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CIE iGCSE Co-Ordinated Science P2.1.2 Particle model Exam Style Questions Paper 2

CIE iGCSE Co-Ordinated Science Paper 2 - All Chapters

Question

Which statement explains why smoke particles are made to move by other particles in Brownian motion?

A. The other particles are larger and move faster than smoke particles.
B. The other particles are larger and move slower than smoke particles.
C. The other particles are smaller and move faster than smoke particles.
D. The other particles are smaller and move slower than smoke particles.

▶️ Answer/Explanation
Brownian motion is the random movement of larger smoke particles caused by collisions with much smaller, faster-moving air molecules. The smaller particles (molecules) move rapidly and impart momentum to the smoke particles. Thus, option C is correct.
✅ Answer: (C)

Question

Which statement about gas particles is not correct?

A. Increasing the temperature of a gas makes the gas particles move more slowly.
B. The gas particles are in constant random motion.
C. The pressure of a gas is caused by the collision of gas particles with the container.
D. Very small particles suspended in a gas are in constant random motion.

▶️ Answer/Explanation
Increasing the temperature of a gas increases the kinetic energy of its particles, making them move faster, not more slowly.
The other statements correctly describe random particle motion and how gas pressure arises from particle collisions with the container walls.
✅ Answer: (A)
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