The specific heat problems sheet was supposed to be due today, but because I didn't give good enough notice that it was the HW assignment, I gave time in class today to finish it. I won't be seeing you guys again until Thursday due to the juniors testing, so you will need to bring that worksheet in COMPLETED on Thursday so we can grade it. Remember that the second half of Thursday's lesson will be the test on solid-liquid-gas transitions and on specific heat problems.
Also, today I gave a one-day extension on the "substance adventure" story. Basically, you have all of this evening and tonight to write a better paper and email it to me. If you were already happy with the paper you had sent me last week, then you don't need to send me an edited version; I'll simply grade the one I already have from you. Any paper not in my inbox tomorrow morning when I get up (aka, about 6 AM) will not be graded and you will receive a "missing" grade for it.
If you want more details about the "substance adventure" writing assignment, read back a few posts for my example story and the instructions...
A site to communicate HW and other information to the Wildcats who are learning chemistry with Mr. Mikulski!
Monday, April 23, 2012
Friday, April 20, 2012
HW for this week... finish problem sheet!
There is a worksheet with ten specific heat capacity' related problems on it that you received in class. If you somehow didn't ge tit, you can find it [HERE]. We've worked on it in class one day and most of you have had a second day to work on it. Since I have not assigned any other homework this week, I am assigning the completion of these ten problems as HW.
As usual, we will check the worksheet as homework (meaning, we'll go over the solutions and you'll have the opportunity to grade your work) on Monday. Recall that the four equations were:
Energy: q = m * Cg * (Tf - Ti)
mass: m = q / (Cg * [Tf - Ti])
specific heat capacity: Cg = q / (m * [Tf-Ti])
final temperature: Tf = q / (m * Cg) + Ti
For each of the ten problems, you will need to select the correct equation to use, and then plug in all the known quantities to solve the problems. Be sure when you are getting your final answer, to simplify what is inside parentheses and what is at the bottom of a fraction FIRST, before doing other calculations.
As usual, we will check the worksheet as homework (meaning, we'll go over the solutions and you'll have the opportunity to grade your work) on Monday. Recall that the four equations were:
Energy: q = m * Cg * (Tf - Ti)
mass: m = q / (Cg * [Tf - Ti])
specific heat capacity: Cg = q / (m * [Tf-Ti])
final temperature: Tf = q / (m * Cg) + Ti
For each of the ten problems, you will need to select the correct equation to use, and then plug in all the known quantities to solve the problems. Be sure when you are getting your final answer, to simplify what is inside parentheses and what is at the bottom of a fraction FIRST, before doing other calculations.
Thursday, April 12, 2012
HW#24c -- Friday, April 13th
The assignment for Friday is to finish your "Substance Adventure" essay and email it to me at sciencekidsveggies@yahoo.com
This is only if you have not already sent me the completed essay. If you send it to me completed before midnight on Friday, you can still get the maximum credit for it. If I receive it instead sometime on Saturday, it will have a late penalty, and if I receive it before next Monday at midnight, it will have an extra late penalty. After Monday, it will be too late to send it in.
These can help you finish it:
INSTRUCTIONS
SAMPLE ESSAY
This is only if you have not already sent me the completed essay. If you send it to me completed before midnight on Friday, you can still get the maximum credit for it. If I receive it instead sometime on Saturday, it will have a late penalty, and if I receive it before next Monday at midnight, it will have an extra late penalty. After Monday, it will be too late to send it in.
These can help you finish it:
INSTRUCTIONS
SAMPLE ESSAY
HW#24b -- Thursday, April 12th
The HW assignment for today is to read the page of text [HERE] and then write out and answer these questions:
1) According to the website, what are the five known states of matter (we only talked about the most common three in class)
2) As you DECREASE energy, how do the states of matter change? (ie, from what, to what next, to what next, etc.)
3) How does a chemical change differ from a physical change in a substance?
1) According to the website, what are the five known states of matter (we only talked about the most common three in class)
2) As you DECREASE energy, how do the states of matter change? (ie, from what, to what next, to what next, etc.)
3) How does a chemical change differ from a physical change in a substance?
Finishing stories that were left on a laptop... (instead of emailed)
Click [HERE] to browse for and find the file you left on a laptop yesterday.
Tuesday, April 10, 2012
HW#24a -- Tuesday, April 10th
Welcome back from spring break. This is the first of the assignments for this week's homework. Remember, these are about 20% of your grade, so it is important to take the time to practice the stuff we introduce in class at home.
For each problem below, use the table [HERE] to figure out what state (gas, liquid or solid) the sample started in, and what state it ended up in.
1) A sample of mercury starts out at 560 degrees K, and then cools down (ie, the temperature decreases) by 100 K.
2) A sample of ethyl alcohol starts out at 153 degrees K, and then it heats up (ie, the temperature increases) by 100K).
3) A sample of gold starts out at 300 degrees K (fridge temperature). Then, a chemist increases the temeprature by 1000 degrees K.
4) A sample of hydrogen starts out at 90 degrees K (colder than any temperature on earth), and then cools down even more to end up at 50 degrees K.
5) A sample of iron is in the earth's mantle (under the crust) where it is very hot -- 2,400 K. When a volcano spits out the sample onto Earth's surface, it cools down by 500 K.
6) A sample of oxygen starts out at 100 degrees K, and then its temperature is decreased to 60 degrees K.
7) A sample of nitrogen starts out at 100 degrees K, and then it is chilled down to 50 degrees K.
For each problem below, use the table [HERE] to figure out what state (gas, liquid or solid) the sample started in, and what state it ended up in.
1) A sample of mercury starts out at 560 degrees K, and then cools down (ie, the temperature decreases) by 100 K.
2) A sample of ethyl alcohol starts out at 153 degrees K, and then it heats up (ie, the temperature increases) by 100K).
3) A sample of gold starts out at 300 degrees K (fridge temperature). Then, a chemist increases the temeprature by 1000 degrees K.
4) A sample of hydrogen starts out at 90 degrees K (colder than any temperature on earth), and then cools down even more to end up at 50 degrees K.
5) A sample of iron is in the earth's mantle (under the crust) where it is very hot -- 2,400 K. When a volcano spits out the sample onto Earth's surface, it cools down by 500 K.
6) A sample of oxygen starts out at 100 degrees K, and then its temperature is decreased to 60 degrees K.
7) A sample of nitrogen starts out at 100 degrees K, and then it is chilled down to 50 degrees K.
Makeup HW assignment due Thursday, April 12th
If you were working on the makeup homework allowance I had set aside for during spring break, the last day to turn it in to the box in my room is this Thursday.
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