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Materials: Metals and Non-Metals
Give reasons for the following: (a) Aluminium foils are used to wrap ...

Give reasons for the following: (a) Alu | Class 8 Science Chapter Materials: Metals and Non-Metals, Materials: Metals and Non-Metals NCERT Solutions

Welcome to the NCERT Solutions for Class 8 Science - Chapter Materials: Metals and Non-Metals. This page offers a step-by-step solution to the specific question from Exercise 1, Question 6: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 6:

Give reasons for the following:
(a) Aluminium foils are used to wrap food items.
(b) Immersion rods heating liquids are made up of metallic substances.
(c) Copper cannot displace zinc from its salt solution.
(d) Sodium and potassium are stored in kerosene.

Answer:

Aluminium is highly malleable and it can easily beaten in the sheets to make its foil for the wrapping purposes. It is also soft and does not reacts with food items; and this is the reason that aluminium foils are used to wrap food items.
Immersion rods made up of metallic substances because metals are good conductor of heat and electricity. They get hot very soon on the passage of electric current and warm the water soon.
Copper is less reactive than zinc. So, it cannot displace zinc from its solution.
Sodium and potassium are highly reactive, so they are stored in kerosene.

Other Questions of Chapter Materials: Metals and Non-Metals

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 2. Hardness 3. Malleability 4. Ductility 5. Heat Conduction 6. Conduction of Electricity

One day Reeta went to a jeweller’s shop with her mother. Her mother gave 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?

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.

In the following Table some substances are given in Column I. In Column II some uses are given. Match the items in column I with those in Column II.

Column I	Column II
(i) Gold (ii) Iron (iii) Aluminium (iv) Carbon (v) Copper (vi) Mercury	(a) Thermometers (b) Electric Wire (c) Wrapping food (d) Jewellery (e) Machinary (d) Fuel

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

Which of the following can be beaten into thin sheets?
(a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen

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

(a) Generally non-metals react with acids.         ( )
(b) Sodium is a very reactive metal.                ( )
(c) Copper displaces zinc from zinc sulphate solution. ( )
(d) Coal can be drawn into wires.             ( )

What happens when
(a) Dilute sulphuric acid is poured on a copper plate?
(b) Iron nails are placed in copper sulphate solution?
Write word equations of the reactions involved.

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.

Fill in the blanks :
(a) Phosphorus is very _________ non-metal.
(b) Metals are ________ conductors of heat and ________ .
(c) Iron is __________ reactive than copper.
(d) Metals react with acids to produce _________ gas.

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The following Table shows the total power shortage in India from 1991– 1997. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.

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Make sketches of animal and plant cells. State three differences between them.

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Complete the crossword with the help of clues given below:
Across
1. This is necessary for photosynthesis.
3. Term for component present in the cytoplasm.
6. The living substance in the cell.
8. Units of inheritance present on the chromosomes.

Down
1. Green plastids.
2. Formed by collection of tissues.
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5. Empty structure in the cytoplasm.
7. A group of cells.

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Fill in the blanks:

(a) Microorganisms can be seen with the help of a ____________.
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(c) Alcohol is produced with the help of __________.
(d) Cholera is caused by __________.

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Select the correct word from the following list and fill in the blanks.
float, water, crop, nutrients, preparation

(a) The same kind of plants grown and cultivated on a large scale at a place is called _____________.
(b) The first step before growing crops is _____________ of the soil.
(c) Damaged seeds would _____________ on top of water.
(d) For growing a crop, sufficient sunlight and _____________ and _____________ from the soil are essential.

Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

Read the question carefully and focus on the core concept being asked.
Reference examples and data from the chapter when answering questions about Materials: Metals and Non-Metals.
Review previous year question papers to get an idea of how such questions may be framed in exams.
Practice answering questions within the time limit to improve your speed and accuracy.
Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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