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NCERT solutions Science Class 8 chapter 4 Materials : Metals and Non-metals

Chapters

NCERT Science Class 8

Science Textbook For Class 8

Chapter 4 - Materials : Metals and Non-metals

Pages 53 - 55

Which of the following can be beaten into thin sheets?

(a) Zinc

(b) Phosphorus

(c) Sulphur

(d) Oxygen

Q 1 | Page 53

Which of the following statements is correct?

(a) All metals are ductile.

(b) All non-metals are ductile.

(c) Generally, metals are ductile.

(d) Some non-metals are ductile.

Q 2 | Page 53

Fill in the blanks:

Phosphorus is a very _________ non-metal.

Q 3.1 | Page 54

Fill in the blanks:

Metals are ________ conductors of heat and _________.

Q 3.2 | Page 54

Fill in the blanks:

Iron is ________ reactive than copper.

Q 3.3 | Page 54

Fill in the blanks:

Metals react with acids to produce _________ gas.

Q 3.4 | Page 54

Mark ‘T’ if the statement is true and ‘F’ if it is false.

Generally, non-metals react with acids. ( )

Q 4.1 | Page 54

Mark ‘T’ if the statement is true and ‘F’ if it is false.

Sodium is a very reactive metal. ( )

Q 4.2 | Page 54

Mark ‘T’ if the statement is true and ‘F’ if it is false.

Copper displaces zinc from zinc sulphate solution. ( )

Q 4.3 | Page 54

Mark ‘T’ if the statement is true and ‘F’ if it is false.

Coal can be drawn into wires. ( )

Q 4.4 | Page 54

Some properties are listed in the following Table. Distinguish between metals and non-metals on the basis of these properties

Properties Metals Non-metals
1. Appearance Lustrous Dull
2. Hardness Hard Soft
3. Malleability Can be beaten into thin sheets Cannot be beaten into thin sheets
4. Ductility Can be drawn into wires Cannot be drawn into wires
5. Heat Conduction Good conductors of heat Poor conductors of heat
6. Conduction of Electricity Good conductors of electricity Poor conductors of electricity
Q 5 | Page 54

Give reasons for the following.

Aluminium foils are used to wrap food items.

Q 6.1 | Page 54

Give reasons for the following.

Immersion rods for heating liquids are made up of metallic substances.

Q 6.2 | Page 54

Give reasons for the following.

Copper cannot displace zinc from its salt solution.

Q 6.3 | Page 54

Give reasons for the following.

Sodium and potassium are stored in kerosene.

Q 6.4 | Page 54

Can you store lemon pickle in an aluminium utensil? Explain.

Q 7 | Page 54

Match the substances given in Column A with their uses given in Column B.

  A   B
1 Gold a Thermometers
2 Iron b Electric wire
3 Aluminium c Wrapping food
4 Carbon d Jewellery
5 Copper e Machinery
6 Mercury f Fuel
Q 8 | Page 54

What happens when Dilute sulphuric acid is poured on a copper plate?

Write word equations of the reactions involved.

Q 9.1 | Page 55

What happens when Iron nails are placed in copper sulphate solution?

Write word equations of the reactions involved.

Q 9.2 | Page 55

Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.

(a) How will she find the nature of the gas?

(b) Write down word equations of all the reactions taking place in this process.

Q 10 | Page 55

One day Reeta went to a jeweller’s shop with her mother. Her mother gave an old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?

Q 11 | Page 55

NCERT Science Class 8

Science Textbook For Class 8
S