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Science MCQs

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Question 621 Easy

What happens to the chemical structure of a substance during a physical change?

A
It is completely broken down.
B
It remains the same.
C
It combines with another structure.
D
It is turned into energy.
Question 622 Easy

Why is the melting of wax considered a physical change?

A
It produces light.
B
It produces new substances.
C
It is reversible and wax retains its properties.
D
It requires a chemical reaction.
Question 623 Easy

The representation of a chemical reaction using symbols and formulae is called a:

A
Chemical formula
B
Chemical equation
C
Reactant notation
D
Product summary
Question 624 Hard

Which of the following is a chemical change?

A
Dissolving salt in water
B
Melting of ice
C
Heating of potassium chlorate
D
Crushing a can
Question 625 Hard

What is the chemical formula of sulphur dioxide?

A
SO2
B
SO3
C
H2SO4
D
SO4
Question 626 Hard

Which of the following is a reactant in the reaction: Zn + 2HCl → ZnCl2 + H2?

A
Zinc chloride
B
Hydrogen
C
Zinc and hydrochloric acid
D
Water
Question 627 Hard

What is the product when zinc reacts with hydrochloric acid?

A
Zinc oxide
B
Zinc chloride
C
Zinc sulphate
D
Zinc carbonate
Question 628 Hard

Which of the following is a physical change?

A
Photosynthesis
B
Respiration
C
Evaporation of water
D
Combustion
Question 629 Hard

What is the effect of carbon monoxide on the environment?

A
It causes global warming
B
It is a poisonous gas
C
It causes acid rain
D
It prevents rusting
Question 630 Hard

Which of the following is a chemical property of baking powder?

A
Solubility
B
Decomposition to produce CO2
C
Melting point
D
Boiling point
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