[MCQ] Chemistry Level 2

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CHEMISTRY Brilliant MCQ

KINETIC PARTICLE THEORY

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Question 1 of 5

1. Question
1 point(s)
Gas molecules at room temperature are able to move at very high velocities. However, when a bottle of perfume is opened at the end of a large room, it may take several minutes before its smell can be detected at the other end.

Which of the following explains this phenomenon?
- Random collisions among perfume molecules.
- Increase in space occupied by perfume molecules.
- Random collisions of perfume molecules and air molecules.
- Attractive forces between the air and the perfume molecules.
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Question 2 of 5

2. Question
1 point(s)
Which of the following does not involve a physical change of state of a substance?
- Recovering water from the sea
- Fractional distillation of crude oil
- Hydrogenation of vegetable oils to form solid margarine
- Formation of white vapours when dry ice is left at room temperature
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Question 3 of 5

3. Question
1 point(s)
The diagrams show the particles in a substance at two different temperatures but at the same pressure.

Which of the following most likely indicates the melting point and boiling point of the substance?
- A
- B
- C
- D
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Question 4 of 5

4. Question
1 point(s)
Pure water contains some dissolved air. A beaker containing a solution of sodium chloride in pure water has been boiling for 30 minutes. What is/are inside the bubbles in the boiling water?
- Air
- Heat
- Water vapour
- Oxygen gas and hydrogen gas
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Question 5 of 5

5. Question
1 point(s)
Which of the following gives out heat energy and involves the largest change in volume?
- Boiling
- Freezing
- Sublimation
- Condensation
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