Exam 17: Change of Phase

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

Suppose you walk on red-hot coals with bare feet.If bits of the coals do not stick to your feet,it would be best if your feet are

A substance can be sprayed on crops to prevent frost formation under many conditions.If frost did not form on the fields and woods of an entire continent,cold nights would be

Which could burn a boy scout the most?

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

A factor that usually determines whether a substance is in the solid,liquid,gaseous,or plasma state is its

Evaporation is a cooling process because

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

The cooling effect inside a refrigerator is produced by

Use the following figure to answer the question: -Food in a pressure cooker is cooked faster because of the

To turn 50 grams of boiling water to steam requires

When heat is added to boiling water,its temperature

When a block of ice at zero degrees Celsius melts,the ice

On a humid day,water condenses on the outside of a glass of ice water.This phenomenon occurs mainly because of

We feel uncomfortably warm on a muggy day because water molecules are

When a gas is changed to a liquid state,the gas

We are warmed by condensation because water molecules in the air that strike our bodies

Morning dew on the grass is a result of

Use the following figure to answer the question: -Food cooked in boiling water at a mountain top cooks slower than when cooked at sea level.If the temperature under the pot of boiling water is increased,the food will cook

The operation of a geyser,such as Old Faithful in Yellowstone Park,is most like the operation of a