Question 1

The temperature at which a liquid freezes is

Accepted Answer

A) affected by foreign ions. 
B) the same temperature at which its solid form melts. 
C) both of these 
D) neither of these 
A) affected by foreign ions. 
B) the same temperature at which its solid form melts. 
C) both of these 
D) neither of these

Question 2

Compared with sea-level cooking, in cooking eggs by boiling in mountain regions you should boil the eggs

Accepted Answer

A) with a hotter flame. 
B) for a shorter time. 
C) for a longer time. 
D) all of the above 
E) none of the above 
A) with a hotter flame. 
B) for a shorter time. 
C) for a longer time. 
D) all of the above 
E) none of the above

Question 3

Compared to sea level, water in an open pot in the mountains boils at

Accepted Answer

A) a higher temperature. 
B) a lower temperature. 
C) the same temperature. 
D) none of the above 
A) a higher temperature. 
B) a lower temperature. 
C) the same temperature. 
D) none of the above

Question 4

Firefighters find that the temperature of burning material is best lowered when water is

Accepted Answer

A) used in small amounts. 
B) pointed away from the flames. 
C) sprayed as a fine mist. 
D) salted. 
A) used in small amounts. 
B) pointed away from the flames. 
C) sprayed as a fine mist. 
D) salted.

Question 5

A refrigerator

Accepted Answer

A) produces cold. 
B) causes internal energy to disappear. 
C) transfers internal energy from inside to outside. 
D) transfers heat into cold. 
E) none of the above 
A) produces cold. 
B) causes internal energy to disappear. 
C) transfers internal energy from inside to outside. 
D) transfers heat into cold. 
E) none of the above

Question 6

Morning dew on the grass is a result of

Accepted Answer

A) evaporation of water. 
B) the open-structured form of water crystals. 
C) air pressure on water vapor. 
D) slow-moving water molecules sticking to one another. 
A) evaporation of water. 
B) the open-structured form of water crystals. 
C) air pressure on water vapor. 
D) slow-moving water molecules sticking to one another.

Question 7

When ice crystals form in clouds, the surrounding air

Accepted Answer

A) warms. 
B) cools. 
C) neither of these 
A) warms. 
B) cools. 
C) neither of these

Question 8

When water vapor changes phase to become water in a cloud, the surroundings become

Accepted Answer

A) cooler. 
B) warmer. 
C) both of these 
D) neither of these 
A) cooler. 
B) warmer. 
C) both of these 
D) neither of these

Question 9

The molecules in a room-temperature glass of water jostle around at

Accepted Answer

A) a great variety of speeds. 
B) much the same rates of speed. 
C) a very small range of speeds. 
A) a great variety of speeds. 
B) much the same rates of speed. 
C) a very small range of speeds.

Question 10

Which involves a larger number of calories?

Accepted Answer

A) the condensation of 1 gram of steam at 100°C to water at 100°C 
B) the cooling of 1 gram of water at 100 degrees Celsius to 1 gram of ice at absolute zero 
C) both the same 
D) none of these 
A) the condensation of 1 gram of steam at 100°C to water at 100°C 
B) the cooling of 1 gram of water at 100 degrees Celsius to 1 gram of ice at absolute zero 
C) both the same 
D) none of these

Question 11

The addition of salt to water affects its

Accepted Answer

A) crystal composition. 
B) freezing point. 
C) viscosity. 
D) liquidity. 
E) none of the above 
A) crystal composition. 
B) freezing point. 
C) viscosity. 
D) liquidity. 
E) none of the above

Question 12

The calories needed to change 10 grams of ice at 0°C to steam at 100°C is

Accepted Answer

A) 6200. 
B) 6400. 
C) 7200. 
D) 8000. 
E) none of the above 
A) 6200. 
B) 6400. 
C) 7200. 
D) 8000. 
E) none of the above

Question 13

Ice is put in a cooler to cool the contents. To speed up the cooling process, the ice can be

Accepted Answer

A) wrapped in newspaper. 
B) drained of water periodically. 
C) kept away from the food. 
D) broken into smaller pieces. 
E) none of the above 
A) wrapped in newspaper. 
B) drained of water periodically. 
C) kept away from the food. 
D) broken into smaller pieces. 
E) none of the above

Question 14

The surface of hot water has a relatively high rate of

Accepted Answer

A) evaporation. 
B) condensation. 
C) conductivity. 
D) convection. 
A) evaporation. 
B) condensation. 
C) conductivity. 
D) convection.

Question 15

When a geyser erupts, pressure at its bottom

Accepted Answer

A) increases. 
B) decreases. 
C) is unaffected 
D) all of the above 
E) none of the above 
A) increases. 
B) decreases. 
C) is unaffected 
D) all of the above 
E) none of the above

Question 16

To turn 50 grams of boiling water to steam requires

Accepted Answer

A) 50 calories. 
B) 500 calories 
C) 540 calories. 
D) more than 540 calories. 
E) none of the above 
A) 50 calories. 
B) 500 calories 
C) 540 calories. 
D) more than 540 calories. 
E) none of the above

Question 17

Water in a car radiator sometimes boils explosively when the radiator cap is removed, which is due to sudden

Accepted Answer

A) rapid evaporation. 
B) reduced pressure. 
C) excess condensation. 
D) excess vaporization. 
A) rapid evaporation. 
B) reduced pressure. 
C) excess condensation. 
D) excess vaporization.

Question 18

Water can be turned to ice by

Accepted Answer

A) lowering the surrounding air pressure. 
B) extracting energy. 
C) both of these 
D) neither of these 
A) lowering the surrounding air pressure. 
B) extracting energy. 
C) both of these 
D) neither of these

Question 19

A good cook knows that the temperature of violently boiling water is

Accepted Answer

A) higher than that of simmering water. 
B) the same as that of simmering water. 
C) actually lower than 100°C. 
D) neither of the above 
A) higher than that of simmering water. 
B) the same as that of simmering water. 
C) actually lower than 100°C. 
D) neither of the above

Question 20

Hydrothermal vents deep beneath the ocean surface attain temperatures far above 100°C due to

Accepted Answer

A) higher salt content. 
B) reduced salt content. 
C) greater pressure. 
D) all of the above 
E) none of the above 
A) higher salt content. 
B) reduced salt content. 
C) greater pressure. 
D) all of the above 
E) none of the above

Exam 17: Change of Phase

The temperature at which a liquid freezes is

Compared with sea-level cooking, in cooking eggs by boiling in mountain regions you should boil the eggs

Compared to sea level, water in an open pot in the mountains boils at

Firefighters find that the temperature of burning material is best lowered when water is

A refrigerator

Morning dew on the grass is a result of

When ice crystals form in clouds, the surrounding air

When water vapor changes phase to become water in a cloud, the surroundings become

The molecules in a room-temperature glass of water jostle around at

Which involves a larger number of calories?

The addition of salt to water affects its

The calories needed to change 10 grams of ice at 0°C to steam at 100°C is

Ice is put in a cooler to cool the contents. To speed up the cooling process, the ice can be

The surface of hot water has a relatively high rate of

When a geyser erupts, pressure at its bottom

To turn 50 grams of boiling water to steam requires

Water in a car radiator sometimes boils explosively when the radiator cap is removed, which is due to sudden

Water can be turned to ice by

A good cook knows that the temperature of violently boiling water is

Hydrothermal vents deep beneath the ocean surface attain temperatures far above 100°C due to

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