This States of Matter worksheet helps Science 8 students master key concepts through vocabulary exercises, fill-in-the-blank questions, and visual particle arrangement matching.

Worksheet: Science 8 – States of Matter

#### Vocabulary
- Contracts
- Kinetic molecular theory
- Move around quickly
- State of matter
- Expands
- Mass
- Slide past each other
- Vibrate
- Faster
- Matter
- Slower
- Volume

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Instructions

Use the vocabulary terms to fill in the blanks for the following questions. You will not need to use every term.

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Questions and Solutions

#### 1. ________ is the amount of matter that makes up something.
- Answer: Mass
- Explanation: Mass refers to the amount of matter in an object. It is a fundamental property of matter and does not change with location or state.

#### 2. ________ is the amount of space that a material takes up.
- Answer: Volume
- Explanation: Volume is the measure of the space occupied by a material. It can change depending on the state of matter (solid, liquid, gas).

#### 3. Anything that has mass and volume is called ________.
- Answer: Matter
- Explanation: Matter is anything that has mass and occupies space. It exists in different states (solid, liquid, gas).

#### 4. When you add energy to matter, the particles move ________ and the matter ________.
- Answer: Faster, Expands
- Explanation: Adding energy to matter increases the kinetic energy of its particles, causing them to move faster. This increased movement leads to expansion as the particles spread out more.

#### 5. Particles in a solid are packed so close together they can only ________.
- Answer: Vibrate
- Explanation: In a solid, particles are tightly packed and vibrate in place but do not move freely. This gives solids their rigid structure.

#### 6. Particles in a liquid can ________.
- Answer: Slide past each other
- Explanation: In a liquid, particles are closer together than in a gas but farther apart than in a solid. They can slide past each other, allowing liquids to flow.

#### 7. Particles in a gas can ________.
- Answer: Move around quickly
- Explanation: In a gas, particles are far apart and move rapidly in all directions. This gives gases their ability to expand and fill containers.

#### 8. When you remove energy from particles, they move ________ and the matter ________.
- Answer: Slower, Contracts
- Explanation: Removing energy from matter decreases the kinetic energy of its particles, causing them to move slower. This reduced movement leads to contraction as the particles come closer together.

#### 9. The ________ explains how particles act when their spacing and movement change.
- Answer: Kinetic molecular theory
- Explanation: The kinetic molecular theory describes the behavior of particles in matter based on their motion and interactions. It explains how changes in energy affect particle movement and spacing.

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10. Match each Term on the left with the best Descriptor on the right. Each Descriptor may be used only once.

| Term | Descriptor |
|----------|----------------|
| Mass | C. Amount of matter in an object |
| Solid | D. (Image of tightly packed particles) |
| Gas | F. (Image of widely spaced particles) |
| Matter | A. Anything that has mass and volume |
| Liquid | E. (Image of particles sliding past each other) |
| Volume | B. Amount of space an object takes up |

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Final Answer Summary

1. Mass
2. Volume
3. Matter
4. Faster, Expands
5. Vibrate
6. Slide past each other
7. Move around quickly
8. Slower, Contracts
9. Kinetic molecular theory
10.
- Mass: C
- Solid: D
- Gas: F
- Matter: A
- Liquid: E
- Volume: B

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Boxed Final Answer

\boxed{
\begin{array}{l}
1. \text{Mass} \\
2. \text{Volume} \\
3. \text{Matter} \\
4. \text{Faster, Expands} \\
5. \text{Vibrate} \\
6. \text{Slide past each other} \\
7. \text{Move around quickly} \\
8. \text{Slower, Contracts} \\
9. \text{Kinetic molecular theory} \\
10. \begin{aligned}
&\text{Mass: C} \\
&\text{Solid: D} \\
&\text{Gas: F} \\
&\text{Matter: A} \\
&\text{Liquid: E} \\
&\text{Volume: B}
\end{aligned}
\end{array}
}