SAT Thermal

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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.