Question 1

How many hydrogen atoms are in one molecule of water (H₂O)?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 2

What is the total number of atoms in a molecule of carbon dioxide (CO₂)?

Accepted Answer

3

Answer

4

Answer

2

Answer

5

Question 3

In a molecule of ammonia (NH₃), how many nitrogen atoms are present?

Accepted Answer

1

Answer

3

Answer

4

Answer

2

Question 4

How many total atoms are in a glucose molecule (C₆H₁₂O₆)?

Accepted Answer

24

Answer

22

Answer

18

Answer

20

Question 5

How many chlorine atoms are found in a molecule of calcium chloride (CaCl₂)?

Accepted Answer

2

Answer

4

Answer

1

Answer

3

Question 6

What is the total number of atoms in a molecule of sulfuric acid (H₂SO₄)?

Accepted Answer

7

Answer

5

Answer

6

Answer

8

Question 7

How many oxygen atoms are in a molecule of ozone (O₃)?

Accepted Answer

3

Answer

2

Answer

1

Answer

4

Question 8

How many carbon atoms are there in a molecule of methane (CH₄)?

Accepted Answer

1

Answer

2

Answer

4

Answer

3

Question 9

What is the total number of atoms in a molecule of ethylene (C₂H₄)?

Accepted Answer

6

Answer

4

Answer

5

Answer

7

Question 10

How many nitrogen atoms are there in a molecule of dinitrogen tetroxide (N₂O₄)?

Accepted Answer

2

Answer

4

Answer

3

Answer

1

Question 11

Which of the following statements is true about physical changes?

Accepted Answer

They do not create new substances.

Answer

They always release energy.

Answer

They result in a chemical reaction.

Answer

They change the composition of the substance.

Question 12

Which of the following best represents a physical change?

Accepted Answer

Boiling water

Answer

Rusting metal

Answer

Digesting food

Answer

Baking bread

Question 13

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

Accepted Answer

Rust forming on iron

Answer

Dissolving sugar in water

Answer

Melting ice

Answer

Chopping wood

Question 14

What happens during a chemical change?

Accepted Answer

New substances are formed.

Answer

Energy is absorbed but no new substances are created.

Answer

The substance changes shape only.

Answer

The substance changes color but remains the same.

Question 15

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

Accepted Answer

The substance changes shape.

Answer

Heat is released or absorbed.

Answer

Gas is produced.

Answer

A color change occurs.

Question 16

When ice melts into water, what type of change is happening?

Accepted Answer

Physical change

Answer

Biological change

Answer

Nuclear change

Answer

Chemical change

Question 17

Which of the following is a characteristic of a chemical change?

Accepted Answer

Color change indicating a new substance has formed.

Answer

Change in size or shape of an object.

Answer

Mixing two substances together.

Answer

A change in state from solid to liquid.

Question 18

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

Accepted Answer

Baking soda reacting with vinegar.

Answer

Shredding paper

Answer

Melting butter

Answer

Freezing juice

Question 19

What is the main difference between a physical change and a chemical change?

Accepted Answer

A physical change does not alter the chemical composition of a substance.

Answer

A chemical change only involves energy changes.

Answer

A physical change creates new substances.

Answer

A chemical change can be reversed easily.

Question 20

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

Accepted Answer

Rotting fruit

Answer

Mixing oil and water

Answer

Dissolving salt in water

Answer

Melting chocolate

Question 21

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

Accepted Answer

Rust forming on iron

Answer

Dissolving sugar in water

Answer

Breaking a glass

Answer

Melting ice

Question 22

What happens to the molecular structure during a physical change?

Accepted Answer

The molecular structure remains the same

Answer

New substances are formed

Answer

The molecular structure changes completely

Answer

Atoms are rearranged into different compounds

Question 23

Which process is a physical change?

Accepted Answer

Boiling water

Answer

Baking a cake

Answer

Rusting metal

Answer

Burning wood

Question 24

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

Accepted Answer

The change is usually reversible

Answer

Energy is absorbed or released

Answer

Color change may occur

Answer

New substances are formed

Question 25

Which of the following indicates a chemical change has occurred?

Accepted Answer

Bubbles form when vinegar is mixed with baking soda

Answer

Salt dissolves in water

Answer

Water freezes into ice

Answer

Sugar is crushed into smaller pieces

Question 26

What is an example of a physical change?

Accepted Answer

Chopping wood

Answer

Burning gasoline

Answer

Digesting food

Answer

Spoiling milk

Question 27

Which of the following best describes a chemical change?

Accepted Answer

A substance transforms into a different substance

Answer

The size or shape of a material changes

Answer

Only the physical appearance changes

Answer

It can be easily reversed

Question 28

Which process is a sign of a chemical change?

Accepted Answer

Color change in a substance

Answer

Boiling water

Answer

Melting ice

Answer

Dissolving salt in water

Question 29

What happens to the atoms during a chemical change?

Accepted Answer

They are rearranged to form new substances

Answer

They are destroyed

Answer

They remain unchanged

Answer

They are combined only physically

Question 30

Which of the following is a chemical change?

Accepted Answer

Baking bread

Answer

Freezing juice

Answer

Shredding paper

Answer

Mixing sand and salt

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