HW #9 -- PLEASE DO THE CORRECT SECTION!

For PHYSICS:

1) Draw a position vs. time graph showing a person walking to school, staying at school for a while, and then walking back home

2) Draw a speed vs. time graph showing a car accelerating from being stopped at a stop sign, and then a few seconds later braking and coming to a stop at another stop sign.

3) Draw the position vs. time graph for the situation in #2.

4) Draw the acceleration vs. time graph for a bowling ball pushed out of a plane at a height of 20,000 ft above the ground. Show the graph all the way to one second after the ball has hit the ground. BONUS if you can label your y-axis EXACTLY (HINT: acceleration due to gravity is a constant 10 m/s/s)

For CHEMISTRY:

Draw the complete Bohr model (with electron energy levels) for each. Then, say exactly what kind of ion the atom can form to undergo ionic bonding... (ex. -- "Na can become the positive ion Na2+"). hou can use the link to a periodic table in the HW#8 post if you need to use one and don't have yours...

1) Magnesium
2) Lithium
3) Phosphorus
4) Chlorine
5) Neon

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?

HW #7a -- the one and only homework assignment for this week!

Lucky students, you only have one HW assignment for this week. Examine each infrared picture below. For each picture, use the color scale to tell what temperature the two objects are. Then, make your best guess as to what temperature one of the objects will have in one hour's time (once heat heat has been lost/gained to the surrounding objects or the air)

1a) Temp of the windshield     1b) Temp of the leaking engine coolant    1c) Coolant temp one hour later?

                                                                (deg F)

 2a) Temp of the boy      2b) Temp of the basketball    2c) Temp of the boy one hour later?

                                                               (deg F)

3a) Temp of the caterpillar      3b) Temp of the hand    3c) Temp of the caterpillar one hour later?

 4a) Temp of the left hand      4b) Temp of the right hand    4c) Temp of both hands one hour later?

                                                               (deg F)

5a) Temp of the ice cube      5b) Temp of the surrounding air     5c) Temp of water (melted cube) 1 hr later?

                                                          (deg F)

6a) Temp of the hand      6b) Temp of the lizard    3c) Temp of the lizard, if held by the hand for one hour?

HW #6c

HW #6b

** Note that there are TWO questions here (part 1 and part 2, typed out below it...)

2)  Be careful when you heat your gasoline up... if you get it up to 230 degrees C, it won't just be a gas, it will actually ignite. And when it ignites, that is a chemical reaction -- not just a physical change. If you make it hot enough to ignite, then you can't keep telling a story about a sample of gasoline... why not? (Explain, using at least 2 complete sentences)

HW #6a

Use the chart here to answer the questions below:

HW #5b

HW #5a

Test #1 scores -- look yours up, see which parts you need to retake... ASAP

Only a week and a half remaining to retake any parts of Test #1 that you failed. Most of you know your student ID but if you don't, look it up first so you can find your score:

1st Period (Chem)
5th Period (Physics)
9th Period (Chem)

This test, being the only assessment we've had so far, is worth 50% of your grade. Next Friday, Oct. 11th, is the last day that you can possibly retake this test.

HW #4 (last week) -- Crossword finished + in your binder

Greetings students, last week there was no posted online HW problem sets. However, there was one assignment started in class that I asked you to finish on your own. The Heat + Temperature Crossword Puzzle needs to be completed and in your binder. As it was largely in-class practice, it is fair game for a future binder check... - Mr. M