Chapter 21 flashcards for physics

a container of water has its smallest volume at (-20 degrees C, 0 degrees C, 4 degrees C)

4 degrees C

temperature is related mostly to the

average molecular kinetic energy in a substance

the energy content of a piece of food is normally determined by

burning the food

heat is measured in

calories, kilocalories, and joules

which temperature scale labels the freezing point of water at 0 degrees

celsius

A bimetallic strip will bend when heated because

each metal expands at different rates

heat is the

energy transferred between objects because of a temperature difference

when water at 4 degrees C is heated, it expands. When water at 4 degrees C is cooled, it

expands

A bimetallic strip consists of two strips of the same material welded together

false

A temperature scale that has 100 degrees between the boiling point and the freezing point of water is the fahrenheit scale (T or F)

false

a calorie is a common unit of force (T or F)

false

gasses dont expand very much when heated

false

the total of all energies in a substance is its temperature (T or F)

false

some molecules are able to absorb large amounts of energy in the form of internal vibrations and rotations. Materials composed of such molecules would have

high specific heat heat capacities

the largest extremes in temperature are usually experienced

in the middle of a continent

when an iron ring is heated, the hole becomes

larger

if the specific heat capacity of water were higher than it is, lakes would be

less likely to freeze

the fact that desert sand is very hot in the day and very cold at night is evidence that sand has a

low specify heat capacity

specific heat capacity is related to the amount of internal energy

needed to change the temperature of one gram of a substance one degree

A piece of iron and a cup of water both have the same temperature. if they are heated so the internal energy of each doubles

the iron will have the higher temperature

which is tender, ice at 0 degrees C or water at 4 degrees C

the water

internal energy is the

total amount of energy contained in a object

heat is the energy that transfers from one object to another because of a temperature difference (T or F)

true

liquids usually expand when heated

true

the amount of heat required to change the temperature of a unit mass of a substance by 1 degree is its specific heat capacity (T or F)

true

the average genetic energy of molecules in a substance is related tot he temperature (T or F)

true

water contracts when heated from 0 degrees C to 4 degrees C

true

which has the highest specific heat capacity, water or sand?

water

which of the following expands most when the temperature is lowered? (iron, wood, helium, water at 4 degrees C, none of the above)

water at 4 degrees C

the reason fish live from year to year in ponds that freeze over in the winter is that

water below the ice is 4 degrees above freezing

during a very cold winter, water pipes sometimes burst. the reason for this is

water expands when freezing

the reason an ocean's temperature doesn't vary much from one season to the next is that

water has a high specific heat capacity

which, at the same temperature, will cool slower on a hot day?

watermelon

consider a gap between a metal ring, if the ring is heated, the gap becomes

wider