Question 1

Which of the following is a sign of a chemical reaction?

Accepted Answer

Bubbles forming

Answer

The substance smells sweet

Answer

The temperature is 20 degrees Celsius

Answer

The color is blue

Question 2

What is produced when vinegar reacts with baking soda?

Accepted Answer

Carbon dioxide gas

Answer

Water

Answer

Nitrogen gas

Answer

Oxygen gas

Question 3

What do we call the substances that start a chemical reaction?

Accepted Answer

Reactants

Answer

Products

Answer

Catalysts

Answer

Elements

Question 4

What is the term for the change in color during a chemical reaction?

Accepted Answer

Color change

Answer

Shape change

Answer

Temperature change

Answer

Texture change

Question 5

Which of the following describes a chemical change?

Accepted Answer

Iron rusting

Answer

Breaking a glass

Answer

Melting ice

Answer

Dissolving sugar in water

Question 6

Which of the following represents a chemical reaction?

Accepted Answer

Combining hydrogen and oxygen to make water

Answer

Crushing a can

Answer

Melting chocolate bars

Answer

Boiling water

Question 7

What do we call the substances formed as a result of a chemical reaction?

Accepted Answer

Products

Answer

Catalysts

Answer

Reactants

Answer

Inhibitors

Question 8

What do we call a change in which one or more substances are transformed into different substances?

Accepted Answer

Chemical reaction

Answer

Phase change

Answer

State transition

Answer

Physical change

Question 9

What do we call the substances that undergo change in a chemical reaction?

Accepted Answer

Reactants

Answer

Products

Answer

Catalysts

Answer

Mixtures

Question 10

What kind of chemical reaction occurs when a substance combines with oxygen?

Accepted Answer

Combustion reaction

Answer

Single displacement reaction

Answer

Synthesis reaction

Answer

Decomposition reaction

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