Physics Ch. 17

A boy scout will be burned more severely by

100g of stem at 100°C

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

A great variety of speeds

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

A lower temperature

Evaporation is a cooling process and condensation is

A warming process

How does the freezing point of a liquid compare with its melting point?

Both freezing point and melting point are the same for pure substance

Water can be brought to a boil by

Both of these (Reducing air pressure on its surface, and applying heat)

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

Broken into smaller pieces

When condensation occurs inside your bedroom window, the air outside is appreciably

Colder

Melting snow tends to

Cool the surrounding air

A canteen that is wet in the outside results in water inside that is

Cooler

When a geyser erupts, pressure at its bottom

Decreases

The surface of hot water has relatively high rate of

Evaporation

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

For a longer time

The addition of salt to water affects its

Freezing point

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

Greater pressure

The pressure at the bottom of a geyser is

Greater than nearer the top

What is the predominant gas is in a bubble of boiling water?

H2O

The temperature at which water freezes is the same as the temperature at which

Ice melts

Stored potatoes, beets, and rutabagas freeze at temperatures below zero degrees Celsius (rather than at exactly zero) because

The water in them contains dissolved salts and sugars

When steam condenses, the surrounding air is

Warmed

When water freezes, the surrounding air is

Warmed

When water vapor condenses on the inside of a window, the room becomes slightly

Warmer

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

Wet

Which involves a larger number of calories?

The condensation of 1 gram of steam at 100°C to water at 100°C

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

Large tubs of water

Foreign ions introduced to water

Lower the freezing point of water

Increased air pressure on the surface of hot water tends to

Prevent boiling

An inventor discovers a harmless and tasteless salt, which when added to water changes its boiling point. The market value for this salt will be better if the salt

Raises the boiling point of water

When fast moving water molecules collide, they tend to

Rebound without sticking

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

Reduced pressure

When a gas is changed to a liquid, the gas

Release energy

When liquids change to solids they

Release energy

When a vapor condenses, energy

Released from the vapor

What heat is added to boiling water, it temperature

Remains unchanged

Morning dew on the grass in a result of

Slow moving water molecules sticking to one another

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

Sprayed as a fine mist

When slow moving water molecules collide, they tend to

Stick

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

Temperature