Atoms, Elements and Compounds

True or false:

A colour change is evidence of a chemical reaction.

• true

• false

True or false:

Salt dissolving in water is an example of a chemical reaction.

• true

• false

True or false:

An element is a substance that is made entirely from one type of atom.

• true

• false

True or false:

A temperature change is not evidence of a chemical reaction taking place.

• true

• false

True or false:

Bubbling is evidence of a chemical reaction taking place.

• true

• false

True or false:

The conservation of mass states that the total mass of products at the end of a chemical reaction is equal to the total mass of the reactants at the beginning.

• true

• false

True or false:

A compound is made up of two or more different types of atom chemically bonded together.

• true

• false

True or false:

The columns in the Periodic Table are known as Groups and the rows are known as Periods.

• true

• false

Complete:

Iron + Sulphur --> Iron ___.

• sulphide

• sulphate

• sulphuric acid

True or false:

A mixture is two or more different substances that are not chemically bonded and are therefore easily separated.

• true

• false