IB Thermal

page 1

 

1. Heat energy will flow from a hot small steel block to a cold large copper block in contact with each other until
  • A. the blocks are at the same temperature
  • B. the blocks contain the same internal heat energy
  • C. the molecules in both blocks have the same momentum when they collide
  • D. the blocks have the same heat capacity
2. Absolute zero is
  • A. -273 K
  • B. 0 K
  • C. -100 K
  • D. 373 K
3. A temperature of 300 K is equivalent to
  • A. 573 0C
  • B. 27 0C
  • C. 373 0C
  • D. -27 0C
4. When steam at 1000C condenses and turns into water at 1000C :-
  • A. The internal energy has increased and thermal energy is released to the surroundings
  • B. The internal energy has remained constant and thermal energy is released to the surroundings
  • C. The internal energy has remained constant and thermal energy is transferred from the surroundings to the steam
  • D. The internal energy has decreased and thermal energy is released to the surroundings
5. When ice melts at 00C , bonds between molecules are weaker. This leads to
  • A. an increase in potential energy between the water molecules
  • B. a decrease in potential energy between the water molecules
  • C. an increase in the kinetic energy of the water molecules
  • D. a decrease in the kinetic energy of the water molecules

6. The mole is defined as:

  • A. The amount of substance with the same number of atoms/molecules as 12g of carbon-12
  • B. The amount of substance with the same number of atoms/molecules as 6g of carbon-12
  • C. The amount of substance with the same mass as 12g of carbon-12
  • D. The amount of substance with the same mass as 6g of carbon-12
7. Helium has a molecular mass of 4. In a sample of 1kg of helium there are
  • A. 400 moles
  • B. 250 moles
  • C. 0.4 moles
  • D. 0.25 moles
8. You are more likely to receive a serious burn from holding 1kg of steel at 800C than 1g of iron at 4000C because
  • A. steel has a higher specific heat capacity than iron
  • B. the molecules of steel have a higher kinetic energy
  • C. the steel has a higher internal energy than the iron
  • D. the temperature difference between steel and iron is large

9. Two metal blocks initially at room temperature are heated.

Block X Block Y
Mass  = m     Mass = 6m
Specific heat capacity = c      Specific heat capacity = c/2
Heat energy supplied = Q    Heat energy supplied = 24Q
   temperature increase = T Temperature increase = ?

 

 

Using data from the diagram, the temperature increase of block Y must be
  • A.8T
  • B.4T
  • C.2T
  • D. T/2

10. The thermal capacity of an object is defined as

  • A. the energy required to raise the object's temperature by 1k
  • B.the energy required to raise the temperature of 1kg by 1k
  • C. the temperature rise required to increase the object's thermal energy by 1J
  • D. the temperature rise required to increase the thermal energyof 1kg by 1J