Interactive States of Matter Class 4 Worksheets for Hands-On Learning - Free Printable

Let's solve each part of the worksheet step by step and explain the answers clearly.

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1. Fill in the blanks.

a. ______ is anything that has mass and occupies space.
✔ Answer: Matter
👉 *Explanation:* Matter is defined as anything that has mass and takes up space (volume). Examples include solids, liquids, and gases.

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b. ______ have a definite volume, however, they do not have definite shape.
✔ Answer: Liquids
👉 *Explanation:* Liquids have a fixed volume but take the shape of their container. Unlike solids, they are not rigid.

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c. On cooling, matter changes from liquid to solid state. This process is called ______
✔ Answer: Freezing
👉 *Explanation:* When a liquid loses heat and turns into a solid, it’s called freezing. For example, water freezes into ice.

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d. In sublimation ______ directly changes to ______ state.
✔ Answer: Solid → Gas
👉 *Explanation:* Sublimation is when a solid turns directly into a gas without becoming a liquid first. Example: dry ice (solid CO₂) turning into carbon dioxide gas.

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2. Arrange the following in the order of increasing space between their molecules.

> Remember:
> - Solids → molecules are tightly packed
> - Liquids → molecules are closer than gases but can move
> - Gases → molecules are far apart

#### a. Milk, air, table
- Table → solid → least space between molecules
- Milk → liquid → more space than solid
- Air → gas → most space between molecules

✔ Order: Table, Milk, Air

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#### b. Smoke, paper, oil
- Paper → solid → least space
- Oil → liquid → medium space
- Smoke → gas (tiny particles in air) → most space

✔ Order: Paper, Oil, Smoke

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3. Name the process involved in change of state of matter.

#### a. Liquid → Solid
✔ Answer: Freezing
👉 *Explanation:* Cooling a liquid causes it to turn into a solid.

#### b. Liquid → Gas
✔ Answer: Evaporation or Boiling
👉 *Explanation:* The general term for liquid to gas is evaporation (at surface), or boiling (throughout the liquid). Both are acceptable, but evaporation is usually expected unless boiling is specified.

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4. Define.

#### a. Solvent
✔ Definition: A substance that dissolves a solute to form a solution. Usually present in larger amount.
👉 *Example:* Water is a solvent in saltwater.

#### b. Solution
✔ Definition: A homogeneous mixture of two or more substances where one (solute) is dissolved in another (solvent).
👉 *Example:* Saltwater = salt (solute) + water (solvent)

#### c. Volume
✔ Definition: The amount of space an object or substance occupies. Measured in liters (L), milliliters (mL), or cubic units (cm³).

#### d. Condensation
✔ Definition: The process by which a gas changes into a liquid when cooled.
👉 *Example:* Water vapor forming dew on grass.

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✔ Final Answers Summary:

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1. Fill in the blanks:
a. Matter
b. Liquids
c. Freezing
d. Solid → Gas

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2. Order of increasing space between molecules:
a. Table, Milk, Air
b. Paper, Oil, Smoke

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3. Change of state processes:
a. Freezing
b. Evaporation

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4. Definitions:
a. Solvent – The substance that dissolves the solute (e.g., water).
b. Solution – A uniform mixture of solute and solvent.
c. Volume – The amount of space an object occupies.
d. Condensation – The change of gas to liquid.

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