#1
Which of the following best describes the concept of energy?
The ability to do work or produce heat
The amount of matter in an object
The force acting on an object
The speed of an object in motion
#2
What is the primary source of energy for the Earth?
Geothermal energy
Wind energy
Solar energy
Nuclear energy
#3
What happens to the temperature of a substance during a phase change?
It increases
It decreases
It remains constant
It fluctuates randomly
#4
Which of the following best describes the process of melting?
Solid to liquid
Liquid to gas
Gas to liquid
Liquid to solid
#5
At what temperature does water boil at standard atmospheric pressure?
#6
During which phase change does a substance absorb energy?
Melting
Freezing
Condensation
Sublimation
#7
Which of the following is true about the conservation of energy principle?
Energy can be created but not destroyed
Energy can be destroyed but not created
Energy cannot be created or destroyed, only transformed
Energy is always lost as heat during transformations
#8
Which law of thermodynamics states that energy cannot be created or destroyed, only transformed?
First law
Second law
Third law
Zeroth law
#9
What is the process by which a gas changes directly into a solid?
Condensation
Deposition
Sublimation
Evaporation
#10
What is the term used to describe the energy required to raise the temperature of a substance without changing its phase?
Latent heat
Sensible heat
Specific heat
Thermal energy
#11
What is the critical point of a substance?
The temperature at which a solid changes to a liquid
The temperature at which a liquid changes to a gas
The temperature and pressure at which distinct liquid and gas phases cease to exist
The temperature and pressure at which all phases coexist
#12
Which phase change requires the greatest amount of energy to occur?
Evaporation
Condensation
Freezing
Sublimation
#13
What is the term for the energy required to change a substance from a liquid to a gas at constant temperature?
Heat of fusion
Heat of vaporization
Specific heat
Latent heat
#14
At what point does a substance exist in equilibrium between its solid, liquid, and gas phases?
Triple point
Critical point
Melting point
Boiling point
#15
Which of the following factors does NOT affect the rate of evaporation?
Surface area
Temperature
Pressure
Wind speed