3-3 KMT Worksheet - Free Printable

Kinetic Molecular Theory Worksheet Solution

#### Part 1: Phases of Matter
The boxes represent matter in the three common phases:
- A: Solid
- B: Liquid
- C: Gas

#### Part 2: Fill in the Blanks

1. The word kinetic comes from a Greek word that means “to move.” The kinetic molecular theory is based upon the assumption that atoms are in constant _________.
- Answer: Random Motion

2. State the names of the phases in order of Temperature, Kinetic Energy, density and bond strength between atoms.

| Lowest Temperatures | In between Temperatures | Highest Temperatures |
|---------------------|--------------------------|-----------------------|
| Lowest Kinetic Energy | In between Kinetic Energy | Highest Kinetic Energy |
| Solid | Liquid | Gas |
| Lowest Density | In between Density | Highest Density |
| High Strength Bonds | Weak Bonds | No Bonds |

3. _________ is directly related to temperature. As the temperature increases so does the __________.
- Answer: Kinetic Energy, Kinetic Energy

4. Compared to Solids and Liquids gases tend to have a lower ________. This can be explained by the fact that there is so much _________ between particles in a gas.
- Answer: Density, Empty Space

5. A small pressure will easily ________ a gas. If this happens its ________ will increase. The space between the atom will (INCREASE or DECREASE).
- Answer: Compress, Density, DECREASE

6. Even a large pressure will not ________ a solid because the atoms are so closely packed.
- Answer: Compress

7. Solids have strong ________ s, liquids have weaker ________ s and gases have no ________ s holding them together.
- Answer: Bonds, Bonds, Bonds

8. A solid like ice or diamond has a highly ordered arrangement of bonds between atoms which is called its ________. A liquid or gas does not have this.
- Answer: Structure

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Explanation of Solutions

#### Part 1: Phases of Matter
- Solid (A): Particles are tightly packed in a fixed structure with strong bonds.
- Liquid (B): Particles are close together but can move past each other, maintaining some structure.
- Gas (C): Particles are far apart and move freely with minimal interaction.

#### Part 2: Fill in the Blanks

1. Random Motion: The kinetic molecular theory assumes that particles are always in motion, which is why "random motion" is the correct term here.

2. Ordering of Phases:
- Temperature: Solids have the lowest temperatures, liquids are in between, and gases have the highest temperatures.
- Kinetic Energy: Corresponds directly to temperature.
- Density: Solids are most dense, liquids less dense, and gases least dense.
- Bond Strength: Solids have strong bonds, liquids have weaker bonds, and gases have no bonds.

3. Kinetic Energy and Temperature: Kinetic energy is directly proportional to temperature. As temperature increases, so does the kinetic energy of the particles.

4. Density and Empty Space: Gases have lower density compared to solids and liquids because there is more empty space between particles in a gas.

5. Compression of Gases: Gases are compressible because the particles are far apart. When compressed, the density increases, and the space between particles decreases.

6. Compression of Solids: Solids are not compressible because the particles are already tightly packed and cannot be pushed closer together.

7. Bonds in Different Phases:
- Solids have strong bonds holding particles in a fixed structure.
- Liquids have weaker bonds, allowing particles to move past each other.
- Gases have no bonds, and particles move freely.

8. Structure in Solids: Solids like ice or diamond have a highly ordered arrangement of bonds, giving them a defined structure. Liquids and gases lack this ordered structure.

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Final Answer

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\text{See detailed solutions above.}
}