chapter 23 physics test

the number of calories released when 1 gram of 100 C steam cools to become

720 calories

to say that evaporation is a cooling process means that when evaporation occurs,

the remains liquid cools

pigs roll in the mud

to keep their skin wet so evaporation can occur

in order to walk barefoot on hot coals without harming your feet, less energy would get to your feet if your feet were

wet

which will melt a bigger hole in a block pf ice; a red hot nail tossed on it or a red hot piece of wood of the same mass as the temperature

wood

which would burn the most? 100g of water at 100 degrees C 100g of steam at 100 degrees C Both would be equally damaging

100g of steam at 100 degrees C

an air sample contains 25% of the amount of water vapor it is capable of holding. the air's relative humidity is

25%

the energy needed to turn 50 grams of 100 C boiling water to 100 C steam is

50 x 540 calories

how much energy is released when 1 gram of steam condenses to water at 100 degrees C?

540 calories

evaporation is a cooling process and condensation is

a warming process

food cooked in boiling water in the mountains cooks more slowly than when cooked at sea level. if the temperature under the pot is increased, the food will cook

at the same rate as before

if you want to cook boiled eggs while in the mountains, you should

boil the eggs for a longer time

when snow forms, the air become warmer because

changing from a vapor to a solid is a process that gives off energy

the surface of the earth is ordinarily warmer on a night that is

cloudy

melting snow

cools the surrounding air

ice is put in a cooler to cool the food stored there. in order to speed up the cooling process, you should

crush the ice

cindensation occurs when matter changes from a

gas to liquid

when water freezes, it

gives off energy

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

has more energy per kilogram than boiling water

as atmospheric pressure increases, the boiling temperature of a liquid

increases

at high altitudes, the boiling point of water

is lower

a liquid boils when

it turns to vapor at the bottom of or in the liquid

when boiling water in the mountains, the time needed to reach the boiling point is

less than at sea level

evaporation takes place when matter changes from a

liquid to a gas

freezing occurs when matter changes from a

liquid to a solid

the energy needed to melt 50 grams of 0 C to ice is

none of the above (not 50 calories or 5000 calories)

the reason pressure cookers cook food faster is that they

raise the cooking temperature of the food

clouds form when warm air

rises, expands, and chills

when water vapor condenses on the inside of a window, the window becomes

slightly warmer

morning dew on the grass is a result of

slow-moving molecules condensing on the grass

when heat is added to boiling water, the temperature of the boiling water

stays the same

on a humid day, water condenses on the outside of a glass office water. this phenomenon occurs mainly because of

the saturation pf cooler air

on which day will the amount of water vapor in the air be greater, a summer day at 100% humidity or a winter day at 100% humidity?

the summer day

the cooling effect inside a refrigerator is produced by

vaporizing the refrigeration liquid

when snow forms in clouds, the surrounding air

warms