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- 1. Multiple Choice
Which statement best describes the fact that gases can be compressed?
The particles in a gas do not have a fixed volume.
The particles in a gas are very far apart.
The particles in a gas have no force of attraction (bonds) between them.
The particles in a gas are constantly moving very rapidly.
- 2. Multiple Choice
Which statement(s) best describes the fact that a liquid flows?
The particles in a liquid have weak bonds between them.
The particles in a liquid have no fixed position.
The particles in a liquid are close and touching.
The particles in a liquid are moving slowly over each other.
- 3. Multiple Choice
When a liquid evaporates the temperature of the liquid decreases. Which statement(s) best describes why this happens?
Some closely packed particles at the surface of the liquid break the bonds which are keeping them close to neighbouring particles.
Breaking bonds is an endothermic process (requires energy).
When particles enter the gaseous state they take their (kinetic) energy with them.
Particles at the surface of the liquid make bonds with gaseous particles above the surface of the liquid.
Making bonds is an exothermic process (releases energy).
- 4. Multiple Choice
The boiling points of four different liquids are given below. The particles in the liquids have approximately the same mass. Which liquid has the weakest bonds between its particles?
Liquid A boils at 20°C
Liquid B boils at 30°C
Liquid C boils at 40°C
Liquid D boils at 50°C
- 5. Multiple Choice
The three states of matter are represented by diagrams X, Y and Z. Which change occurs during condensation?
X to Y
X to Z
Y to X
Z to X
- 6. Multiple ChoiceWhich of the following substances did Robert Brown observed upon forming the concept of Brownian motion?Talc powder suspended in waterPollen grains suspended in waterTalc powder suspended in airPollen grains suspended in air
- 7. Multiple ChoiceParticles of all matter are in constant random motion.TrueFalse
- 8. Multiple ChoiceIt is the densest among all state of matterSolidLiquidGasPlasma
- 9. Multiple ChoiceA change from gas to liquid involves a _________ in temperatureincreasedecrease
- 10. Multiple Choice
The particles of liquids ________________
vibrate about their fixed postions
are able to slide over each other
move about freely at high speeds and in random direction
do not move
- 11. Multiple Choice
The particles of gases ________________
vibrate about their fixed postions
are able to slide over each other
move about freely at high speeds and in random direction
do not move
- 12. Multiple Choice
A substance has a boiling point of 90°C. What changes occur when it is heated from 50°C to 120°C?
energy of particles increase; attractive forces decrease
energy of particles decrease; attractive forces increase
energy of particles increase; attractive forces increase
energy of particles decrease; attractive forces decrease
- 13. Multiple Choice
When a liquid becomes a solid, what are the changes in the behaviour of the particles? Select all that apply.
Particles lose energy
Particles are unable to overcome forces of attraction
Particles move closer together
The volume decreases
Particles become smaller
- 14. Multiple Choice
How many changes of state occur in this graph?
1
2
3
- 15. Multiple Choice
Which statement about liquids is correct?
They have a fixed shape and a fixed volume.
They have a fixed shape but not a fixed volume.
They have no fixed shape but they do have a fixed volume.
They have no fixed shape and no fixed volume.
- 16. Multiple Choice
Use the diagram to answer the question. Julian removes boiling water from a heat source and places it in a freezer. He then records the water’s temperature as it freezes. The diagram represents the data recorded.
Which segment of the diagram shows where the molecules of water will have the least energy?
segment A
segment B
segment C
segment D
segment E
- 17. Multiple Choice
1. According to the table, which substance would sink in water?
helium
mercury
oxygen
iron pyrite
- 18. Multiple Choice
1. Melting crayons is an example of _____________.
physical change
physical property
chemical change
chemical property
- 19. Multiple Choice
While outside playing ball, Naisir slid on the ground and ripped a hole in his pants. Choose the statement that correctly identifies the type of change that occurred and the supporting evidence.
A chemical change happened because a new substance was created.
A chemical change happened because there was a permanent change to his pants.
A physical change happened because there is not a new substance being formed.
A physical change happened because he physically slid on the ground to cause the rip.
- 20. Multiple Choice
1. According to the section periodic table, how many protons are in oxygen?
6
8
10
16
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