Chemical Reactions 7 Question Preview (ID: 51230)


Grade Seven : Chemical Reactions.

Butane gas is:
a) A combustible material.
b) A combusting agents.
c) An air pollutant.
d) None of the choices.

The incomplete combustion of a hydrocarbon produces:
a) Oxygen, water vapor and energy.
b) Carbon monoxide, Carbon dioxide, water vapor and energy
c) Carbon dioxide, water vapor and energy.
d) Oxygen, water vapor and energy.

Nitrogen and oxygen are:
a) Two products of combustion reactions.
b) Two air pollutants.
c) Two air constituents.
d) None of the choices.

Complete combustion is:
a) A reaction that produces water vapor and carbon dioxide.
b) An exothermic reaction.
c) A reaction with enough oxygen.
d) All of the choices.

Carbon monoxide is known as the silent killer because it is:
a) Colorless.
b) Odorless.
c) Tasteless.
d) All of the choices.

Gasoline is a combustible material found in:
a) Liquified gas.
b) Liquid state.
c) Solid state.
d) None of the choices.

Breaking Glass is:
a) A chemical Change.
b) A physical Change.
c) Both physical change and chemical change.
d) None of the choices.

Chemical reactions are accompanied by energy in the form of:
a) Light.
b) Electrical energy.
c) Heat or thermal energy
d) All of the choices.

In a chemical reactions:
a) Matter is conserved.
b) Matter is lost.
c) Matter is created and destroyed
d) Matter is gained.

Burning of food is:
a) A chemical change.
b) An exothermic reaction
c) Energy producer.
d) All of the choices.

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