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