When a solid turns into a liquid it is called ________.
Boiling
Melting
Freezing
There are only two elements with a liquid standard state. What are they?
Mercury and Bromine
Mercury and Uranium
Gold and Bromine
When a liquid is heated, it eventually reaches a temperature at which the vapor pressure is large enough that bubbles form inside the body of the liquid. This temperature is called the ___________ point.
Freezing
Melting
Boiling
The normal boiling point of water is ______.
10°C
100°C*
100°C
Measurements of the melting point of a solid can also provide information about the _________ of the substance.
Purity
Temperature
Weight
A liquid can become supercooled because the particles in a solid are packed in a regular structure that is characteristic of that particular substance.
True
False
Pressure cookers are equipped with a valve that lets gas escape when the pressure inside the pot exceeds some __________ value.
Increased
Decreased
Fixed
At 10,000 feet above sea level, the pressure of the atmosphere is only _______ mmHg.
526
500
498
Water boils when its vapor pressure is 526 mmHg, which occurs at a temperature of ______.
90°C
100°C
101°C
Liquids boil when their vapor pressure is _________ to the pressure exerted on the liquid by its surroundings.
Higher
Equal
Lower
Liquids have a characteristic temperature at which they turn into solids, known as their __________ point.
Melting
Boiling
Freezing
The freezing point of pure water at standard atmospheric pressure is ________.
0°C
90°C
100°C
The melting point of a solid and the freezing point of the liquid are different.
True
False
Substances can be cooled below their freezing points without the formation of a solid. Such liquids are known as __________ liquids.
Amorphous
Pure
Supercooled
At sea level, it is the pressure of ________ that causes water to boil at 100°C.
Air
Water
Heat
A compound’s melting point is determined by the force of _________ between molecules and symmetry.
Gravitation
Attraction
Distance
A molecule’s boiling point is based on its ________.
Mass
Atomic number
Structure
A liquid at higher pressure has a higher boiling point than when the atmospheric pressure of that liquid is lower.
True
False
The air pressure in an open system is most definitely the atmosphere on ________.
Gas
Earth
Liquid
Ethers have a lower boiling point than alkanes.
True
False
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