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BECE (Ghana) Gas Pressure — practice questions

Explore 2 free Gas Pressure questions in BECE (Ghana) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Gas Pressure questions and exercises with answers

Showing questions 1–2 of 2.

What causes the pressure of a gas inside a closed container?Read the answer and worked solution →A sealed tin of air is left in hot sunshine. The tin does not change size. What happens to the pressure inside?Read the answer and worked solution →

Worked practice questions

What causes the pressure of a gas inside a closed container?

  1. Particles hitting the container walls
  2. Particles sticking to each other firmly
  3. Particles losing mass as they move
  4. Particles melting against the walls
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Correct answer: A. Particles hitting the container walls

1. Gas particles move very fast and in every direction. 2. They keep bumping against each other and against the inside of the container. 3. The force of all those bumps on the walls is what we call gas pressure. 4. More particles inside means more bumps, so the pressure is higher. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), What is gas pressure?_

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A sealed tin of air is left in hot sunshine. The tin does not change size. What happens to the pressure inside?

  1. The pressure falls
  2. The pressure rises
  3. The pressure halves
  4. The pressure vanishes
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Correct answer: B. The pressure rises

1. Sunshine heats the air inside the tin, giving its particles more energy. 2. Particles with more energy move faster than before. 3. Faster particles hit the walls of the tin more often and with more force. 4. More frequent and harder hits mean a higher pressure. 5. The tin does not change size, so the particles have no extra room to spread into. 6. The pressure therefore rises rather than falls or halves. 7. It cannot vanish, because the particles keep moving as long as the gas is there. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), How does heating or cooling a gas change its pressure?_

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