Test #2 scores -- and, HW#8

Greetings students!

Use the links below to look up how you did on the most recent test, Test #2:
1stPeriod
3rdPeriod
5thPeriod
9thPeriod
We took this test using the computers last Thursday (Oct. 17th), and it had four parts -- Identifying the phase of a sample (S-L-G); Converting temperatures; Heat vs. temp vs. chemical vs. physical changes; and Calculations using specific heat. As usual, you have two weeks from today to meet with me after school, to study over and practice the needed skills, and to retake any sections that you were not happy with your grade on.

Now, here is the weekly homework assignment: (AGAIN, ITS ONLY ONE...)

FOR PHYSICS:

1) Using complete sentences, write out three real-world examples of speed. Your answers have to be sensible; here is an example of an answer that is real AND realistic: "A pitcher throws a baseball 90 miles per hour." (you cannot use the example as one of your responses)

2) Using complete sentences, write out three real-world examples of forces.

3) Using complete sentences, write out three real-world examples of things accelerating. You can use any form of the action -- "accelerates," "accelerating," "acceleration," etc. -- just make sure you use it correctly!

You can use your notes, flashcards or web definitions for these words if you are having trouble remembering what they mean... you can also use the web to look up the examples that you list!!!

FOR CHEMISTRY:

First, complete the worksheet we started in class (Finding symbol, # of protons, # of electrons, etc.). Here's a link to a colorful periodic table if you don't have yours with you. Then, answer these five critical-thinking questions about a sample of metal:

Pretend that you have a 10 kilogram sample of the liquid metal mercury (atomic symbol "Hg"). Assume it's in a big jar. Answer each part:

1) Based on the periodic table, how many protons, neutrons and electrons would a typical atom in your sample have?

2) What would be the atomic mass of a single Hg atom, if we crammed twenty more neutrons in the nucleus? (Hint: a single neutron weighs 1 AMU)

3) What might happen to the mass of the entire sample (started out weighing 10 kilograms) if we did this to ALL the atoms in the whole sample?

4) Adding two protons to the nucleus of Hg makes two changes to the atom -- one obvious and the other quite remarkable. How would the atomic mass change? What is the other, 'remarkable' change that occurs?

5) How would the appearance (and value) of your 1,000 gram sample of Hg change if you could remove exactly one proton from every atom in the sample?