Physical and Chemical Changes Test

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Physical and Chemical Changes Test - 10

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Weekly Quiz Competition

Question 1
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Which of the following change is not a chemical change?

A
Boiling of water

B
Boiling of egg

C
Burning of paper

D
Burning of cloth

Solution

The boiling of water is not a chemical change. If it boils for more time it changes to vapour state which is a physical change.
Whereas boiling of egg, burning of paper and cloth involves both physical and chemical change. The burning of paper and cloth forms ash.
Question 2
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The formation of water is a reversible change. Identify the chemical equation of the formation of water.

A
$${H_2+2O_2\rightarrow 2 H_2O}$$

B
$${2H_2+O_2\rightarrow H_2O}$$

C
$${H_2+O_2\rightarrow H_2O}$$

D
$${2H_2+O_2\rightarrow 2 H_2O}$$

Solution

For a balanced equation, the number of atoms of each element must be the same on both sides of the equation. The number of atoms of hydrogen on the left-hand side of the equation is 4 which is the same on the right-hand side of the equation. The number of atoms of oxygen on the left-hand side of the equation is 2 which is the same on the right-hand side of the equation.
Question 3
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Explosion of a fire work (such as a cracker)

A
Chemical

B
Physical

C
Both A and B possible according to condition

D
Can not be predicted

Solution

An explosion of a cracker is a chemical change because the explosive reactants are transformed into gaseous products along with heat, light, and sound which cannot be reversed.
Question 4
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Which of the following is not a physical change?

A
Dissolution of sugar or salt in water

B
Powdering of sugar

C
Mixing of iron particles and sand

D
Burning of paper

Solution

Physical changes are limited to changes that result in a difference in display without changing the composition. Burning of paper is technically called combustion. It represents a chemical reaction whereby the carbon compounds in the paper are oxidized into different chemicals like carbon dioxide and water vapor. This is a chemical change.
Question 5
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The gas you use in kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out of the cylinder, it becomes a gas (process A), then it burns (process B). Choose the correct statement.

A
Process A is a chemical change

B
Process B. is a chemical change

C
Both processes A and B are chemical changes

D
None of these processes is a chemical change

Solution

LPG gas is also known as propane or butane are mixtures of hydrocarbon gases. LPG is heavier than air and it is flammable when ignition source is present.
Question 6
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Which of the following is not a chemical change?

A
Rusting of iron

B
Converting water into steam

C
Making curd from milk

D
Heating coal

Solution

$$(a)$$ Rusting of iron :- chemical change
$$F{ e }_{ \left( S \right) }+{ O }_{ 2 }+3{ H }_{ 2 }O\longrightarrow \underbrace { { Fe }_{ 2 }{ O }_{ 3 }.3{ H }_{ 2 }O } $$
irreversible
composition changed

$$(b)$$ $${ H }_{ 2 }{ O }_{ \left( l \right) }\rightleftharpoons { H }_{ 2 }{ O }_{ \left( g \right) }$$
(water) (stream)
(reversible) $$\downarrow $$
no change in composition only state charge
Hence reversible change and physical change.
$$(c)$$ Milk $$\rightarrow $$ Curd
chemical change
$$(d)$$ Burning of coal is a chemical change.
The chemical reaction for this-
$$C+O_2\rightarrow CO_2+H_2O$$
Question 7
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Classify the changes involved in the following process as physical or chemical changes.
Dissolving sugar in water.

A
Physical

B
Chemical

C
Both A and B possible according to condition

D
Can not be predicted

Solution

Dissolving sugar in water in water is usually considered to be a physical change, in this process there is no new chemical species form.
Question 8
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Which of the following is a chemical change?

A
Boiling of water to give water vapor.

B
Melting of ice to give water

C
Dissolution of salt is water

D
Rusting of iron

Solution

Rusting is the process by which iron changes to hydrated iron oxide or rust when iron comes in contact with oxygen and water. Since, a new chemical substance is formed in this process, it is a chemical change.
Question 9
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Which of the following statements is true?

A
Chemical changes are reversible

B
Only very few chemical reactions are irreversible

C
Growth of a tree is periodic change

D
Rusting of iron is a fast change
Question 10
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Steel is preferred over iron in construction of ships because:

A
melting point of steel is higher than iron

B
steel is more uniform than iron

C
steel does not rust

D
tensile strength of steel is not high

Solution

The material chosen for the construction of a ship is a balance between strength, corrosion resistance, workability and cost. High tensile steels are used in ships.
Steel remains stainless or does not rust because of the interaction between its alloying elements and the environment. Stainless steel contains iron, chromium, molybdenum, manganese, silicon, carbon, nickel etc
Hence, the correct option is $$\text{C}$$

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Physical and Chemical Changes Test - 10

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Physical and Chemical Changes Test - 10

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Question 1

Boiling of water

Boiling of egg

Burning of paper

Burning of cloth

Solution

Question 2

$${H_2+2O_2\rightarrow 2 H_2O}$$

$${2H_2+O_2\rightarrow H_2O}$$

$${H_2+O_2\rightarrow H_2O}$$

$${2H_2+O_2\rightarrow 2 H_2O}$$

Solution

Question 3

Chemical

Physical

Both A and B possible according to condition

Can not be predicted

Solution

Question 4

Dissolution of sugar or salt in water

Powdering of sugar

Mixing of iron particles and sand

Burning of paper

Solution

Question 5

Process A is a chemical change

Process B. is a chemical change

Both processes A and B are chemical changes

None of these processes is a chemical change

Solution

Question 6

Rusting of iron

Converting water into steam

Making curd from milk

Heating coal

Solution

Question 7

Physical

Chemical

Both A and B possible according to condition

Can not be predicted

Solution

Question 8

Boiling of water to give water vapor.

Melting of ice to give water

Dissolution of salt is water

Rusting of iron

Solution

Question 9

Chemical changes are reversible

Only very few chemical reactions are irreversible

Growth of a tree is periodic change

Rusting of iron is a fast change

Question 10

melting point of steel is higher than iron

steel is more uniform than iron

steel does not rust

tensile strength of steel is not high

Solution

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