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Unit 8 Heat Study Guide - answers
1. A change of state is a _c__
a. Process by which two states of matter co-exist
b. Chemical change
c. Physical change that converts a substance from one physical form to another
2. Particles in a ___solid_______ move slower than particles in a ____liquid or gas______.
3. Particles in a _a__ vibrate in place.
a. Solid
b. Liquid
c. Gas
4. Your bare feet cool on a cement floor due to _c___
a. Convection
b. Radiation
c. Conduction
5. __Radiation__________ is the transfer of energy through space.
6. _Convection___________ is the transfer of energy by the movement of a liquid or a gas
from one place to another.
7. The total kinetic energy of the particles that make up a substance is __a__.
a. Thermal energy
b. Temperature
c. Radiation
d. Thermal expansion
8. Particles in motion have _____kinetic____ energy.
9. Expansion_ _joints_ allow concrete segments on a bridge to expand to avoid cracking
on hot days.
10. Absolute zero is _d__.
a. 0⁰F
b. -273⁰C
c. 0K
d. B and C
11. An example of thermal expansion is _c_
a. Warm air rising
b. Sun warming your face
c. Alcohol in a thermometer rising
d. None of the above
12. _Kelvin____ is the official SI temperature scale.
13. Which of the following is not a physical change? _d___
a. Melting
b. Freezing
c. Boiling
d. Changing color
14. Answer the following question based on the graph below.
What is the boiling point of this substance? __a___
a. 100⁰C
b. 0⁰F
c. 273K
15. Examine the graph below and answer the question that follows.
Based on the above graph at what two temperatures are phase changes occurring? __b__
a. 32⁰F and 212⁰F
b. 0⁰C and 100⁰C
c. -20⁰C and 0⁰C
16. Why does average kinetic energy remain the same during a phase change of a
substance? _a___
a. Thermal energy is used to overcome attraction between particles.
b. Average kinetic energy does not stay the same
c. Thermal energy is used to make a chemical change
17. Water rises and falls in a boiling pot of water due to _b___.
a. Conduction
b. Convection
c. Radiation
d. Evaporation
18. The sun warming your face is an example of _a___.
a. Radiation
b. Conduction
c. Convection
d. Condensation
19. Burning your hand while touching a hot stove is an example of _b___.
a. Insulation
b. Conduction
c. Convection
d. Radiation
20. Heat is the _transfer__ of _energy___ between objects of _different__ temperatures.
21. If two different substances have the same temperature, then _d___
a. They have the same total kinetic energy
b. They have the same state of matter
c. Their specific heat is the same
d. None of the above
22. In which state does water have the highest average kinetic energy _c___?
a. Solid
b. Liquid
c. Gas
23. Gloves warm your hands because they are a (n) _a___.
a. Insulator
b. Conductor
c. UV ray absorber
d. They radiate heat
24. The lowest possible temperature is _0__K or _-273_⁰C.
25. The Atlantic Ocean has ___more__ thermal energy and _less__ average kinetic energy
than a cup of hot chocolate.