September 28th Blog

Homework: If you didn't finish the post lab write up or Chemthinks

Lab: So today we did a lab that compared different types of metals. We first looked at their shape, color, and how shiny they were. Second we checked if the metals were conductors by using some gadget that had bulb that light up. Third we took a hammer and hit the metals to see if they were brittle or not. Lastly we took test tubes and put drops of HCL and ClC2 separately and observed their reactions.

Next scriber is Emma B

September 16th Scribepost

Homework: Webassigns due Wednesday, September 21st

Lab: The server was down on Friday, so we didn't end up watching the videos Mr. Paek had planned for us, so we went straight to the lab.

In the lab, entitled "Matter Lab Stations", we drew a picture of what we saw at each station (black, yellow, and green spheres that represented elements and molecules), wrote the chemical formulas of what was present (black=carbon, yellow=hydrogen, green=oxygen), and then compiled a list of which terms applied to that station.

Demo: After the lab, Mr. Paek did a demo to introduce the concept of physical and chemical changes -


This demo is an example of a chemical change, because (iodine) molecules are being broken apart. Wikipedia's definition of a physical change is changes that occur when objects or substances undergo a change that does not change their chemical nature. Another trick that Mr. Paek tought us when contemplating whether it is physical or chemical is to ask: "Can you get it back?" For instance, when you rip a piece of paper in half, you can simply get it back by taping the two pieces together (physical change). In contrast, if you were to burn the piece of paper, (chemical change) you can't get it back. This is an example of how combustion always results in a chemical change.

**We have that science test that everyone has to take on Tuesday, September 20th. Don't worry, it's not for a grade!

Next scriber is John B! (Sorry, completely random)

September 15 Scribepost

Homework: Atomic Level Pics 1,2, & 3 for tomorrow and Webassigns due next week!

In class today we graded our quizzes and took some notes on matter, molecules, compounds, etc. After that we had some class time to do out homework!

Notes:

-Matter: has mass and takes up space (volume)

-Mass is the amount of matter

-Atom is smallest unit of matter

-116 different types of atoms = elements

-Atoms bonded together = molecules

Molecules vs. Compounds

-Molecules: any 2 or more atoms bonded together

-Compounds: 2 or more DIFFERENT types of atom bonded together

-Combinations of different atoms and or molecules = mixture

-If only one type of atoms or molecule is present = pure substance

Mixture vs. Pure Substance

-Mixture: combination of 2 or more different atoms or molecules

-Pure Substance: only 1 type of atom or molecule

States of Matter

-Solid: atoms/molecules close together moving slowly

-Liquid: atoms/molecules medium distance moving faster

-Gas: atoms/molecules far apart moving faster

-Aqueous (aq): molecules dissolved in solution

Thats All!

next scriber is Kat!

September 14th Scribepost

Homework= Web Assignments due next week!!


Well instead of meeting in the classroom, we went to the math lab.

1. We logged on to the computers and went to moodle.
2. On moodle, we went to our chemistry class's page and clicked on the ChemThink link.( right under Web Assign)
3. After that we clicked on Not Registered, its on the right and under Forgot Your Login Info.?
4. Next you have to type in a code.(6163-2734-5502). It expires 9/28/11.
5. That will take you to another page. Type in your first and last name, a username( preferably your ID number), make up a password, click period 4 and click register.  

The assignment is to do the tutorial( Click Introduction->Click Particulate Nature of Matter-> Click Tutorial ) and while you do it, make notes in your journal, titled ChemThink Matter Notes because they will be checked by Mr. Paek.

 After the tutorial, complete the quiz. (only 10 questions)

9.13.11 Dimensional Analysis

Announcements:

1. Mr. Paek will be adding an extra day to the unit to make sure everyone understands it, by the end of the unit everyone should be confident in unit conversion.

2. Go to the math lab tomorrow for class!

Homework:

1. Dimensional analysis page 4 (NOT the page Mr. Paek handed out today).

Today in class, Mr. Paek passed out the dimensional analysis problems worksheet, he hasn't assigned when it is due yet. If you had any questions for last night's homework which was dimensional analysis page 2 & 3, we went over them in class today. After going over them, we had a short quiz on sig fig's and density.

In case anyone was dying to know if they got the extra credit on the quiz right, this is a close enough answer:

http://www.ehow.com/how_5522587_measure-density-air.html

I think that's about it.

The next scriber is Jessika, and I'm not sorry.

9/12/11 Chemistry Scene Investigation

HOMEWORK: Finish Chemistry Scene Investigation Lab, Complete Unit Conversion Sheet (if not finished already), Web Assign.

Today in class, we basically only did one thing: the chemistry scene investigation, and if you finished early, you got to chill for the rest of class. Sweet deal, man, sweet deal.

For example, in the lab, we made a table to represent the density of the four objects - A, B, C and Sample.

EQUATIONS:

mass
------- = density
volume

CALCULATIONS:

1.53g/.5ml = 2.1 g/ml

1.28g/.5ml = 1.1 g/ml

1.06g/.5ml = 2.5 g/ml

.57g/.5ml = 3.1 g/ml



That is all.

And the next person to write on the scribe is: Makenzie. Sorry.

9/9/2011 Unit Conversion & Dimensional Analysis

Blog theme music: http://www.youtube.com/watch?v=x8iTeDl_Wug

Homework: Unit Conversion & Dimensional Analysis- 2 and 3

On Friday in class we went over scientific notation and sig figs while listening to the theme music above. We then moved onto unit conversions. We went over how to convert one unit to another and did Unit Conversin % Dimensional Analysis 1 in class.

One example we did in class of unit conversions;

We want to see if the song seasons of love was true, and there were 525,600 minutes in a year, so the equation for this would be

525,600 min X 1hour/60min X 1 day/24hour X 1 year/365 days
It's hard to show on this blog but basically, you want to clear the unit on top by including it in the denominator of the thing your multiplying by

Another example we did was;
Finding out how fast Jamie walked in miles per hour, but since we calculated it in meters per second, we had to do some converting
So the work for this would be;
11meters/11.05sec X 3.28 feet/1 meter X 1mile/5280feet X 60second/1 min X 60min/1hour
This would equal 2.2 mph.

Sorry again for the equations, but it's the best I could do. Go see Mr. Paek if you need more help. But I hoped you like the blog theme music!

PS: Next scriber is the other michael

Density, period 4. 9/7/11

DENSITY

Homework: Denisity worksheet due Friday! Dont forget webassign due the 19th!

Today in class we...

1) reviewed the homework we did about desnity (Density=mass over volume). The density 3 sheet in your notebooks.

2) Then Mr.Paek told us about the lab we were doing about, you guessed it, more density!

LAB:

We used 10 mL graduated cylidners and 100 mL cylinders, a metal bar and a nail. We measured the metal bar to find the mass, and used the nail to find the nails volume by placing the nail in the 10 mL cylinder. You then found the volume of the nail by taking the original amount of water, and the new amount of water that the nail displaced, and subtract the two numbers and thats how you find volume.We also found the mass of each cylinder (10 and 100 mL), by measuring the mass of the empty cylinder, then filled it half way with water and measured that, then found the volume of the liquid by suptracting the numbers. The pages for this you would need to get from Mr. Paek.

Remember: density=mass over volume

volume=length x width x height.

Tomorrows blogger is Michael L. (It was COMPLETLY random)

Colleen L.

9/2/2011 Measurement and scientific notation

i finally got it to work.... yay!

HOMEWORK:
Measurement 3,4,5 and 6 worksheets
scientific notation-1 worksheet
finish the lab


remember the place value you need to go to for the measurement worksheets... very important

mr.paek did some of the scientific notation worksheet with us in class....

convert each of the problems into scientific notaion (2.500*10 to the third) or full decimal form (2500)....

SCientific notation:

if the number is lower than 0 then you need to move the decimal back or make it 10 to a negative (-) number.

if the number is higher than 0 then you need to move the decimal up or make it 10 to a positive (+) number.


sorry this is hard to explain...

Full decimal form:
the regular number.... nothing fancy



the person i chose next is colleen.... :(

Measurement lab and worksheets

sorry but it wouldn't work for me for awhile....

Homework: Lab report due on friday
quiz on friday
finish the lab
( we did measurement 1 and 2 in class)

Make sure for the lab and the worksheets you measure to the next spot after the one you are sure of.....
if the instrument measure's by 100 estimate to 10 place
by 1o estimate to 1 place
by 1 estimate to 0.1 place
by 0.1 estimate to 0.01 place


and so onnnn

also remember to measure from the lowest part of the bubble when measuring liquids

in measurement two the tip of the arrow is where you want to measure from.....

LAB:

MATERIALS:
metal block/bar
object A (block)
object B (nail)
100ml & 10 ml cylinder
WATER!
pencil
jumbo paperclip
meterstick

PRE-LAB:
you only have to convert units in a few problems

PART 1:
#1 it is asking you what place you need to measure to

#2 & #3 just do what it says

PART 2:
measure the sides of the metal bar and then multiply the numbers together!

write down what you calculated.... #5 asks you what place you need to measure to

#6 put the bar in a 100ml graduated cylinder after filling it to 50ml with water..... slide the bar into the cylinder so you do not break it!!!

PART 3:
measure the volume of object A

PART 4:
measure the volume of object B
explain whether a 10ml or 100ml cylinder wouldwork better

PART 5:
predict the mass of the metal bar, object A & B, jumbo paperclip, and a pencil in grams..... than actually measure it on a electronic balance

PART 6:
measure the mass of a 10ml cylinder
fill it with 5ml of water and measure it again
find the difference and the volume of the water in the cylinder

POSTLAB QUESTIONS:
you are on your own with these......



i am still the next person