Solids, Liquids, and Gases
Which state of matter can be compressed?
Gas
What is the name of the phase change that occurs from a gas to a liquid?
Condensation
Is freezing endothermic or exothermic?
Exothermic
On graph 2, which section contains a liquid?
B
Why can a paper clip float on the surface of water?
The surface tension is strong enough to support the weight of the paper clip.
Which state of matter is the most rigid?
Solid
What happens to the kinetic energy/speed of molecules as they get colder?
The kinetic energy/speed decreases.
Is evaporation endothermic or exothermic?
Endothermic
On graph 2, which section contains the molecules with the greatest kinetic energy?
A
What is the name of the special attractive forces for surface tension?
Cohesion
Which state of matter does surface tension occur with?
Liquid
Why does temperature not increase during a phase change?
Heat is being used to break attractive forces.
Is condensation endothermic or exothermic?
Exothermic
On graph 1, which section represents the boiling phase change?
D
Are gases more common when pressure is high or low?
Low
Which state of matter has the most kinetic energy?
Gas
Water has a boiling point of 100oC and ethanol has a boiling point of 78oC. Which has stronger attractive forces?
Water
You touch a cold pack and your hand gets colder. Is the cold pack going through an endothermic or exothermic process?
According to graph 1, which phase change represents the greatest overall energy increase for the substance?
Liquid to gas
Why does ice float in water?
Ice is less dense than water.