Grade 9 Science Review Worksheet: Matter

Matter Review Worksheet

Grade 9 Science Matter Review Worksheet Advanced 25 Questions 10 Views

Classroom Worksheet

Grade 9 Science Review Worksheet: Matter

Matter Review Worksheet

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Grade: Grade 9

Subject: Science

Topic: Matter

Time: 20 Minutes

Difficulty: Advanced

Questions: 25

Instructions:
Read each question carefully and answer in complete sentences when needed. Show your thinking for calculation and explanation questions. Work from the beginning to the end; the questions increase in difficulty.

Skills Practiced:

Matter
Science
Critical Thinking
Problem Solving

1Question

What is matter?

2Question

List the three common states of matter.

3Question

Which state of matter has a definite shape and definite volume?

4Question

Which state of matter has a definite volume but no definite shape?

5Question

Which state of matter has neither a definite shape nor a definite volume?

6Question

Describe what happens to particles in a solid compared with a gas.

7Question

What is the difference between physical change and chemical change?

8Question

Give one example of a physical change involving matter.

9Question

Give one example of a chemical change involving matter.

10Question

What is the law of conservation of mass?

11Question

A student places 50 g of salt in water and stirs until it dissolves. Is this a physical or chemical change? Explain briefly.

12Question

Name the phase change that occurs when a solid changes directly into a gas.

13Question

Name the phase change that occurs when a gas changes directly into a solid.

14Question

What happens to the energy of particles during melting?

15Question

Why does evaporation cool a liquid?

16Question

Compare diffusion in gases and liquids. In which state is diffusion usually faster, and why?

17Question

A material has a fixed volume, can be poured, and takes the shape of its container. What state of matter is it likely in?

18Question

A sample has a mass of 120 g and a volume of 40 cm³. Calculate its density.

19Question

A block of aluminum has a density of 2.7 g/cm³ and a volume of 10 cm³. What is its mass?

20Question

Explain why gases are more compressible than solids.

21Question

A student heats ice at 0°C until it becomes liquid water. During this phase change, the temperature stays the same for a while. Why?

22Question

Identify the type of mixture formed when sand is added to water and left unstirred.

23Question

A sealed container holds a gas. If the temperature of the gas increases, what happens to the pressure if the volume stays constant? Explain briefly.

24Question

Why is density often useful for identifying unknown materials?

25Question

A student claims that all changes in matter are either physical or chemical. Is this claim correct? Defend your answer with a brief explanation.

Answer Key

#	Answer
1	Matter is anything that has mass and takes up space.
2	Solid, liquid, and gas.
3	A solid has a definite shape and definite volume.
4	A liquid has a definite volume but no definite shape.
5	A gas has neither a definite shape nor a definite volume.
6	Particles in a solid are tightly packed and vibrate in place, while particles in a gas are far apart and move freely and rapidly.
7	A physical change changes the form or state of a substance without changing what it is, while a chemical change produces one or more new substances.
8	Examples include melting ice, cutting paper, or dissolving sugar in water.
9	Examples include burning wood, rusting iron, or baking a cake.
10	The law of conservation of mass states that mass is not created or destroyed in a closed system; the total mass stays the same.
11	It is a physical change because the salt does not become a new substance; it is only dispersed in the water.
12	Sublimation.
13	Deposition.
14	Particles absorb energy, and their kinetic energy increases enough for them to move more freely.
15	The fastest-moving particles escape from the liquid, lowering the average kinetic energy of the remaining liquid and causing cooling.
16	Diffusion is usually faster in gases because gas particles are farther apart and move more rapidly than particles in liquids.
17	It is likely a liquid.
18	Density = mass ÷ volume = 120 g ÷ 40 cm³ = 3 g/cm³.
19	Mass = density × volume = 2.7 g/cm³ × 10 cm³ = 27 g.
20	Gas particles are spread far apart with lots of empty space, so they can be pushed closer together more easily than tightly packed solid particles.
21	The added energy is used to overcome intermolecular attractions and change the state, not to increase temperature during the phase change.
22	It forms a heterogeneous mixture because the sand does not dissolve evenly in the water.
23	The pressure increases because the gas particles move faster and collide more often and with greater force against the container walls.
24	Density is a characteristic property that helps distinguish one substance from another because different materials usually have different densities.
25	Yes, the claim is correct in basic science classification because changes in matter are commonly grouped as physical changes, which do not form new substances, or chemical changes, which do form new substances.