Question

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.

Answer 1

Answer:

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:

• All parts are the same throughout
• Composition is definite
• They cannot easily be separated or broken
• Separation by physical method is not easy
• They have unique sets of physical and chemical properties.