Physical and Chemical Changes Test

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Physical and Chemical Changes Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

Beating silver to make silver foil is _______change.

A
Physical

B
Chemical

C
Biochemical

D
None of these

Solution
Question 2
1 / -0

Which one of the following substances increase in weight by burning in air?

A
Wood

B
Magnesium

C
Paper

D
Candle

Solution

Magnesium increase in weight by burning in air.
When magnesium($$Mg$$) ribbon is burned in the air (with oxygen gas) it forms magnesium oxide ($$MgO$$). This is a new compound formed according to the reaction,
$$2Mg_{(s)} + O_{{2}{(g)}} \longrightarrow 2MgO_{(s)} $$
If we measure the mass of magnesium oxide formed its mass is more than that of magnesium ribbon because the mass of oxygen gas is gets added with magnesium metal and also $$MgO$$ is formed as rust whose mass can be measure.
If we burned wood, paper, or candle in the air they form gaseous products, and hence their mass can not be measure.
Hence, option $$B$$ is correct.
Question 3
1 / -0

Melting of wax is a _________ change.

A
physical

B
chemical

C
Both $$A$$ and $$B$$

D
None of the above

Solution

No new substances are formed when wax melts. This is a physical change. However, if the wax burns, it is a chemical change. The question here is associated with melting, and so the answer is 'physical' change.
Question 4
1 / -0

Which of the following is not a physical change?

A
Melting of wax

B
Tearing a piece of paper

C
Cutting wood

D
Digestion of food

Solution

Chemical digestion is considered a chemical change because enzymes in the stomach and intestine break down large macromolecules into simpler molecules so that the body can easily absorb the food.
Melting of wax, Tearing a piece of paper, Cutting of wood is a physical change because there is not any change in the chemical behaviour of these materials.
Question 5
1 / -0

Dissolution of carbon dioxide gas in water is ________ change.

A
chemical

B
physical

C
Both $$A$$ and $$B$$

D
None of the above

Solution

Dissolution of carbon dioxide gas in water is both physical and chemical change.
Carbon dioxide dissolves in water producing carbonic acid, also known as soda water.
$$ CO_2 + H_2O\rightarrow H_2CO_3$$
Due to dissolution, pressure change takes place. This implies a physical change.
Question 6
1 / -0

Which of the following is an oxide of iron?

A
Vinegar

B
Rust

C
Both $$A$$ and $$B$$

D
None of the above

Solution

Rust is also called hydrated iron oxide. It is, therefore an oxide of iron.
So, correct option is B.
Question 7
1 / -0

Which of the following is a chemical change?

A
Breaking of a brick

B
Evaporation of a liquid

C
Burning of a candle

D
Moving of a wheel

Solution

Burning of the candle is actually chemical change as wax burns to give new substances like carbon dioxide, carbon soot, water vapours, heat and light.
The breaking of brick, evaporation of a liquid and moving of a wheel are physical changes because chemical composition remains same.
Question 8
1 / -0

Which of the following is not a chemical change?

A
Burning of fuels

B
Rusting of iron

C
Drying of clothes

D
Formation of curd from milk

Solution

Drying of clothes is a physical change because it does not involve the creation of a new substance rather it involves the removal or evaporation of water from clothes. since no new substances are formed it is a physical change.
All other changes are chemical changes
Hence, option $$C$$ is correct.
Question 9
1 / -0

Animal dung is digested to produce biogas (process $$A$$). The biogas is used in the stove as a fuel (process $$B$$). Which of the following is correct?

A
Process $$A$$ is a chemical change

B
Process $$B$$ is a physical change

C
Both $$A$$ and $$B$$ are chemical change

D
Both $$A$$ and $$B$$ are physical change

Solution

The waste materials of plant and animal origin undergo decomposition. On decomposition, a combustible gas chemically known as methane is produced by the action of bacteria. In the process of biogas formation digested slurry is produce that can be used as manure in the field. Thus the process of production of biogas is a chemical process. Biogas undergoes combustion when used as fuel in the stove. Thus the process of using biogas is also a chemical change.
Hence, option C is correct.
Question 10
1 / -0

Photosynthesis in plants is a ________ change.

A
chemical

B
physical

C
both $$A$$ and $$B$$

D
None of the above

Solution

Photosynthesis is the process used by plants to produce their food. In this process, light energy is converted into chemical energy.
The chemical reaction which takes place in photosynthesis involves combining of water and carbon dioxide to form glucose and oxygen. Since new chemical species are formed, photosynthesis is clearly a chemical change.

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Physical and Chemical Changes Test - 11

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Physical and Chemical Changes Test - 11

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SHARING IS CARING

Question 1

Physical

Chemical

Biochemical

None of these

Solution

Question 2

Wood

Magnesium

Paper

Candle

Solution

Question 3

physical

chemical

Both $$A$$ and $$B$$

None of the above

Solution

Question 4

Melting of wax

Tearing a piece of paper

Cutting wood

Digestion of food

Solution

Question 5

chemical

physical

Both $$A$$ and $$B$$

None of the above

Solution

Question 6

Vinegar

Rust

Both $$A$$ and $$B$$

None of the above

Solution

Question 7

Breaking of a brick

Evaporation of a liquid

Burning of a candle

Moving of a wheel

Solution

Question 8

Burning of fuels

Rusting of iron

Drying of clothes

Formation of curd from milk

Solution

Question 9

Process $$A$$ is a chemical change

Process $$B$$ is a physical change

Both $$A$$ and $$B$$ are chemical change

Both $$A$$ and $$B$$ are physical change

Solution

Question 10

chemical

physical

both $$A$$ and $$B$$

None of the above

Solution

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