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- 1. Multiple Choice
Which statement about evaporation is correct?
Evaporation causes the temperature of the remaining liquid to decrease.
Evaporation does not occur from a cold liquid near its freezing point.
Evaporation does not occur from a dense liquid, such as mercury
Evaporation occurs from all parts of a liquid.
- 2. Multiple Choice
A substance loses thermal energy (heat) to the surroundings at a steady rate. The graph shows how the temperature of the substance changes with time. What could the portion PQ of the graph represent?
gas condensing
gas cooling
liquid cooling
liquid solidifying
- 3. Multiple Choice
What causes the random, zig-zag movement (Brownian motion) of smoke particles suspended in air?
air molecules colliding with smoke particles
convection currents as the hot smoke rises
smoke particles colliding with each other
smoke particles reacting with oxygen molecules in the air
- 4. Multiple Choice
The same quantity of thermal energy is supplied to two solid objects X and Y. The temperature increase of object X is greater than the temperature increase of object Y. Which statement explains this?
X has a lower melting point than Y.
X has a lower density than Y.
X has a lower thermal capacity than Y.
X is a better thermal conductor than Y.
- 5. Multiple Choice
Air in a sealed syringe is slowly compressed by moving the piston. The temperature of the air stays the same. Which statement about the air is correct?
The pressure of the air decreases because its molecules now travel more slowly.
The pressure of the air decreases because the area of the syringe walls is now smaller.
The pressure of the air increases because its molecules now hit the syringe walls more frequently.
The pressure of the air increases because its molecules now travel more quickly.
- 6. Multiple Choice
Which statement describes what happens as ice at 0°C starts to melt to become water?
Energy is absorbed and the temperature remains constant.
Energy is absorbed and the temperature rises.
Energy is released and the temperature remains constant.
Energy is released and the temperature rises.
- 7. Multiple Choice
Which row is correct for the evaporation of a liquid?
A
B
C
D
- 8. Multiple Choice
A liquid at room temperature fills a flask and a glass tube to level X. The flask is now placed in ice, and the liquid level in the tube falls to level Y. Why does the level fall?
The flask contracts.
The flask expands.
The liquid contracts.
The liquid expands.
- 9. Multiple Choice
The diagrams represent the molecules in two different states of matter. The arrows show the motion of the molecules.
A
B
C
D
- 10. Open Ended
A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C. Calculate the specific heat capacity of iron.
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