Changing States of Matter Worksheet with labeled diagram illustrating phase transitions.

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. That’s melting.
- So, the arrow from solid to liquid is labeled melting.

2. Liquid → Gas: When a liquid turns into a gas, it's called evaporation.
- So, the arrow from liquid to gas is labeled evaporation.

3. Gas → Liquid: When a gas turns into a liquid, it's condensation.
- So, the arrow from gas to liquid is labeled condensation.

4. Liquid → Solid: When a liquid turns into a solid, it's freezing.
- So, the arrow from liquid to solid is labeled freezing.

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#### Final Labels:

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

> ✔ These are the correct labels for the phase changes.

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

Now let's evaluate 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 melting and freezing points are 0°C, but they are different processes.

✔ Answer: F

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

- ✔ True
- Phase changes are reversible. For example, water freezes to ice (removing heat), and ice melts back to water (adding heat).
- Heat energy drives these changes.

✔ 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, the melting point and freezing point occur at the same temperature (e.g., 0°C).
- It's just the reverse process.

✔ Answer: T

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

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

✔ Answer: F

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

- ✔ True
- Ice = solid
- Liquid water = liquid
- Water vapor = gas
- These are the three physical states of water.

✔ Answer: T

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✔ Final Answers:

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

#### Q.2 True/False:
1. F
2. T
3. T
4. F
5. T

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