Question 1

What happens during a chemical change?

Accepted Answer

A new substance is formed

Answer

The temperature increases

Answer

The substance changes color

Answer

The substance evaporates

Question 2

Which of the following is an example of a chemical change?

Accepted Answer

Rust forming on iron

Answer

Breaking a glass

Answer

Melting ice

Answer

Dissolving sugar in water

Question 3

What is one indicator that a chemical change has occurred?

Accepted Answer

Production of gas

Answer

Change in state

Answer

Color remains the same

Answer

Change in size

Question 4

Which of the following is NOT a characteristic of chemical changes?

Accepted Answer

Reversible under normal conditions

Answer

Color change

Answer

Formation of a precipitate

Answer

Change in temperature

Question 5

What is produced when vinegar is mixed with baking soda?

Accepted Answer

Carbon dioxide gas

Answer

Salt

Answer

Oxygen gas

Answer

Water

Question 6

What is a common example of a chemical change that occurs in food?

Accepted Answer

Cooking an egg

Answer

Mixing flour and water

Answer

Freezing ice cream

Answer

Cutting vegetables

Question 7

What is produced when iron rusts?

Accepted Answer

Iron oxide

Answer

Iron hydroxide

Answer

Iron chloride

Answer

Iron sulfate

Question 8

What can often be observed when a chemical reaction takes place?

Accepted Answer

Bubbles forming

Answer

Sugar dissolving

Answer

Water freezing

Answer

Light being turned on

Question 9

Which of the following is NOT a sign of a chemical reaction?

Accepted Answer

Dissolving a solid in water

Answer

Bubbles formation

Answer

Temperature change

Answer

Color change

Question 10

What is an indicator of a chemical reaction occurring?

Accepted Answer

Production of gas

Answer

All of the above

Answer

Change in color

Answer

Increase in temperature

Question 11

What is the term for the starting substances in a chemical reaction?

Accepted Answer

Reactants

Answer

Products

Answer

Compounds

Answer

Elements

Question 12

Which of the following is an example of a chemical change?

Accepted Answer

Rust forming on metal

Answer

Dissolving salt

Answer

Melting ice

Answer

Boiling water

Question 13

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

Accepted Answer

Products

Answer

Elements

Answer

Ingredients

Answer

Reactants

Question 14

What is a chemical reaction?

Accepted Answer

A process where substances change into new substances

Answer

A technique to measure weight

Answer

An experiment with plants

Answer

A process of mixing liquids

Question 15

What happens during a chemical change?

Accepted Answer

New substances are formed.

Answer

The substance changes shape.

Answer

The substance dissolves in water.

Answer

The substance changes color.

Question 16

Which of the following is an example of a chemical change?

Accepted Answer

Baking a cake.

Answer

Melting ice.

Answer

Shredding paper.

Answer

Dissolving sugar in water.

Question 17

What do we call a change that produces a new substance with different properties?

Accepted Answer

Chemical change.

Answer

Physical change.

Answer

Thermal change.

Answer

Mechanical change.

Question 18

Which of the following is NOT a characteristic of a chemical change?

Accepted Answer

The substance can be easily reversed back to the original.

Answer

Energy may be released or absorbed.

Answer

A color change may occur.

Answer

A gas may be produced.

Question 19

What is one effect of rusting on iron?

Accepted Answer

It forms a new substance, iron oxide.

Answer

It makes the iron stronger.

Answer

It changes the color of the iron to blue.

Answer

It causes the iron to become lighter.

Question 20

What is created during a combustion reaction?

Accepted Answer

Heat and light are produced.

Answer

Only smoke is produced.

Answer

Oxygen is absorbed.

Answer

No changes occur.

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