page nineteen, which was about predicting products.  You do this by seeing what kind of a reaction it is, depending on wheter it is a synthesis, decomposition, single replacement, double replacement, or combustion. 

Thats all folks.

Reactant Types

Today in class, we went over the homework from last night. Then, we talked about reactant types. There are five different types of reactants:

Shown using variables:

1. Synthesis(combination)= A+B ->AB

2. Decomposition= AB ->A+B

3. Single Replacement= A+BC->B+AC

**A must be more reactive than the element it is replacing (In this case it is B).

4. Double Replacement= AB+CD->AD+BC

5. Combustion= C6H12+O->6CO2+6H2O

** Combustion works with hydrocarbons. It will ALWAYS produce CO2+H2O.

Shown using formulas:

1. Synthesis: 2Mg+O2->2MgO

2. Decomposition: 2H2O->2H2+O2

3. Single Replacement: Cu+2AgNO3->2Ag+Cu(NO3)2

** If the element is less reactive than the element it is replacing, there will be no reaction.

4. Double Replacement: Pb(NO3)2+K2S->PbS+2KNO3

5. Combustion: C4H10+6.5O2->4CO2+5H20

Homework tonight is page 18. Don't forget!

Polarity

Polarity is a theory in chemistry that tries to explain the unequal sharing or sharing of electrons. These types of sharing electrons define what type of bond a substance is. The bonds are either polar, meaning that the substance has an unequal sharing of electrons, like water, or if it is non-polar, meaning the substance has an almost uniform electric balance, like methane. Also, polarity can also affect the physical characteristics of a substance like melting point, boiling point, freezing point, etc.
The pull between the elements is considered electro negativity, and it is measured and justified by the formation of an electric dipole. What a dipole is is a separation of positive and negative charges into two poles. Furthermore, whichever element has more pull is deemed delta negative, represented by the greek symbol for delta, also with a negative sign. The one with the least pull is deemed delta positive.

Alec W.

The Valence-Shell Electron-Pair Repulsion (VSEPR) Model

At the start of class Mrs. Mandarino stamped the homework pages 18 &19.

Then we reviewed Molecular Geometry, and we started on Molecular Geometry lab.


Molecular geometry is the three dimensional arrangement of the atoms that constitute a molecule. It determines several properites of a substance.

The Valence-Shell Electron-Pair Repulsion (VSEPR) Model

There are basic shape types for molecules.


Linear: In a linear model, atoms are connected in a straight line. The bond angles are set at 180 degree.

Trigonal plannar: The trigonal planar shape are somewhat triangular and in one plane. The bond angles are set at 120 degree.

Tetrahedral: "Tetra" means 4. This is when there are four bonds all on one central atom, with NO extra unshared electron pairs. The bond angles between the electron bonds are set at 109.5 degree.

Trigonal Pyramidal: Pyramidal-shaped molecules have pyramid-like shapes. Requires three dimension in order to fully separate the electrons. The bond angles are set at 107 degree.

Bent: The final basic shape of a molecule is the non-linear shape, also known as bent or angular.


Trigonal Planar: 115 degree


Trigonal Pyramid: 105 degree

Electron Pairs on Central Atom

2/2/0 - Linear
3/3/0 -Trigonal Planar

3/2/1

4/4/0- Tetrahedral
4/3/1

4/2/2

Example:

PCl3

4/3/1 - Trigonal Pyramidal

xAFU3ts6tVM/TOM4KplfatI/AAAAAAAAAAM/lqChlwS3emM/s1600/pcl3f.gif">xAFU3ts6tVM/TOM4KplfatI/AAAAAAAAAAM/lqChlwS3emM/s320/pcl3f.gif">

HW: Tuesday, Nov.16,2010 = Molecular Geometry Lab (questions), Chemthink & Webassign

Quiz | Review | ions

At the start of class Mrs. Mandarino stamped the homework pg. 11.

Then we reviewed Lewis structure

Example:

H2O

2 x 2e- = 4e-

1 x 8e- = + 8e-

12e- Needed

Minus the total of Valence e- 8e- Total Valence e-

4e- Shared

--------.. ---------- -Has 2 single bonds with equal 4 valence e-
[ H - O - H ] -Has 4 Dots to fill in the ammount of valence
------- `` --------- e- needed.

Next we took the first quiz of our series of quizzes.

Then we went over Covalent ionic bonds.

example:

PO4(3-)

Step 1:

Count the # of atoms total. In the case its 5. 1 P + 4 O = 5.

Step 2:

Take the total # of atoms and times that by 8. This will equal the amount of Valence e- needed

5 x 8 = 40 Valence e- needed

Step 3:

Count the total number of Valence e- for both atoms.

P = 5 valence e- O4 = 24 valence e-

Step 4:

Add the valence e-. [P] 5 + [O4] 24 = 29.

Step 5:

In order to follow the octav rule you must add the 3- e- to the total number of valence e-

29 total Valence e- + 3- = 32 valence eletrons.

Step 6:

Substract the amount of valence e- needed from the amount of total e-

40 valence e- Needed - 32 Valence e- total = 8.

The total amount equals the amount of valence e- shared.

Your math should look something like this.

5 x 8 = 40 Needed

5 + 24 = 29 Total valence e-

29 + 3 = 32 Total valence e- with the 3-

40 - 32 = 8 Shared

The Lewis Structure should look something like this.

------ .. ------

| :O: | 3-

| .. | .. |

| : O - P - O : |

| .. | .. |

| :O: |

| .. |

------ ------|

Ryan G.

Lewis Structures

Today in Chem, Mrs. Mandarino got the party started by showing the class how to draw Lewis Structures. 

And here are some guidelines to drawing Lewis Structures!

Step One: Count the total number of valence electrons in the compound.

Dont forget! If you are finding the structure of an ion, remember to add electrons for a negative charge and subtract electrons for a positive charge.

Step Two: Predict the arrangement of the atoms in the molecule, drawing a line to represent a single bond between each pair of bonded atoms.

• The first atom listed in the formula is usually the central atom.
• Also, remember that Hydrogen can only be bonded to one other atom.

Step Three: Find the number of valence electrons left over after forming the single bond.

• Remember, each single bond you draw counts for two electrons.

Step Four: Place electrons around the outside atoms until each is surrounded by eight electrons. (The octect rule)

• Hydrogen does not follow the octect rule, it will only have two electrons, Boron does not follow the octect rule as well, it will only need 6 electrons.

Step Five: Place any left over electrons around the central atom.

Here's an example of how a Lewis Structure looks for CO2

Kamila W.

Naming Covalent Bonds

Monday, November 8, 2010

Naming Covalent Bonds

Today in class we began to learn how to point out, formulate, and name Covalent Compounds. Today we began class by starting working on our journals, by the end of class we had finished pages 2,3,4,5. Page 6 was our homework for tonight. Page 1 is extra credit.

How to name COVALENT Compounds:
** Write the name of the first element, add appropriate prefixes except for mono
** Write the name of the second element, drop the ending and add -ide.  Add prefiexes indicating the number of atoms.


In naming covalent compounds we use Greek prefixes:

1-mono

2-di

3-tri

4-tetra

5-penta

6-hexa

Then you add the name of the Element

**Exception- The First element for covalent compounds NEVER has a prefix!**

GOT THAT?!

-Patrick W.

Unit Review

Today we began class by stamping pg 14 and going over the answers.
The answers are as followed:

a) magnesium iodine
b) cobalt (II) sulfide
c) copper (I) sulfide
d) Calcium oxide
e) aluminum chloride
f) manganese (IV) oxide
g) Barium Fluoride
h) Sodium Sulfate
i) Iron (II) Carbonate
j) Calcium Phosphide
k) Manganese (IV)Oxide
l) Aluminum Sulfate
m) Mercury (II) Oxide

Rules to remember when naming ions
-write the cation (first part of name)first,then the anion.
-Make sure to drop the ending of the anion(second part of name) and add -ide. ex: Calcium chlorine turns into calcium chloride.
-When given a polyatomic ion look up the name
-When given a transition metal, determine the number of electrons lost and indicate the charge using roman numerals.

ex: FeCl3 (This means we have 1 Fe and 3 Cl)
Look up the charge of Cl, it's -1

Fe
Cl-1
Cl-1 = -3
Cl-1
Because there are 3 Cl's with a -1 charge, there is an overall -3 charge
Next you determine what charge you would need in order for the ion to be neutral.
In this example you need a +3 charge, so the new name becomes: Iron (III) Chloride

Next we reviewed the entire unit as a class, by filling in the Review & Topic outline pages 1 and 2.
Some of the material we reviewed included:
-Whether an element will gain or lose and election and the amount it will gain/lose.
-Completing an orbital diagram and the electron configuration
-How to write the formula of 2 given ions
-How to name the compounds when given the formula
-Naming polyatomic ions
-Naming transition metals in a formula

Homework
Study for the test tomorrow!
Webassigns due Thursday at 11:59pm

Periodic Properties Review

First in class we decided that we would take the chemistry lab test on Wednesday. Next we went over the Periodic Properties 2 worksheet (pages 12 and 13). On page twelve we went over the first five questions, they compared the first two columns of the periodic table (Alkali Metals and Alkaline Earth Metals). Remember: columns are the rows moving from top to bottom, they are sometimes also called groups. Mrs. Mandarino also noted that we must know what the term valence e- means; which is the outermost e-. (This word will be used on the test tomorrow).

Then we went over page thirteen; we firsts discussed electronegativity. Electronegativity is an atom's ability to attract a shared e-. Once a bond of valence electrons is made, both atoms will share the electrons in a shared e-.

Factors that will affect electronegativity:

• Amount of energy levels (atomic size); Less energy levels=valence electrons will be closer to nucleus=smaller atom will "hog" shared e- more.
• Shielding electrons; more shielding electrons=weaker pull from nucleus=atom will not "hog" shared e-.
• Number of protons in nucleus of atoms that are in the same period; greater pull from nucleus=smaller atom will "hog" shared e- more.

When going down-electronegativity will decrease.

Why?

-> valence e- are further from the nucleus=weaker pull=atom will not hog shared electron.

When going across-electronegativity will increase.

Why?

-> valence e- are closer to nucleus=stronger pull=atom will "hog" shared e-.

The Periodic Properties Review sheet is under the Unit 3 Periodicity Assignments. If you click on it, all the questions are answered and done for you. If you don't understand any of the questions, be sure to look back at all the worksheets we were given (pages 1-13) will help, also look through the fill in the blank worksheets we did in class. If you want extra practice or more to review print the Periodicity Practice Exam under the Unit 3 Periodicity Assignments.

*Remember: if you're having trouble always go back to atomic size.*

Also: The test is tomorrow and and the lab test was moved to Wednesday.

Effective Nuclear Charge, Atomic Size, and Ionization Energy

Today in class Mrs Mandarino first stamped our homework, which was #9 on the metal reactivity lab and pages 4-5 on effective nuclear charge. After that, we went over effective nuclear charge.

When protons increase --> greater pull on electrons, so its a smaller radius

We also learned how to find shielding electrons. The overall postivite charge that the electron gets is the effective nuclear charge (Z*). to find it, we can use a mathematical expression:

Z*=Z-S Z*- the effective nuclear charge
Z-the number of protons in the nucleus
S- the shielding electrons (electrons between the outer electron and nucleus)


Then we checked page 5. For 1, we had to find the number of shieling electrons. To do this, you cross out the highest energy level.

Example: Al 1s2 2s2 2p6 3s2 3p1
Cross out the third energy level because it is the highest and therefore the outer or valence electrons. Then you count the other electrons to get an answer of 10 sheidling electrons.

Part 2 was to find the effective nuclear charge. To do this, we had to use the mathematical expression.

Example: Al- Z*=13-10=3
13 is the number of protons in the element Al and 10 is the number of sheilding electrons. The answer 3 means that there are "3 protons pulling on the electrons"

Next, we learned about Atomic Size. We figured out that when you move down a column, the effective nuclear charge (Z*) stays the same. When you go across a row, (Z*) goes up. So the pull is stronger to the nucleus. More energy levels make the size of the atom larger, and a higher effective nuclear charge will make the size of the atom smaller.

Then we talked about Ionization Energy. This is the energy that can get the electron to completely leave the atom. So, the greater the force is that holds the electron in place, the more energy it will take to remove the electron.

When you move down a column, (Z*) stays the same, and the atomic size increases because there are more energy levels. So the ionization energy will decrease because the outer electrons are further from the nucleus. As you move across a row, ionization energy will increase because there is a stronger pull from the nucleus.

The homework for tonight was to do pages 10 and 11 and work on the webassigns!

Periodic Trends

Wednesday, October 20, 2010

Today we picked up pages 4,5,6, 7, Ionization Energy and Atomic Radius. The lab and pages 1,2, and 3 were then stamped. Next we worked on Part C of Metal Reactivity: Periodic Trends Lab. We then answered the questions on Metal Reactivity: Periodic Trends Lab, Periodic Table Practice 1(pg. 2), Periodic Table Practice 2 (pg. 3), Ionization Energy and Atomic Radius. Sheets and answers can be found on Moodle.


Homework was Webassings, #9 on Periodic Trends Lab and to read worksheet #4 and do worksheet #5.

Also Mole Day is Friday October 22 in the east gym at 6:02 a.m.

Participants will receive extra credit and don't forget to bring cans with.

Tuesday

Hello Class, I am sorry for creating this scribe post a day late but i shall quickly get to explaining what we did on tuesday. It was a very interesting class, i learned alot. We went to the science lab and logged on our computers, however our professor instructed a lesson first. She explained Periodic Trends which most of our class found extremely interesting, i learned that the atomic radius increases as you move down the periodic table. I did not know that before. We also learned that the atomic size decreases moving right to left on the table. After the lecture, we proceeded to our desktops on created graphs showing what we learned on Microsoft exel. Once we were finished we printed our graphs from the printer and took them home. It turned out to be a great class, filled with learning and i will cherish it for the remainder of the school year.

Thank You, Sincerely, Yours Truly Matt I

Metal, Non-metal, Metalloid

Monday, October 19, 2010

 Today in chemistry, our great teacher, Mrs. Mandarino stamped our alien homework that was completed a long while ago. Today we finished Metal, Nonmetal, and Meatalloid lab table. Then for homework we had to finish all the post lab questions that went along with the lab. After we finished up that lab we then started on our Periodic Trend Lab. We observed certain elements and how their reactions became more extreme the more we went down the list. Today was a fun day and instead of deciding who I want to scribe tomorrow in class I am going to pick now. Matt I. is going to be the scribe because he is going to ditch football and watch friday night lights.

Eric D.

Orbital Diagrams

Today we stamped and went over the homework on page 9. We also were assigned tape dispencer numbers. Next we took notes on orbital diagrams. We learned that orbitals are expressed by using a box and each orbital can hold a maximum of 2 electrons. 

                             Number of Electrons                Number of Orbital Boxes

s                                max. of 2e-                                         1

p                                max. of 6e-                                         3

d                                max. of 10e-                                       5

f                                 max of 14e-                                        7

• The up arorows in the boxes indicate electrons

• The up down arrows indicate e- with opposite spins

• Fill e- in the box individually first then double up

Homework was to finish page 10 and 11, work on Webassings and ChemThink. Test on Friday.


Kendall K

Electron Configuration

Today in class Mrs. Mandarino stamped page 5 that was for homework and later went over it in class.

Remember...

-No Charge = Same Number of Protons and electrons

-Negative Charge = More electrons than protons

-Positive Charge = Less Electrons than protons

After homework we started talking about the s, p, d, f orbitals.

- s orbitals: Can hold a max of 2e-

- p orbitals: Can hold a max of 6e-

- d orbitals: Can hold a max of 10e-

- f orbitals: Can hold a max of 14e-

Then we learned about...

Electron Configuration: "Adresses" or maps where we are most likely to find electrons.

- Example: 1s² 2s² 2p^{3 = N}

We used our periodic tables she gave us sometime ago. We labeled some parts of the periodic table with..

- 1s-7s

- 2p-6p

- 3d-6d

- 4p-6p

- 4f-5f

Ask Mrs. Mandarino or another student to show you how they labled it.

Today was pretty confusing. Suggest going to Mrs. Mandrino or the TLC for help if needed.

Today in class Mrs. Mandarino checked in our homework which was to complete the fireworks lab and pages 3 and 4. Then we went over the Rutherford simulation that we started on Wednesday after that we went over the fireworks lab. The fireworks lab was a lab where we wrote our observations on the fire that was created when we burned different metal ions. Next we went over pages 3 and 4 which were about atomic structure, the pages mentioned protons,electrons and neutrons and where they are located and whether their charge is positive or negative.They also included what a mass and a atomic number is,the atomic number is is the number of protons.At the end of class we looked at the power point and talked about the modern view of an atom and how its mainly empty space.We also looked at the different shapes of orbitals including s,p and d.

Homework: Pg. 5, read pg. 141-143, and webassign

Atomic Models Cont.

Friday, October 1st, 2010.


Today in class, we finished the class notes about atoms, and what Rutherford and Bohr did to help discover more, their experiments, and also the model of their atom. Afterwards, we did a lab called the fireworks lab, where we discovered what specific types of metal salts made what specific colors. After we all finished the lab, Mrs Mandarino gave us 3 mystery salts to solve. They related back to the salts we tested back in the lab.

The HW was to finish Chemthink, if not done already, and finish the questions for the fireworks lab :)


Alec W.

Science Lab

Today Mrs. Mandarino told us that we could find worksheet pages one and two on moodle if we didn't have them already. We spent the class period in the science lab today also. In the science lab we did chemthink for atomic structures and ions. The only homework is to work on webassigns and chemthink(if not finished in class).





Owen Cole

Atomic Structure

Today Mrs. Mandarino gave us few minutes to finish up the Atomic Scientists worksheet, which we got it yesterday. And she also gave us progress reports including the grade of our lab test.

We started notes about Atomic Structure. There were notes about history of the atom and contribution to the Atomic Model.



Dalton Model of the Atom

-Late 1700's - John Dalton- England

Teacher- summarized results of his experiments and those other's

Combined ideas of elements with that of atom in Dalton's Atomic Theory



Thomson Model of the Atom

-J.J. Thomson- English physicist. 1897

Made a piece of equipment called a cathode ray tube.

It is a vacuum tube- all the air has been pumped out.



We did not get to Bohr's and Rutherford's notes yet.



At the last 10 minutes of clase, after taking some notes about Atomic Structure, we started Rutherford Simulation Lab. We didn't get to finish the lab.

HW: Read textbook pages 104-107 / W.A.

Black box lab & atomic theory greeks Dalton/Thomson

On Tuesday Mrs. Mandorino gave us approximately 2-4 minutes in completing the lab test. After finishing the lab tests we started on the black box lab. We had plenty of time to finish up the lab. Inside the obcertainer was an odd shaped or geometrical shape that caused the sphere to act abnormal. After the lab we read the green and pink sheet that talked about Dalton and Thomson. Finally we filled out the charts on the white sheet that corresponded to the pink and green sheets.

Dalton- experiment (analyzed the masses of substances that combined with one another.) Major contribution(The relative sizes and characters of atoms and how they fit together

Thomson- experiment(the ray in the tube was blocked from reaching positive, the positively-charged plate, when a object was placed in its path.)Major contribution(Electrons were universal, that matter somehow was built from them.)

Homework: Finish black box lab questions.

Anson.V

Tests back + Lab re-takes

Today in class we received our unit 1 tests back. We reviewed all of the answers as a class and then were given an updated grade report. Afterwords, we spent the remainder of class retaking a new written portion of the lab tests from Wednesday, (Sinking test tube lab) because apparently we all failed the first time.

Homework
-Read textbook page 101-106 & Webassign.
If you were absent or marked absent on Chem day you must make up the assignment.
-Make-up assignment for Chem Day is textbook p. 58 #36-53.

Chemistry Basics Review

In class on Tuesday, we first went over extra our  chemistry basics review worksheets. The questions from the review cover what will be on the test on Thursday. Some of the topics are:

• Particulate nature (see particulate nature tutorial if you are having trouble)
  -Remember diatomic atoms; hydrogen, oxygen, nitrogen, chlorine, bromine, iodine and flourine, or ClIF H BrON, or HONCl BrIF
• Physical or chemical changes that happen (notes are on moodle, also look at page 17 for help)
• Conversions/Metric system (notes are on moodle, and look at pages 1, 11 and12)
• Sig figs (notes are on moodle, and look at pages 3 and 4)
• Scientific notation (look at pages 5 and 6)
• Correctly reading/measuring data (look at page e2 or your measurement lab)

Physical or Chemical Stations

Today Mrs.Mandarino started yelling at us about how dirty the lab table was so we cleaned the lab tables. We also moved up our seats to the front. We went over the homework which was due long time ago(pg.16). We also went over page 17 and the lab we did on last friday. We got our quizes back to study for the test that's coming up.

Homework:
Review Chapters 1 and 2
Webassign, Chemthink

Atomic Level Pictures

Today well actually on thursday.
we learned difference between atom, molecule, element, compound.
atom: Most basic unit of matter
molecule: group of atoms held together by a chemical bond
element: made of a single type of atom
compound: molecules made up of more than 1 kind of atom

And also we learned atomic level pictures for each situations.
and learned how to write the formula for each atomic level pictures.

Chem Think

Today we went to the science lab for class. We went onto our student email to accept the invitation to the blog. Then we went to Chem Think and watched the tutorial for the section Particular Nature.We took notes on the tutorial then got started on the quiz based off that information. If it was not completed in class, then it is for homework along with finishing the Webassigns :)

More Conversion Factors.....

Tuesday, September 14, 2010

Today our day was slightly shorter than usual. We reviewed the homework of the previous night (on pg.11) and once again reviewed unit conversions. After that we started learning and talking about Atomic levels. We took notes on pg. 13. We covered the definitions of Atom, Molecule, element and compound. We also started to identify them given visual diagrams.

Homework:
Work on Webassigns
Josh

Quiz on Lab Tools, Metrics, Sig Figs and Density

Monday, September 13, 2010



Today as we walked in to class we picked up page 12 from the front desk. We then reviewed the scribe post from Friday on unit conversion factors. After that, we took our first quiz which was on lab tools, metrics, sig figs and density. We were also given an extra credit opportunity that involved recording the correct measurements of an index card and a post-it note. We were also told to find the volume of water that was in the graduated cylindar. Then we spent the rest of our time going over our homework on conversion factors.

Homework:
Page 12 "Unit Conversions Basic"
Work on Webassigns

More Density and Conversion Factors

Friday , September 10, 2010


Today we started class by reading the scibe post. We found that we needed to review density a bit more. Therefore Mrs. M went over the homework really thoroughly. We found that we have to read the questions carefully to determine what the question is and what is the given information. Sometimes it helps if we list out our information.
Mrs. M showed us how the density of a mehane bubble is less dense than air.  Before it reached the ceiling, Matt lit it on fire like the the college students in the below picture:

** NOTICE THAT THEY ARE NOT USING PROPER LAB SAFETY.  Can you see what they are doing wrong?

Next, we began conversion factors. We saw that when we are changing or converting one unit into another unit, we must be careful to place the values in the appropriate spots so that we can cancel out the unit that is not wanted. For example, when converting 127.5 inches into meters, notice the placement of the units.

127.5 in    x    2.54 cm     x       1 m      = 3.24 m
                         1 in              100. cm


We will work on conversion factors on Monday as well.

Homework:
Webassigns
Worksheet p.11
Study for quiz on Metrics, Sig Figs, and Density

Density

Wednesday, September 8, 2010

• Today we turned in our formal labs for the Alka Seltzer part 3.
• We then continued our discussion on scientific notation and density. On our homework, we saw that object 1 data was for a regular shaped object so we used length x width x height to determine the volume. Object 2 was a irregular shaped object so the data reflected a volume determined by water displacement.
• We then completed the first two sections of the density lab. Below are the objects we were given.

Remembering what we learned in the homework, we used L x W x H to determine the volume of the regular shaped object.

• We will finish the last part of the lab on Friday.

Homework
Continue working on webassigns. Not many people have started - Do not wait until the last minute!
Finish worksheet p. 8

Sig. Figs., Scientific Notation, & Density

September 7, 2010

Today in class, Mrs. Mandarino made sure that the whole class knew how to create and invite people to a Google Doc. There was no homework to check in today. Then for the rest of the class we worked on Sig Fig Rules and Scientific notation.


We finished up the Sig Fig Rule sheet in class today, reviewed scientific notation and learned that density is Mass over Volume. When dividing the numbers, remember to use proper sig figs.


We only started the Scientific worksheet and the rest of it was for homework, but we learned that if you have to go left to find the decimal point then your exponent wil be negative (I.E. 7.300 x 10^-5= .00007300) and if you move the decimal point to the right then your exponent will be positive.


The homework for today was to finish your Google Doc and either send it to Mrs. Mandarino or bring in a hard copy, work on webassigns and ws p. 5 & 6 #2.
 
Eric D.

Metrics & Significant Figures

September 3, 2010

Today in class, Teacher checked in our homework (notes and worksheet pages on Metrics and Measurements). Then we completed the following worksheet pages as a class.

We learned about the sig fig rules:

• Digits other than zero are always significant
• Zeros between non-zero digits are always significant
• Any final zero number used after a decimal point is significant
• Zeros used solely for spacing the decimal point are not significant.

Here is the homework: Friday, September 3,2010 =

1. Work on Formal Lab
2. Webassign- Expermental Design and Measurement and Sigfigs.

Chris J.

Metric System and Technology

September 2, 2010
Today in class we covered a decent amount.

Mrs. Mandarino started class by explaining Moodle to enhance our knowledge regarding it. Please use this as our home base. This page contains all of the necessary information on notes, assignments, labs, calendars, and homework. It also provides us with the necessary links for webassign, chemthink, etc.

After, we took notes about the Metric System (SI), and learned how it exactly functions.

• We learned that this is a base 10 metric system used all over the world.
• We can add prefixes to the base units. See notes for proper prefixes.
• We must measure correctly to get proper data. ie: always measure at the miniscus and always measure one value past the last marked value - make sure to notice the smallest markings on the lab equipment. This will improve accuracy and precision (significant digits).

Later on the projector we looked at graduated cylinders with liquid inside, and practiced measuring it, we also looked over the measurement lab which should now be finished.

In the final minutes of class we looked at how to sign in to WebAssign and ChemThink


Matt I

Lab Safety and Lab Techniques

Today in class we went over Lab Techniques. Lab Techniques are safety tips for experiments. (Sub today)
Some examples are:

1. Do not bring food or drink into the work station

2. Wear safety goggles at all times


Know where all the safety equipment is located too. (ex: Exits, Shower, Fume Hood, etc.)


We also learned about Lab Equipment. These are tools you use during your experiments.


These include:

1. Beakers

2. Thermometers



After we went over the Lab Equipment and Safety Worksheets, we watched a video on Lab Safety. (We didn't watch the second one because the sub wanted us to start our lab.)



Our lab was to try out the Lab Equipment. We didn't have time to finish it all.



Here is a video of one thing a group did with the equipment:




Homework:

Finish Lab Techs - Add 3 more safety rules

Moodle Video (How to Create a Google doc)



Megan D.

Alka-Seltzer Lab Wrap Up

Overview of Class Time:

Today we did the third and final part of the Alka-Seltzer Lab. In part two of the lab we had to test the different reaction times when you drop Alka-Seltzer into a film canister filled with a certain ammount of water. In part three we got to choose our own variable, some chose to test with warm water, some with cold and some tested with a larger ammount of Alka-Seltzer.

Homework:
Read Pages 20-25 in the text
Begin Formal Lab Write-Up

Patrick W
Have a good day :)

Experimental Design & Alka Seltzer Lab

August 27th

Today in class we started the Alka-Seltzer Lab. 

1. We went through what the problem of an experiment is
2. We learned that a vaild experiment includes variables:  

• Independent variable- what you are testing
• Dependent variable-what you are measuring
• Controlled variable-what is being kept the same

                                    ** See Moodle for full notes

     3. Keep collecting data until you get the same results. 

The lab variables were the film canister, the Alka-Seltzer tablet, and water.

Each trial we did something different, like changing the amount of water. 

We timed each trial. 

Alka Seltzer rocket after it reacted

Watch video for reaction

Homework:

Prepare part 3 of the lab

Determine the variables

Mary K.

Policy Wrap-up and Procedures

August 26th

• We took a non-graded pre-test in order to collect data about our initial knowledge of chemistry.
• Again, in order to sign into moodle, (which if one is reading this they successfully have) use your normal school login. 
• To send in a scribe post, send it in e-mail format to Mrs. Mandarino until further notice.
• Bring in your science goggles tomorrow!
• For homework, read text pages 7-11. 
• Begin thinking of ideas for solving the Alka-Seltzer Lab. 

Allie K

First Day Policies and Tools

August 25th
• Class started with assigned seats.

• Everyone picked up 5 different papers.
- 3 half sheets (including the syllabus) to put in a composition notebook
- a safety contract that needs to be signed by you and your parent
- a student information sheet which you need to fill out

• Log on to your Moodle account and check out the chemistry page- it
gives the homework, an outline of the unit, notes from class, and labs.

NOTE: You may only use a composition notebook (not a spiral) and you do not need to bring your chemistry book to class, unless told otherwise.
Phoebe H

Scribe List

Melissa B.       Ryan G.           Chan P.           Allison K.

Owen C.         Joshua G.        Rachel K.       Abraham P.

Eric D.            Phoebe H.       Young Jik K.  Rima S.

Meghan D.      Mathew I.        Mary K.        Anson V.

Chandler F.     Christopher J   Kendall K.     Patrick W.

Danielle F.       Kevin J.            Alec W.

Welcome Post

Let the fun begin!

Welcome! You have sucessfully found our class blog. This is a place to see what happens in class everyday. It can help you review; ask a question that you didn't get a chance to ask in class; or find out what you missed if you have been absent. Please feel free to share this blog with your parents.

Before you begin blogging, please view the video to learn how to become an author on our blog. Please be sure to choose an appropriate screen name. This name should allow me to identify you while also maintaining your privacy. Please do not use your last name! Before you dive into blogging, please read this entire post.

How to become an author on our blog

What is a scribe post?

When we think of blogging, many times we think of posting ideas on facebook or twitter. While we use blogging for social networking, it can also be used as a valuable educational tool. Every day one student will be responsible for creating a post describing what went on in class that day. These posts are called scribe posts and will be the bulk of our blog. The person who makes the scribe post for the day will assign the scribe for the next post the following day in class. Once you complete your post, please make sure to cross your name off the scribe list on the next post.

Labels
Labels are also known as tags. They are important in keeping our blog organized. They will also help me keep track of your contributions for your grade. You must include the following 3 labels:

1. Your name = please use your first name and last initial
2. The unit we are studying = see moodle for appropriate unit names
3. The type of post it is = Most will be "scribe" posts. Later we will introduce the "on my mind" post.

Digital Ethics!
Remember, blogging is a very public arena. Anything you post on the internet, will always be on the internet. Even if you delete a post, it may remove it from the blog, but copies of the post may exist all over the internet. Therefore, we must be very careful to respect your privacy and the privacy of other classmates by:

1. Using only first names.
2. Never posting any pictures of ourselves.
3. Never including information about activities in our own lives.
4. Always using good judgement.


Blogging rules to live by!

1. Blogspaces are classroom spaces. Speech and actions that are inappropriate for class are also inappropriate for our blog. Please remember to always be respectful.
2. NEVER give out or record personal information on our blog. Do not share anything that you do not want the world to know.
3. Remember, our blog is a public space. If you put it on the internet, chances are that it will remain on the internet for a very long time. These posts may effect your future. It might be possible for a future employer to discover things about you through thoughts you posted in your younger years. Be sure to post thoughts that you are proud of.
4. Never add a link to your post that you have not thoroughly read. Make sure you want to be associated with the link before you add it to your post.

*** Please take a few minutes to view the following video!