SAT Thermal

page 1

 

1. When ice melts at 00C , bonds between the water molecules are weaker. This leads to

  • A. an increase in potential energy
  • B. a decrease in potential energy
  • C. an increase in the kinetic energy
  • D. a decrease in the kinetic energy
  • E. no changes to the potential or kinetic energy

2. When steam at 1000C condenses and turns into water at 1000C :-

  • A. The total internal energy has increased and thermal energy is released to the surroundings
  • B. The total internal energy has remained constant and thermal energy is released to the surroundings
  • C. The total internal energy has remained constant and thermal energy is transferred from the surroundings to the steam
  • D. The total internal energy has decreased and thermal energy is transferred from the surroundings to the steam
  • E. The total internal energy has decreased and thermal energy is released to the surroundings

3. The mole is defined as:

  • A. The amount of any substance with the same number of molecules or atoms as 12g of carbon-12
  • B. The amount of any substance with the same number of molecules or atoms as 6g of carbon-12
  • C. The number of molecules or atoms with the same relative molecular mass as carbon-12
  • D. The number of molecules or atoms with the same relative molecular mass as 6g of carbon -12
  • E. 12g of carbon-12

4.Two metal blocks initially at room temperature are heated. Using data from the diagram, the temperature increase of block Y must be

  • A.8T
  • B.4T
  • C.2T
  • D. T/2
  • E. T/4

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 = ?

The graphs below show the temperature change of five 1 kg samples of solid substances as they are heated and melt. In all cases heat energy is supplied at a constant rate.

Which substance has

5. The highest specific heat capacity when solid?

6. The lowest latent heat of fusion?
7. A lower specific heat capacity when solid than when liquid?

 

8. The equation of state for an ideal gas  is  PV= nRT. In this formula, ‘n’ is the

  • A. universal gas constant
  • B. number of molecules of gas
  • C. molar mass of the gas
  • D. number of litres of gas
  • E. number of moles of gas

9. A fixed mass of gas is trapped inside a cylinder of volume V at a temperature T and pressure P. The gas is compressed to a volume of V/8 and the temperature increases to 4T. The new pressure in the tank is

  • A. 32P
  • B. 8P
  • C. 2P
  • D. P/2
  • E. P/32

10. A piston at a pressure of 100kPa is allowed to expand slowly, the volume increasing by 0.01m 3. The work done by the gas is

  • A. +1KJ
  • B. -1KJ
  • C. +1000kJ
  • D. -1000kJ
  • E. no work is done by the gas.