Water and salt are compounds made of the combination of more than one type of atom. Which statement is false?

A. Because they are compounds, they cannot be pure substances.
B. Both compounds are considered pure substances.
C. These compounds have specific physical properties that never
change.
D. These compounds have distinct chemical properties.

Please explain.

A. Because they are compounds, they cannot be pure substances.

Explanation:

The false statement from the given choices is that because they are compounds they cannot be pure substances. In fact, because they are compounds they are pure substances.

Pure substances are made up of elements and compounds and they have the following properties:

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

1.solid

2.carbon dioxide

3.helium