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