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Chapter 21: Temperature, Heat, and Expansion Questions
Chapter 21: Temperature, Heat, and Expansion Questions
16
Physics
01/03/2012

Term
 What is temperature?
Definition
 How hot or cold something is to a standard
Term
 What does matter tend to do when its temperature increases?
Definition
 It expands
Term
 How does a thermometer work?
Definition
 The liquid expands or contracts with added or lost Kinetic Energy
Term
 Using Celsius and Fahrenheit scales. Which is more precise when temperatures are expressed to the nearest whole number?
Definition
 Fahrenheit. Fahrenheit scale has 180 divisions between water freezing & boiling. The smaller degrees allow more precise reading.
Term
 To what Energy is Temperature closely related?
Definition
 Kinetic-movement of particles
Term
 Does matter contain heat?
Definition
 No. Heat is energy in motion from one object to a cold object
Term
 Define heat in terms of energy.
Definition
 Kinetic energy transferred from a hot object to a cold object is called heat
Term
 Define thermal contact.
Definition
 When heat flows from one hot object to a cold object that its is touching
Term
 Define thermal equilibrium.
Definition
 Objects in thermal contact reach the same temperature.
Term
 Define internal energy.
Definition
 Addition of all the energies in a substance. (Rotational kinetic energy, potential energy, translational kinetic energy)
Term
 Does a substance contain heat or internal energy?
Definition
 Internal energy
Term
 Define calorie.
Definition
 Amount of heat needed to raise 1 g of water 1 degree C.
Term
 Define kilocalorie.
Definition
 1 kilocalorie = 1000 calories
Term
 Generally, does all the energy absorbed by a substance raise its temperature?
Definition
 No, only increased translational KE increases temperature. Absorbed energy may: (1) increase rotation of molecules(2) increase internal vibration(3) stretch intermolecular bonds
Term
 What has more specific heat capacity, water or iron?
Definition
 Water. Explanation: Iron responds to an increased KE with translational motion. Water responds to an increased KE with rotational motion, internal vibrations and bond stretching.
Term
 What does a thermostat use to turn on and off heating and cooling devices?
Definition
 Bimetallic strips or coils
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