Atoms and Molecules

Can a molecule be made of the same type of atoms?

• Yes, for example, O2 (oxygen gas) is a molecule made of two oxygen atoms.

• No, molecules can only be made of different types of atoms.

• Yes, but only in solid form.

• No, molecules are always a combination of at least three different atoms.

What is the process of atoms combining to form molecules called?

• Chemical bonding

• Physical bonding

• Atomic fusion

• Molecular interaction

What is the chemical formula for carbon dioxide?

• CO2

• C2O

• CO

• C2O2

Is CO2 an element?

• Yes, it is an element.

• No, it is a compound made of carbon and oxygen.

• It is a mixture of gases.

• It is a liquid at room temperature.

What is the significance of the subscript in a chemical formula?

• It indicates the number of atoms of each element in a molecule.

• It represents the charge of the molecule.

• It shows the state of matter of the compound.

• It indicates the molecular weight of the compound.

What do we call a substance made of only one type of atom?

• A compound

• An element

• A mixture

• A solution

What is an atom?

• A large particle that makes up molecules.

• The smallest unit of matter that retains the properties of an element.

• A type of chemical bond between two elements.

• A collection of protons and neutrons in a nucleus.

What is the total number of atoms in a molecule of water (H2O)?

• 2

• 3

• 4

• 5

How many atoms are in a molecule of ammonia (NH3)?

• 2 atoms (1 nitrogen atom and 1 hydrogen atom)

• 3 atoms (1 nitrogen atom and 2 hydrogen atoms)

• 4 atoms (1 nitrogen atom and 3 hydrogen atoms)

• 5 atoms (1 nitrogen atom and 4 hydrogen atoms)

What is a molecule?

• A single atom that cannot be divided.

• A group of two or more atoms bonded together.

• A type of chemical reaction.

• A substance that cannot exist independently.