1. Energy = mass x specific latent heat. If the specific latent heat of melting of water is 334 kJ/kg, how much energy is needed to melt 100 g of ice?
- 3.34 kJ
- 33.4 kJ
- 33,400 kJ
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2. Which statement about units is correct?
- Temperature is measured in J and energy in °C
- Temperature is measured in °C and energy in J
- Temperature is measured in °C and energy in K
- Temperature is measured in °C and energy in W
3. Which equation is correct?
- energy = mass x specific heat capacity x change in temperature
- energy = mass x specific heat capacity x temperature
- energy = mass x specific latent heat x temperature
4. As a solid melts:
- its temperature increases
- its temperature stays the same
- its temperature decreases
5. The specific heat capacity of water is 4181 J/kg/°C and that of lead is 128 J/kg/°C. This means:
- More energy is needed to heat water than is needed to heat the same mass of lead by the same amount
- More energy is needed to boil water than is needed to boil lead
- Lead melts at a low temperature