Physical and Chemical Changes Test

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Physical and Chemical Changes Test - 14

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Weekly Quiz Competition

Question 1
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Which of the following is a physical change?

A
Burning of magnesium.

B
Exposure of iron to moisture and air.

C
Dissolution of sugar in water.

D
None of above.

Solution

The burning of magnesium leads to a formation of a new substance. Hence, it's a chemical change.
Exposure of iron to moisture and air leads to the formation of a new substance known as rust. Hence it's a chemical change too.
The dissolution of sugar in water is a physical change as there is no formation of a new substance and only a change in the state of sugar particles.
Question 2
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When magnesium ribbon burns in the air, it forms white ash. The chemical name of white ash is:

A
Magnesium dioxide

B
Magnesium hydride

C
Milk of magnesia

D
Magnesium oxide

Solution

When magnesium ribbon burns in the air, it forms magnesium oxide. It is a white solid.
$$2Mg + O_2 \rightarrow 2MgO$$

Hence, the correct option is $$D$$.
Question 3
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Which of the following is not a chemical change?

A
Whipping eggs

B
Burning wood

C
Digestion

D
All of above

Solution

Simply whipping of eggs does not produce any new substance. Hence, it is a physical change. But digestion and burning of wood result in the formation of new substances. Thus, they are physical changes.

Hence, the correct option is $$\text{A}$$
Question 4
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Which of the following statements is not correct?

A
In a chemical change, color of the object may change.

B
In a chemical change, heat will always be released.

C
A chemical change always involves a physical change.

D
Rusting of iron becomes faster when humidity is high.

Solution

Signs of a chemical reaction include unexpected color change. When copper reacts with the elements, it turns from its element color of reddish-brown to green. So it is a chemical change.
Heat may or may not be released in a chemical reaction. It depends on the type of reaction.
Chemical changes cause a substance to change into an entire substance with a new chemical formula. So its shape, size, etc also changes.
For rusting, the presence of both oxygen and water is essential. The content of moisture in the air is high, which means if it is more humid, rusting becomes faster.
Hence, the correct option is B.
Question 5
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$$H_{2}O_{(l)}\rightleftharpoons H_{2}O_{(g)}$$
What type of change is represented by the equation above?

A
This is a physical change because the equation is balanced.

B
This is chemical change because the equation is balanced.

C
This a physical change because the same compound is represented as both the reactant and product.

D
This a chemical change because the same compound is represented as both the reactant and product.

Solution

Physical change as can be reserved by cooling.
$$\rightarrow $$ there is no change in the chemical composition of the molecule, represented by the same molecular formulae.
Question 6
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Which of the following is a physical change?
a) Hammering of a red hot iron rod to make a flat sheet.
b) Formation of ice by cooling of water.
c) Rising of water vapors from sea to make clouds.
d) Heating of charcoal in the air to high temperature till it begins to flow.

A
a, b and c

B
b, c and d

C
c, d and a

D
d, a and b

Solution

a, b, and c represent physical changes and d represents chemical changes.
Physical changes:
a) Hammering of a red hot iron rod to make a flat sheet.
b) Formation of ice by cooling of water.
c) Rising of water vapors from sea to make clouds.

Chemical changes:
d) Heating of charcoal in the air to high temperature till it begins to flow.

Note: During a physical change, there is no change in the nature of the substance. However, during a chemical change, a chemical reaction converts one substance into another with energy being either released or given out.
Question 7
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Which of the following BEST describes the differences between particles of solid and particles of liquid?

A
Particles of solid have smaller size than particles of liquid.

B
Particles of solid move around more freely than particles of liquid.

C
Particles of liquids move around more freely than particles of solid.

D
Particles of liquid experience stronger attractive forces than particles of solid.

Solution

Particles of liquid move around more freely than particles of solid.
This is because of particles of liquid experience weaker attractive forces than particles of solid.

Hence, option (C) is the answer.
Question 8
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Boiling water is a _____ change because _____.

A
Physical, the gaseous water produced is chemically identical to the liquid water the process began with

B
Physical, the water was disappeared

C
Chemical, heat was required for the change

D
Chemical, the process produced a gas

Solution

Boiling water is a physical change because the gaseous water produced is chemically identical to the liquid water i.e both of them have the same molecular structure of the water.
Question 9
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Which of the following is a chemical change?

A
Boiling of eggs

B
Evaporation of water

C
Formation of snow

D
Melting of wax

Solution

Chemical changes result in the formation of new substances, and the changes that occur cannot be reversed. The heat from boiling an egg causes the egg's protein to change permanently in texture. It is a chemical change.
Evaporation of water, formation of snow and melting of wax are physical changes, as no new substances are formed.
Question 10
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Which of the following is a physical change?

A
Magnetisation of iron

B
Curdling of milk

C
Burning of a candle

D
Cooking of food

Solution

Magnetization of iron is a physical change and not a chemical change as there is no change of state, no change of temperature, no smell and no evolution of gas. It is because: - no chemical process is involved. - After demagnetizing the iron it will lose its magnetic power. Also, the chemical composition of iron doesn't change after magnetization, it only affects its physical properties
Rest all others like cuddling of milk, burning of candle and cooking of food are chemical processes which involve a change in temperature, change in state, smell and evolution of gases.

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Physical and Chemical Changes Test - 14

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Question 1

Burning of magnesium.

Exposure of iron to moisture and air.

Dissolution of sugar in water.

None of above.

Solution

Question 2

Magnesium dioxide

Magnesium hydride

Milk of magnesia

Magnesium oxide

Solution

Question 3

Whipping eggs

Burning wood

Digestion

All of above

Solution

Question 4

In a chemical change, color of the object may change.

In a chemical change, heat will always be released.

A chemical change always involves a physical change.

Rusting of iron becomes faster when humidity is high.

Solution

Question 5

This is a physical change because the equation is balanced.

This is chemical change because the equation is balanced.

This a physical change because the same compound is represented as both the reactant and product.

This a chemical change because the same compound is represented as both the reactant and product.

Solution

Question 6

a, b and c

b, c and d

c, d and a

d, a and b

Solution

Question 7

Particles of solid have smaller size than particles of liquid.

Particles of solid move around more freely than particles of liquid.

Particles of liquids move around more freely than particles of solid.

Particles of liquid experience stronger attractive forces than particles of solid.

Solution

Question 8

Physical, the gaseous water produced is chemically identical to the liquid water the process began with

Physical, the water was disappeared

Chemical, heat was required for the change

Chemical, the process produced a gas

Solution

Question 9

Boiling of eggs

Evaporation of water

Formation of snow

Melting of wax

Solution

Question 10

Magnetisation of iron

Curdling of milk

Burning of a candle

Cooking of food

Solution

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