1. Quiz 9 What are the 5 state properties or variables?
Does saturated vapor pressure vary by temperature?
Why, in your own words, do solids have a volumetric expansion coefficient (β) that is about 100 times less than that of gases?

2. 10.
Quiz 8 Answers 8.
11. 5. 3. 9.
12. 1. 2. 6. 7. 4.

3. Announcements No computers this week Remedial work list out for term 1
Correct spellings of names on the list outside my office
End of term test in 1 or 2 weeks

4. Test on 18th or 25th? Test is over: Review Notes
Kinetic Theory of Gas
Phase Change
Thermometry
Review Notes
Review Homework solutions (Posted Outside Office)
Review Lectures (Computer Lab)
Do practice problems from Giancolli, A-Level physics workout and Student Physics Books in Library

5. Lab solution to questions i, ii, and iii
How much energy is lost to the environment, is it relatively adiabatic?
Yes and No is a correct answer
Most heat losses from calorimeter were about 1 x 103 Joules
1 BTU ~ 1 x 103 Joules
1 BTU about equals 1 match of heat energy
Is 1 match of heat loss significant to the phase change of ice?

6. ii) Does the mass of the copper vessel effect the results of the heat lost to the surroundings?
No, because he calorimeter is warmed to 65 C by the energy of the water that was above 65 C.
That is to say, the calorimeter parts was assumed to be in thermal equilibrium with the water by 65 C.
Heat flows very quickly (by conduction) through the copper vessel and is assumed to hold no heat.

7. ii) Does the mass of the copper vessel make a difference in an experiment to determine the mass of an ice cube?
Yes, because the start of the experiment (data collection) is when the ice block is placed in the calorimeter and the equation for solving a calorimeter involves the mass of the copper vessel.

8. Mid Term Homework Solutions
Who wants to come to the board and answer number 1?

9. Number 1
How many atoms are there in a 3.4 gram copper penny?

10. Number 2 What are the following temperatures on the Kelvin scale?
-459 °

11. Number 3
Which is larger, 1 °C or 1 °F?

12. Number 4
A helium balloon, assumed to be a perfect sphere, has a radius of cm. At room temperature (20 °C), its internal pressure is atm. Find the number of moles of helium in the balloon and the mass of helium needed to inflate the balloon to these values.
List the givens
Find the volume
Show the equation and solve for unknown algebraically
Insert the numbers and units
Cancel the units
Find the moles and mass

13. Number 5
What is the Vrms speeds of air molecules (O2 and N2) at a room temperature of (28 °C)? Hint, the speed of O2 is different than that of N2.
List the givens
Look up the values
Show the equation and solve for unknown algebraically
Insert the numbers and units
Cancel the units
Find the solution

14. Number 6
A gas can transmit only those sound waves whose wavelength is long compared with the mean free path. Can you explain this? Where might this limitation arise?
What do we know about sound?
What do we know about mean free path?
What do we know about compression or longitudinal waves?
How would sound be affected by a gas?
How would sound be affected by mean free path of a gas?