Specific Heat Capacity (Concept)

Calculate the amount of heat required to raise the temperature of 0.8kg of copper from 35 degree Celsius to 60 degree Celsius ( specific heat capacity of copper =400 Jkg^-1C^-1)

• 6kJ

• 8kJ

• 11.2 kJ
  

• 12 kJ
  

Iron has a higher specific heat capacity than copper. When heat is supplied at the same rate to two identical blocks of iron and copper, which of the following will take place?

• The iron block melts earlier than the copper block

• The iron block will expand more than the copper block

• The temperature rise in the iron block is faster than the copper block

• The temperature rise in the iron block is slower than the copper block.

Each of the following blocks has the same mass. Same amount of energy is supplied to each block by an immersion heater. Which of the blocks will show the smallest temperature rise?

• Lead (specific heat capacity =130 Jkg^-1C^-1)

• Iron (specific heat capacity =450 Jkg^-1C^-1)

• Copper (specific heat capacity =390 Jkg^-1C^-1)

• Aluminium (specific heat capacity =900 Jkg^-1C^-1)

Heat energy is supplied at the same rate to 250g of water and 250g of ethanol. The temperature of the ethanol rises faster. This is because the ethanol.

• is denser than water

• is less dense than water

• has a larger specific heat capacity than water

• has a smaller specific heat capacity than water

The specific heat capacities of lead and benzene are 130Jkg^-1C^-1 and 1750Jkg^-1C^-1 respectively. If the same amount of heat is supplied to the same amount of each liquid, which of the following statements is true ?

• The rise in temperature of lead is larger than that in benzene

• Both liquids show an equal rise in temperature

• The rise in temperature of lead is smaller than that in benzene

• The ratio of rise in temperature for a lead to that benzene is 13:175

An electric kettle is rated at 800W. Calculate the rise in temperature of 2.5kg of water if the electric kettle is switced on for 5 minutes. (Specific heat capacity of water= 4200Jkg^-1C^-1)

• 18.9 C
  

• 22.9 C
  

• 25.9 C
  

• 32.9C