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BECE (Ghana) Particle Model of Matter — practice questions

Explore 3 free Particle Model of Matter questions in BECE (Ghana) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Particle Model of Matter questions and exercises with answers

Showing questions 1–3 of 3.

Why does a block of solid keep its own shape instead of flowing?Read the answer and worked solution →Why can a gas be squeezed into a smaller space when a liquid cannot?Read the answer and worked solution →What is the spreading of particles from a crowded area to a less crowded area called?Read the answer and worked solution →

Worked practice questions

Why does a block of solid keep its own shape instead of flowing?

  1. Its particles sit in fixed positions
  2. Its particles have no mass at all
  3. Its particles are all the same size
  4. Its particles float freely apart
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Correct answer: A. Its particles sit in fixed positions

1. In a solid the particles are packed closely in a regular arrangement. 2. Strong forces lock each particle into a fixed position. 3. Because the particles cannot change places, the solid keeps a fixed shape. 4. Particles that floated freely apart would describe a gas instead. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), The solid state_

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Why can a gas be squeezed into a smaller space when a liquid cannot?

  1. Its particles are much lighter than liquid ones
  2. Its particles have large gaps between them
  3. Its particles lose energy as they are pushed
  4. Its particles are far smaller than liquid ones
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Correct answer: B. Its particles have large gaps between them

1. Whether a substance can be squeezed depends on the space between its particles. 2. Gas particles are spread far apart with large empty spaces between them. 3. Squeezing a gas simply pushes those particles closer together. 4. That is how a diver carries an hour of air inside one small tank. 5. In a liquid the particles are already close, so there is almost no room left. 6. A liquid is therefore very hard to compress. 7. The particles themselves never shrink or grow, so the option about size is wrong. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), The gaseous state_

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What is the spreading of particles from a crowded area to a less crowded area called?

  1. Expansion
  2. Reflection
  3. Diffusion
  4. Refraction
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Correct answer: C. Diffusion

1. Particles in liquids and gases keep moving in unpredictable directions. 2. This random movement carries them from where they are crowded to where they are not. 3. Spreading out in this way is called diffusion, and it is why smells travel. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Random movement of particles_

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