Announcements 1/26/11 Prayer Please do this “Quick Writing” assignment while you’re waiting for class to start: Ralph is confused because he knows that when you compress gases, they tend to heat up (think of a bicycle pump nozzle getting hotter as you force the gas from the pump to the tire). So, how are “isothermal” processes possible? How can you compress a gas without its temperature increasing?
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Announcements 1/26/11
Prayer Please do this “Quick Writing” assignment
while you’re waiting for class to start: Ralph is confused because he knows that when you compress gases, they tend to heat up (think of a bicycle pump nozzle getting hotter as you force the gas from the pump to the tire). So, how are “isothermal” processes possible? How can you compress a gas without its temperature increasing?
Demo
Constant volume change, aka “alcohol rocket”
Thought question
How will the temperature of the gas change during this process from A to B?
a. Increaseb. Decreasec. First increase, then
decreased. First decrease, then
increasee. Stay the same
Reading quiz
What is “CV”?
a. heat capacity b. mass-pacityc. molar heat capacityd. molar heat capacity, but only for
constant volume changese. your “curriculum vitae”, a detailed
resumé
Thought question
Which will be larger, the molar heat capacity for constant volume changes or the molar heat capacity for constant pressure changes? (Hint: Think of the First Law.)
a. constant volumeb. constant pressurec. they are the samed. it depends on the temperature