Question

4. When materials like coal and pencil lead are beaten, their shapes do not
changes, rather break down into small pieces. Why so?​

Answer 1

Answer:

The property of metals by which they can be beaten into thin sheets is called malleability. This is a characteristic property of metals. As you must have noticed, materials like coal and pencil lead do not show this property.

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Answer 2

They are not malleable, they are brittle.

Explanation:

• Materials like coal and pencil lead are beaten, their shapes do not change when applied pressure.
• It is because they are brittle, they simply break when force is applied.
• Their shape do not change because they are not malleable.
• Only malleable substances change their shape.