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
