Question 1

A boy scout will be burned more severely by

Accepted Answer

A) 100 g of water at 100°C. 
B) 100 g of steam at 100°C. 
C) both about equally 
D) neither of these 
A) 100 g of water at 100°C. 
B) 100 g of steam at 100°C. 
C) both about equally 
D) neither of these

Question 2

The mass of ice that can be melted by 1 gram of 100°C steam is (Hint: Don't forget about hot water remaining from condensed steam.)

Accepted Answer

A) 0.125 gram. 
B) 0.148 gram. 
C) 6.75 grams. 
D) 8 grams. 
E) none of the above 
A) 0.125 gram. 
B) 0.148 gram. 
C) 6.75 grams. 
D) 8 grams. 
E) none of the above

Question 3

When heat is added to boiling water, its temperature

Accepted Answer

A) increases. 
B) decreases. 
C) remains unchanged. 
D) none of the above 
A) increases. 
B) decreases. 
C) remains unchanged. 
D) none of the above

Question 4

Foreign ions introduced to water

Accepted Answer

A) lower the freezing point of water. 
B) raise the freezing point of water. 
C) do not affect water's freezing point. 
A) lower the freezing point of water. 
B) raise the freezing point of water. 
C) do not affect water's freezing point.

Question 5

When moth balls sublime to gas they

Accepted Answer

A) absorb energy. 
B) release energy. 
C) both of these 
D) neither of these 
A) absorb energy. 
B) release energy. 
C) both of these 
D) neither of these

Question 6

The most responsible factor for whether a substance takes the phase of solid, liquid, gas, or plasma is its

Accepted Answer

A) composition. 
B) atomic shell configuration. 
C) temperature. 
D) none of the above 
A) composition. 
B) atomic shell configuration. 
C) temperature. 
D) none of the above

Question 7

When steam condenses, the surrounding air is

Accepted Answer

A) cooled. 
B) warmed. 
C) both of these 
D) neither of these 
A) cooled. 
B) warmed. 
C) both of these 
D) neither of these

Question 8

To illustrate regelation with ice it is important that a

Accepted Answer

A) wire is used. 
B) string is used. 
C) either of these 
D) none of the above 
A) wire is used. 
B) string is used. 
C) either of these 
D) none of the above

Question 9

During snow fall, the surrounding air is

Accepted Answer

A) cooled. 
B) warmed. 
C) both of these 
D) neither of these 
A) cooled. 
B) warmed. 
C) both of these 
D) neither of these

Question 10

Rapid evaporation of hot water can lead to

Accepted Answer

A) superheated steam. 
B) the formation of ice. 
C) both of these 
D) neither of these 
A) superheated steam. 
B) the formation of ice. 
C) both of these 
D) neither of these

Question 11

Stored potatoes, beets, and rutabagas in an unheated well-insulated room can be protected from freezing by having in the room

Accepted Answer

A) blocks of foam plastic. 
B) large tubs of water. 
C) an ample supply of fire wood. 
D) none of the above 
A) blocks of foam plastic. 
B) large tubs of water. 
C) an ample supply of fire wood. 
D) none of the above

Question 12

A hot dog pants

Accepted Answer

A) to enable evaporation in its mouth and bronchial tract. 
B) to provide more oxygen into its lungs. 
C) to impress dogs of the opposite sex. 
D) none of the above 
A) to enable evaporation in its mouth and bronchial tract. 
B) to provide more oxygen into its lungs. 
C) to impress dogs of the opposite sex. 
D) none of the above

Question 13

To turn 1 gram of boiling water to steam requires

Accepted Answer

A) almost as much energy as changing 1 gram of 0°C water to the boiling point. 
B) as much as increasing 1 kilogram of 95°C water to the boiling point. 
C) more energy than needed to turn 1 gram of absolute-zero ice to the boiling point. 
D) none of the above 
A) almost as much energy as changing 1 gram of 0°C water to the boiling point. 
B) as much as increasing 1 kilogram of 95°C water to the boiling point. 
C) more energy than needed to turn 1 gram of absolute-zero ice to the boiling point. 
D) none of the above

Question 14

When you blow over hot soup to cool it you are helping

Accepted Answer

A) to slightly increase air pressure atop the soup surface. 
B) more energetic particles in the soup to escape. 
C) conduction, convection, and radiation. 
D) none of the above 
A) to slightly increase air pressure atop the soup surface. 
B) more energetic particles in the soup to escape. 
C) conduction, convection, and radiation. 
D) none of the above

Question 15

When slow-moving water molecules collide they tend to

Accepted Answer

A) rebound without sticking. 
B) stick. 
C) both of these 
D) neither of these 
A) rebound without sticking. 
B) stick. 
C) both of these 
D) neither of these

Question 16

To increase the temperature of 50 grams of water by 2 Celsius degrees requires

Accepted Answer

A) 0.04 calorie. 
B) 2 calories. 
C) 4.19 calories. 
D) 25 calories. 
E) 100 calories. 
A) 0.04 calorie. 
B) 2 calories. 
C) 4.19 calories. 
D) 25 calories. 
E) 100 calories.

Question 17

Increased air pressure on the surface of hot water tends to

Accepted Answer

A) prevent boiling. 
B) promote boiling. 
C) both of these 
D) neither of these 
A) prevent boiling. 
B) promote boiling. 
C) both of these 
D) neither of these

Question 18

If bits of the coals do not stick to your feet while walking barefoot on red-hot coals, it would be best if your feet are

Accepted Answer

A) wet. 
B) dry. 
C) warm. 
D) cold. 
E) very hot. 
A) wet. 
B) dry. 
C) warm. 
D) cold. 
E) very hot.

Question 19

In mountain regions, food cooked in boiling water cooks slower than when cooked at sea level. If the temperature beneath the pot of boiling water is increased, the food will cook

Accepted Answer

A) faster. 
B) slower still. 
C) both of these 
D) neither of these 
A) faster. 
B) slower still. 
C) both of these 
D) neither of these

Question 20

Steam burns are more damaging than burns caused by boiling water because steam

Accepted Answer

A) has more energy per gram than boiling water. 
B) releases additional energy when it condenses. 
C) both of these 
D) neither of these 
A) has more energy per gram than boiling water. 
B) releases additional energy when it condenses. 
C) both of these 
D) neither of these

Exam 17: Change of Phase

A boy scout will be burned more severely by

The mass of ice that can be melted by 1 gram of 100°C steam is (Hint: Don't forget about hot water remaining from condensed steam.)

When heat is added to boiling water, its temperature

Foreign ions introduced to water

When moth balls sublime to gas they

The most responsible factor for whether a substance takes the phase of solid, liquid, gas, or plasma is its

When steam condenses, the surrounding air is

To illustrate regelation with ice it is important that a

During snow fall, the surrounding air is

Rapid evaporation of hot water can lead to

Stored potatoes, beets, and rutabagas in an unheated well-insulated room can be protected from freezing by having in the room

A hot dog pants

To turn 1 gram of boiling water to steam requires

When you blow over hot soup to cool it you are helping

When slow-moving water molecules collide they tend to

To increase the temperature of 50 grams of water by 2 Celsius degrees requires

Increased air pressure on the surface of hot water tends to

If bits of the coals do not stick to your feet while walking barefoot on red-hot coals, it would be best if your feet are

In mountain regions, food cooked in boiling water cooks slower than when cooked at sea level. If the temperature beneath the pot of boiling water is increased, the food will cook

Steam burns are more damaging than burns caused by boiling water because steam

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