Leaving Cert Ireland · Physics

Heat and Gases

8 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 8 questions

  1. How much energy is needed to raise the temperature of 3 kg of water by 60 °C? (Specific heat capacity of water = 4200 J/kg °C)
  2. The specific latent heat of fusion of ice is 336 000 J/kg. How much energy is needed to melt 0.2 kg of ice at 0 °C?
  3. The specific latent heat of fusion of ice is 336 000 J/kg. How much energy is needed to melt 2 kg of ice at 0 °C?
  4. A fixed mass of gas at constant temperature has volume 6 cm at 300 kPa. The volume is reduced to 3 cm. What is the new pressure?
  5. A fixed mass of gas at constant temperature has volume 12 cm at 200 kPa. The volume is reduced to 6 cm. What is the new pressure?
  6. A sealed rigid container holds gas at 127 °C and 200 kPa. The gas is heated to 227 °C. What is the new pressure?
  7. A sealed rigid container holds gas at 27 °C and 100 kPa. The gas is heated to 327 °C. What is the new pressure?
  8. A sealed rigid container holds gas at 47 °C and 200 kPa. The gas is heated to 87 °C. What is the new pressure?

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