Changing States of Matter - Worksheet | Printable and Distance ... - Free Printable

Let's solve the worksheet step by step.

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Q.1: Label the diagram showing the changing states of matter with the following words:

Words to use:
- freezing
- evaporation
- condensation
- melting

Diagram Description:

We have three main states:
- Solid (ice cube)
- Liquid (pool of water)
- Gas (cloud)

Arrows connect these states, and we need to label each arrow with the correct process.

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#### Step-by-step reasoning:

1. Solid → Liquid:
This is when a solid turns into a liquid.
→ This process is called melting.

2. Liquid → Gas:
This is when a liquid turns into a gas.
→ This process is called evaporation.

3. Gas → Liquid:
This is when a gas turns into a liquid.
→ This process is called condensation.

4. Liquid → Solid:
This is when a liquid turns into a solid.
→ This process is called freezing.

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Now, let’s label the diagram accordingly:

- Arrow from solid to liquid: melting
- Arrow from liquid to gas: evaporation
- Arrow from gas to liquid: condensation
- Arrow from liquid to solid: freezing

✔ So, the labels are:

- Between solid → liquid: melting
- Between liquid → gas: evaporation
- Between gas → liquid: condensation
- Between liquid → solid: freezing

> ✔ Final Answer for Q.1:
> - Top right arrow (liquid → gas): evaporation
> - Bottom left arrow (liquid → solid): freezing
> - Top left arrow (solid → liquid): melting
> - Bottom right arrow (gas → liquid): condensation

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Q.2: Write T (True) or F (False)

Let’s go through each statement:

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1. The temperature at which a solid melts is called its freezing point.

✘ False
- The temperature at which a solid melts is called the melting point.
- The freezing point is the temperature at which a liquid turns into a solid.
- For water, both are the same (0°C), but they refer to opposite processes.

→ Answer: F

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2. Changes in state are reversible and can be made by adding or removing heat.

✔ True
- Yes, phase changes are reversible (e.g., water freezes → ice melts).
- Adding heat causes melting/evaporation; removing heat causes freezing/condensation.

→ Answer: T

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3. The melting and freezing points of a material are the same temperature.

✔ True
- For pure substances like water, melting point and freezing point occur at the same temperature (e.g., 0°C for water).
- It's just the direction of change that differs.

→ Answer: T

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4. At higher temperatures particles in an object move slower.

✘ False
- Higher temperature means particles have more kinetic energy and move faster, not slower.

→ Answer: F

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5. Ice, liquid water, and water vapor are three different states of water.

✔ True
- These are the three physical states of water: solid (ice), liquid (water), gas (water vapor).

→ Answer: T

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✔ Final Answers for Q.2:

1. F
2. T
3. T
4. F
5. T

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✔ Summary:

Q.1 Labels:
- Solid → Liquid: melting
- Liquid → Gas: evaporation
- Gas → Liquid: condensation
- Liquid → Solid: freezing

Q.2 Answers:
1. F
2. T
3. T
4. F
5. T

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