Only HW this week -- finish designing problems for final exam (at least four)

Today in class, after the test, I explained an assignment where students (that means you!) go through all their notes and create at least four multiple choice problems. I asked that you divide the back of a notes sheet into four boxes, so that you have a grid in the background and so that each problem won't be too complicated or big.

Pick problems that you know you can do, on material that you enjoyed, or that you think might be a challenge to your classmates. Don't stop at just four; you can submit two or three pages (8-12 problems). Each problem of yours that I select to be on the final will win you extra credit applied toward your final exam grade.

If you have any questions, first ask your classmates; then, if they can't answer your questions, give me a call at the number provided on your syllabus.

You must have the problems completed and ready to turn in on Monday at the start of class -- so treat it like any other HW assignment.

Practice for test tomorrow...

Here are a few practice problems for the test tomorrow; the answers can be found by clicking on the link at the end of this post:

Use this TABLE to answer the questions:

1) What state of matter is lead in at 320 degrees C? What state of matter would it be in if its temperature increased by 250 degrees C?

2) What state of matter is manganese in at 1300 degrees C? Would its state change if its temperature decreased by 400 degrees?

3) Oxygen at -160 (negative 160) degrees Celsius is in what state? How about if it got 40 degrees C colder?

Use the four equations we've studied in class to answer the last two questions:

4) The specific heat of a substance is 1.45. If a 200-gram sample of the substance starts out at 12 degrees C and then gains 3000 J of energy, what temperature will it end up at?

5) An unknown mass of lead (Cg = 0.13) loses 1500 J of energy, and in the process its temperature goes down to 15 degrees C from 35 degrees C. What is the mass of this sample?

Once you've tried all five out, click HERE to check your work.

HW#25 -- Finish specific heat problems sheet!!!

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...

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.

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

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?

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.