States of Matter Class 5 0 2020 21 07 113423 | PDF - Free Printable

Let's solve each question in the worksheet "States of Matter" step by step and provide clear explanations.

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1. Fill in the blanks.

a. A solid has a definite shape and definite volume.
✔ *Explanation:* Solids maintain their shape and volume because their particles are tightly packed and vibrate in fixed positions.

b. Anything that has weight and occupies space is called matter.
✔ *Explanation:* This is the definition of matter — it includes solids, liquids, and gases.

c. Matter is made up of small particles called atoms.
✔ *Explanation:* Atoms are the smallest units of matter that retain the chemical properties of an element.

d. The change of paper into ash is an example of chemical change.
✔ *Explanation:* Burning paper produces new substances (ash, smoke, gases), which indicates a chemical change.

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2. Who am I?

a. I am a liquid and soluble in water. → Alcohol
✔ *Explanation:* Alcohol (like ethanol) is a liquid that dissolves easily in water.

b. I condense to form water on cooling. → Water vapor
✔ *Explanation:* Water vapor (gas) turns into liquid water when cooled — this is condensation.

c. I am building blocks of matter. → Atoms
✔ *Explanation:* Atoms are the basic units that make up all matter.

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3. Tick (√) the correct word.

a. Alcohol and glycerine are (immiscible / miscible) liquids.
✔ miscible
*Explanation:* Miscible liquids mix completely in all proportions. Alcohol and glycerine dissolve in each other.

b. Atoms of (different / same) kinds combine and give rise to compounds.
✔ different
*Explanation:* Compounds are formed when atoms of different elements chemically bond together (e.g., H₂O from hydrogen and oxygen).

c. In (solid / liquid) molecules are loosely packed.
✔ liquid
*Explanation:* In solids, molecules are tightly packed; in liquids, they are less tightly packed and can move past one another.

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4. Define.

a. Chemical change:
A change in which new substances are formed due to a chemical reaction. It involves breaking and forming chemical bonds.
*Example:* Rusting of iron, burning of wood.

b. Matter:
Anything that has mass and takes up space. It exists in three main states: solid, liquid, and gas.

c. Physical change:
A change in which the substance’s physical properties (like shape, size, state) change, but no new substance is formed.
*Example:* Melting ice, tearing paper.

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5. Answer the following questions in one or two sentences.

a. What are miscible liquids? Give an example.
👉 Liquids that mix completely in all proportions are called miscible liquids. An example is alcohol and water.

b. Solids have a definite shape and volume. Why?
👉 Solids have a definite shape and volume because their particles are tightly packed and held in fixed positions by strong forces.

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6. Answer the following questions in detail.

#### a. Write the properties of solids, liquids, and gases. With the help of diagram show the arrangement of molecules of all three states.

Properties:

| State | Shape | Volume | Compressibility | Flow | Particle Arrangement |
|--------|---------------|----------------|------------------|------------|------------------------|
| Solid | Definite | Definite | Very low | No | Tightly packed, fixed positions |
| Liquid | Takes container shape | Definite | Low | Yes | Loosely packed, can move |
| Gas | No definite | No definite | High | Yes | Very far apart, free movement |

Diagram Description (since we can't draw here):

Imagine three boxes:

1. Solid: Particles shown as closely packed spheres in a regular pattern (like a grid). They vibrate in place.
2. Liquid: Particles are close but not in a fixed pattern — they slide over each other.
3. Gas: Particles are very far apart, moving randomly in all directions.

> You can sketch this using dots or circles:
>
> - Solid: `● ● ●`
> `● ● ●`
> `● ● ●`
>
> - Liquid: `● ● ●`
> `● ● ●`
> `● ●` (slightly disordered)
>
> - Gas: `●` `●` `●` `●` (spread out)

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#### b. Differentiate between physical and chemical changes.

| Feature | Physical Change | Chemical Change |
|------------------------|---------------------------------------------|----------------------------------------------|
| New substance formed? | No | Yes |
| Reversible? | Often reversible (e.g., melting ice) | Usually irreversible (e.g., burning paper) |
| Change in composition? | No — only physical state/size changes | Yes — new substances with different properties |
| Energy change | May involve energy (heat absorbed/released) | Always involves energy change (often more) |
| Examples | Melting ice, boiling water, dissolving sugar | Rusting, cooking food, digestion, burning fuel |

✔ *Key Point:*
- Physical change = change in form, not identity.
- Chemical change = change in identity (new substances formed).

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✔ Final Answers Summary:

1. a. solid
b. matter
c. atoms
d. chemical change

2. a. Alcohol
b. Water vapor
c. Atoms

3. a. miscible
b. different
c. liquid

4. Definitions as above.

5. a. Miscible liquids mix completely — e.g., alcohol and water.
b. Solids have definite shape/volume because particles are tightly packed and fixed.

6. a. Properties explained with particle arrangements described.
b. Differences between physical and chemical changes listed clearly.

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