9.30.10

Anouncements:

• If Mr. Paek is not in class he has asked for us to be nice to the sub
• Tomorrow we will be in the computer lab or we may do a fireworks lab
• There will be a quiz sometime next week

Homework:

• Page 118 #14
• Read pages 106-109

In class:

• Got 6 pages to tape into notebook (to be taped as shown)

- 2 Atomic Model pages

- 2 Atomic Structure pages

- 2 Rutherford Simulation lab pages

• Completed Rutherford Simulation lab with a partner

- Put black carbon paper upside down on top of a white sheet of paper with 6 circles with a small square in the middle of each one

- Take small yellow ball and bounce it on the carbon paper around 100 times

- Answer questions using calculator

• As a class we answered questions 1-8

- Do not use ruler - only a calculator - for these questions

• Talked about what the lab represented relative to Rutherford's experiment with the foil

- White paper: gold foil

- Circles: atom

- Marble: (+) random particles

- Squares: nucleus

• Finished questions 1-4 on back page of lab in class

Exam: 10/8

Lab Exam: 10/11

The next scriber will be Andrea.

9.21.10

Homework Read pgs. 106-109 and complete pg. 106 #14

Today in Class

Today in class, we worked on and finished up the Atomic Scientists worksheet. We will be able to use this on the upcoming quiz, so it is important to take good notes on scientists and their contributions to the development of the atomic theory.

We were told by Mr. Paek that are goggles needed to be in Zipblock bags incase of spread of pink eye or infection. If anyone has not done so, make sure to do it tomorrow in class.

Next, we took notes on a powerpoint that was all about the four atomic scientists. The first scientist was Dalton, who in the early 1800s contributed the solid sphere model. He concluded that each element is made of atoms, atoms of one element are identical, compounds are made from different elements in whole number ratios, and that chemical reactions involve the rearrangement of atoms. The next scientist was J.J Thomson who concluded in 1897 that negative atoms must have a negative charge, and negative is negative, with overall neutrality, then must also have a positive change. He found this out by holding a magnet to sides of a tube and noticed a bend in the light. The positive side attracted the beam and the negative side repelled the beam. Another scientist was Ernest Rutherford, who in 1911 shot an alpha particle (positive charge)through gold foil. Most all went through some had deflected. He found all atoms have a tiny positive center called the Nucleus. The last scientist was Niel Bohr who in 1914 found that electrons "orbit" around. Electrons move around the nucleus in a cloud.

Pictured below are each scientist's Atomic Model

Bottom left to right:Bohr's atom, Current orbit atom

Top left to right: Dalton's atom, Thomson's atom, Rutherford's atom

Upcoming test-October 8th, lab test-October 11th

NEXT SCRIBER ..MAHAK!

9.28.10

Homework:
Read pages 101-106 in the Chemistry Text Book. There is no question today.

Class Today:
The lab today was called the "Black Box Lab." You went around the lab stations trying to find out the blockade in the black circle container. It was filled with a bead and you had to figure out the blockade without opening the box. After you felt confident in your answer you had to write the numbger of the black box down and then draw what you thought the blockade was. It was extremely confusing and difficult, often leading to extremely odd answeres from some of the class members.

This however was an extremely amazing metaphor for scientists Dalton, Rutherford, Bohr and Thomson whom all tried to decide what the shape of an atom was. They didn't have any microscopes that could see anything that tiny. Hence, the "Black Box Lab."

Reminder:
There is going to be a quiz on all four of these scientists soon. Do the worksheet assigned today that you can use on the quiz. Take notes from the four sheets that Mr. Paek gave us and you'll be good to go.

Also, the test is on Oct. 8th and the Lab test is on Oct. 11th.

Plus, if you want to retake your Lab Test, then tell Mr. Paek what day and period you're coming in.

The next scriber will be Kaylee.

9.27.2010

UPCOMING:
We will be having a Conversions Quiz either sometime this week or next week.

HOMEWORK:
no homework was assigned today.

BEGINNING OF CLASS:
Our lab notebooks were handed back but Mr. Paek did not get a chance to grade them. There were 4 sheets at the front that needed to be picked up.

Those sheets included 2 pages of the Unit 2 Schedule and the other 2 included the newest lab we will be doing this week called The Black Box Lab. (Also make sure to leave an open page between the Unit 2 Schedule and the New Lab.)

DISCUSSION:
Mr. Paek then mentions our Unit 1 Lab Tests and how the average of all the periods was VERY low. But on the bright side our Unit 1 Tests had very high marks. For our Lab Tests, if you decide to, you may retake them individually WITH the full 50 minutes.

The Lab Test has been improved where Mr. Paek added specific questions to guide you if you're completely lost on how to do this lab. You may retake them during lunch or after school by visiting Mr. Paek, NOT the TLC or testcenter.
Overall, the Unit 1 Tests turned out to be very good for most classes. Near the end of class Mr. Paek answered questions that we may have had relating to the Unit Tests.

END OF CLASS:
Our grade reports were handed back at the end of class today. Mr. Paek decided that he would not include the grades titled 'Texting', and also 'OnMyMind'.


the next scribe will be...RAINA!!

9/21/2010 Blog

Upcoming Events:
-Wed: Lab Test
-Thurs: Test, study using class blog and in-class notes
-Fri: Chem Day (same thing as Bio day, apparently better)
Homework:
-Study for Lab Test, Tomorrow
-Study for Chapter Test, Thursday
-Post 2 comments on Blogger- Go to Period 2 Chem Blogs, go through the list of blogs. Select 2 of the blogs on list and comment on something about the post. Don't be too brief, suggest what can be done to make it better, or what they did a good job on.
- Complete the 4 Chem Review pages
- Complete Chapter 1-2 Review sheet
- Mr. Paek collecting journals, Thursday. Make sure no falling papers
Overview of Today:
Today in class we talked about the information listed above. Then with the remainder of class we completed the 4 pages of "Chemistry Basics Review." Some people able to complete in class, if not completed in class, then rest that was not completed is for homework. Here are the pictures of the in-class work/homework if not completed. These pages have my answers to the "Chemistry Basics Review" pages and there is no guarantee for correct answers.

Next Blogger: Rachel Mitchell (voted by class)

9.20.2010

REMINDER:

1. Go study off the blog
2. Mr. Paek is collecting the study guides Thursday
3. The lab test is Wednesday and the real test is on Thursday
4. web assigns are due tomorrow
5. need two comments on someones scribe post

Today in class we took a quiz, if you did not take it then go to the test center it should be in there.

The next scriber will be.... John.

The Scribe List

This is The Scribe List. Every possible scribe in our class is listed here. This list will be updated every day. If you see someone's name crossed off on this list then you CANNOT choose them as the scribe for the next class.

This post can be quickly accessed from the [Links] list over there on the right hand sidebar. Check here before you choose a scribe for tomorrow's class when it is your turn to do so.

IMPORTANT: Make sure you label all your Scribeposts properly (Your display name, unit title, scribepost, and p2chem2010) or they will not be counted.

Jimmy          John A.   Andrea          Max       Micaela    Kimmy          Frankie          John H.            Ose            Agatha          Zak          BigMoneyBen          Mahak          Kevin          Paul          Rachel             Elizabeth     Raina           Monica          Kaylee          Yassine          Jill          Vit          Michael          Brandon

Friday 9.17.10 - Matter Lab

REMINDER: Extra credit packet available in the TLC. Look in the bin for the lab we worked on Friday.



HOMEWORK: Webassign due Monday along with review sheet.



LAB:

We worked on a matter lab. We went from station to station looking at models of different atoms and molecules etc. We had to draw what we saw then write the formula of it. Finally we described it (compound, pure substance, element etc.)

EX: Picture: Formula: Terms:
oo oo ooo, 2N2 +N3, Element, pure substance, molecule

NEW TERM:
diatomic molecules- molecules that will always be in pairs when they are alone

H O N Cl Br I F (sound out the word to remember the elements)

Ex: oxygen (O) will always be O2

Scribepost Format

Title:  day and date - for example - 11.13.10

Announcements - put any here

Homework -  put any here

Body:  this is solely up to you how you do this.  please remember, you don't do many of these - do yours the best that you can - for yourself and for your classmates.  Headings in bold, pictures, videos, examples, announcements, homework are some of the elements that make for a successful post.

End with a pick of who the next scriber will be.

Labels: Need 4 of them:

1. your display name
2. unit name
3. scribepost
4. p2chem2010

Thursday 9,16,2010

Today in the beginning of class Mr Paek made a couple of announcements about the upcoming week, here are the dates:

• chem think is due tomorrow-17/9
• web assign is due Monday-20/9
• Quiz on Monday-20/9

Quiz will be on molecules,atoms,compounds, the quiz will also have like 1 density problem and 1 measuring problem.

• lab test Tuesday-21/9
• test - sometime during the week.

Then Mr Paek explained to us the difference between physical and chemical change:

-physical change: do not affect chemical position.

some chemicals present.

same arrangement of atoms.

-chemical change: alter chemical composition

new chemicals formed

bonds broken and formed

rearrangement of atoms

after we did a chemical and physical changes sheet. we had 17 examples, where we had to decide weather the change is physical or chemical.

-some examples:

snow turning into water= physical change

hammering gold into a thin sheet=physical change

phosphorus burning=chemical change

We then did the physical or chemical stations lab: the lab was really easy we had to go through stations.

examples= in station 1 we had to watch melting candle wax, which was physical change. then burn candle wax and wick, which was a chemical change.

in station 4 we had to add water and food coloring, which was physical change. then melt ice in water which also was physical change.

Semptember 15 2010

Today we got 2 sheets for an online activity we did for most of the day. the 2 sheets can be found in the front right of the room in the box. The sheets were about a website chemthink where we practiced stuff having to do with elements atoms and molecules.

go to http://www.chemthink.com/ and use this code to sighup 4160-3702-9971 next set up your account. make your username your first initial and your last name.

After you sighn up click on introduction Particulate nature of matter then tutorial. After your done with the tutorial click on question set and try to get 10 right before 3 wrong for credit.

Tuesday 9.14.2010

Today in class we learned about atomic level pictures. We defined the terms:

• atom - most basic unit of matter
• molecule - group of atoms help together by a chemical bond
• element - made up of single type of atom
• compound - molecule made up of more than one kind of atom

Then we did a couple of problems from the worksheet to furthermore explain the difference of these four terms and learn to distinguish them.



In this problem we had to decide for the each of the atomic level diagrams whether they are elemets or compounds and consisting of either atoms or molecules.

Then we defined two more terms:

• pure substance - all the same
• mixture - has different kinds

To get a better understanding of what these terms we did another problem from the worksheet.



We also learned how to write formulas for atomic level pictures.



After that we practiced drawing the atomic level pictures according to the formulas that were given.

Then we had even more practice with writing the formulas and descriptions for the atomic level pictures and also drawing the atomic level pictures based on the formulas.





Once we were done with everything, we had some time to just talk to other people untill it was time to go to the fall sports assembly.

9.13.2010

Today in class we took the quiz that was supposed to be on Friday but, was switched to today. If you did not take the quiz you can make it up in the test center. After taking the test we went over it shortly and did not have time to go to the writing lab like was planned.

Friday September 10, 2010

Today in class we started off my going over unit conversions on page 11. A problem that we did in class was this, If a glacier flows at a rate of 32.5 feet per year, what is its speed in cm per hour?

1.To start to solve this problem you must put 32.5ft over one year.

2.Then multiply this by 12in over 1 ft and then the feet cancel out.

3.Next multiply 2.54cm over 1in and then the inches cancel out.

4.Then multiply 1year over 365 days, the year will cancel out with the year from the first step of the problem.

5 And finally you multiply 1 day over 24 hours, but to get the answer you have to multiply all the numbers on top and then divide by all of the numbers on the bottom. Once you do that you get .113 and thats your answer.

After we went over conversions, Mr. Paek showed us how to get on Web assign, which is the homework. To get to Web assign go to your moodle account. From there go to chemistry with Mr. Paek, and then press on the Web Assign Link. A quicker way to get there is to just go to Webassign.com. Once you get to Web Assign you sign in. It will say institution and there you put glenbrooksouth.il then your password AND your username will be your id number. Once you get into web assign there are a number of assignments that are all due the day before the test. Most of them we have already learned but some of them we haven't. F0r the web assigns the questions that have more then 2 answers, you get only 2 guesses on. And for the questions with only 2 answers you only have one guess. Once you are done with an assignment you press submit and it will tell you all the questions you got right. During class we went to the computer lab and worked on web assigns for the rest of the period.

Wednesday September 8, 2010

Today in class, we finished our labs working on density that we started yesterday. Next, Mr. Paek showed us a demo by using gas, a special type of soap, and a long stick with fire on the end. He had a volunteer shake and pinch on the tube from where the gas was coming from in order to make the soap from inside the beaker rise into the air as a bubble. Once it did, he poked the stick on fire at the rising bubble and a big burst of flames came from the air.

After the demo, Mr. Paek reviewed with us about finding the density of certain objects, and the ntaught us about using Unit Analysis. This means that the units in the numerator and the denominator cancel out so then another unit used will replace its spot. For example, if we are trying to figure out the number of seconds in 1 day, then we would write out the equation like this: 1 day/1 x 24 hrs/1 day x 60 min/ 1 hr x 60 sec/ 1 min = 24 x 60 x 60= 86,400 sec in 1 day. This works because the units day, hrs, and min cancel out which leave sec as the remaining unit for the final answer.

Since we didn't do so well on the last section of the quiz we took last week, we have a quiz on friday covering the same material. So our only homework for tonight is to study measuring the volume of water in graduated cylinders and note cards, and make sure you make 1 guess.

Tuesday 9.7.10

Today in class, we started off by going over the basics of density (the formula and units of density). The formula for density is . In order to find mass and volume we need to know the units of mass (grams (g), kilograms (kg), and milligrams (mg)) and volume (milliliters (mL), Liters (L) and cm (cubed)). We followed this up with examples of finding density to get a better understanding for the material (Ex: If the mass of a powdered substance is 6.52 kg and the volume is 22.4 L, what is the density? You would then go on to put the mass (6.52kg) over (divide by) volume (22.4 L) and get 6.52kg/22.4L= .291 kg/L, and because it is multiplication, the answer has to match the lowest amount of significant figures, in this case, 3).

We also did an example of the different densities of substances in water and found out the a substance with higher density than all the rest sinks down to the bottom and the substance with less density than all the rest, floats to the top. All the substances in between then order themselves from top to bottom going from least dense to most dense in a totem pole looking fashion. We finished up class with a Density lab. For this lab we needed a regular object, an irregular object, a ruler, a balance and a 10 mL and 100 mL graduated cylinder.

In this lab we found the mass of a regular solid object (a metal rectangular prism) using the balance to "mass" it and the volume using the formula of Length x Width x Height. We then used these measurements to calculate the density of the solid using the equation .

To then find the density of an irregular solid object (a metal nail) we measured the mass using a balance. To get the volume we filled a 100mL graduated cylinder about half full of water. Once we measured the exact volume of the water, we added the nail and then measured the volume again. To get the volume of the nail, we subtract the initial volume of the water from the volume of the water with the nail. Once we have the mass and volume we again use the formula to calculate the density.

Finally, we measured the density of a liquid. We first measured the mass of an empty 100 mL graduated cylinder. Once we got that measurement, we filled the cylinder about one third full. We then measure the mass of the cylinder plus the liquid and then subtract the cylinder's measurement to get the mass of the liquid. We then get the volume of the liquid simply by measuring it in the graduated cylinder. Once we have the mass and volume, we calculate the density one final time by using the formula .

Our homework for tonight, is to complete pg. 9 which Mr. Paek gave out at the beginning of class to go in our notebooks. This is simply just more examples of finding the different components of the density formula ().

Friday 9.3.10

Today we started the first few minutes of class making sure that everyone was able to access their blogger and google apps account (and as it turns out, mine works). We then proceeded to review the rules of significant numbers. The significant figure rules state that all non zero numbers are significant, zeroes between significant numbers are significant, any zero after a decimal is important, and that any zero used as a placeholder is not significant. After the short review we learned the rules to add, subtract, multiply, and divide using significant numbers. The rule for adding and subracting is that you round your answer to the same number of digits past the decimal point as the smallest number of digits past the decimal point. For multiplication and division, you round to the smallest amount of significant numbers. Finally we learned about scientific notation. When writing a number in scientific notation, you move the decimal until it is directly behind the first significant number and multiply it by 10 to the according power (for example 67,989,097 would be 6.7989097 times 10 to the seventh power). Unfortunatly however we were unable to get to a deminstration that involved fire.

Wednesday 9.1.10

Today during the first 30 minutes of class we finished our measurement lab by measuring five objects three of which had to be a jumbo paper clip, a piece of paper (the long way), and your height. The other two were students choice. We measured these in centimeters. The next step of the lab was to weigh the objects. This had to be done in grams. You had to weigh a jumbo paper clip, a piece of paper, and two objects of your choice. The final step of the lab was to measure the temperature. You had to find the room temperature, and then you had to do two different measures by filling up a beaker of water and finding its temperature.

          For the next 20 minutes of class we learned about the significant figure rule. The significant figure rule has four parts. 1. Digits other than zero are always significant. 2. Zeros between non-zero digits are always significant. 3. Any final zero after a decimal point is significant. Zeros used solely for spacing the decimal point (place holders) are not significant. We then filled out a little piece of paper based on how many significant figures were in each of the measurements. 

          On Friday we will be having a quiz on measurements. There was not any homework for tonight.

Tuesday 8.31.10

Today in class we took a few minutes to label all the important things in the room like the fire exits and water showers. Then we identified some materials. We identified a beaker, flask, Bunsen burner, a ring stand and a funnel.  We also talked about different types of measurements. To start off we got a ruler with a filled in a line on top. We had to estimate the length to the closest we can. With that you only have one guess. That means when you find your measurement it is not exact so you estimate to a reasonable length. When trying to find the measurement of a graduated cylinder, you measure from the lower dip in the water. Then we split into lab groups and started working on measurements. We took measurements in different ways. We found the smallest reading device for each utensil. The most accurate was a 10 ml graduated cylinder. It has the smallest reading device so it is most accurate. Some reading devices were 25 ml for a 400 ml beaker, 10 ml for 100ml beaker. 1 ml for 100 graduated cylinder and .2 ml for 10 ml graduated cylinder, which is the most accurate. After that we take a buret clamp and place a 250 ml beaker under it so it will catch the liquid. Fill the buret with water then open the valve and see how much water drains. The unique this about a buret is that the measurement starts at 100 then drops to 0. The reason for this is so you can see how much water or liquid you dropped or took out. We then recorded how much water was emptied out to the nearest 10nth. Then you let the water drain for 3 seconds and you record how much water drained. That is when we started cleaning up. This lab will be continued…