Lesson 1 - True or False

A substance is a type of matter that has a consistent composition.

• True

• False

Elements are substances that are made up of two or more elements chemically combined.

• True

• False

Whereas a compound is made from the chemical combination of two or more substances, a mixture is made from two or more substances that are physically combined.

• True

• False

Heterogeneous mixtures are mixtures that have a uniform composition throughout the entire sample.

• True

• False

Unlike in the example of compounds, the substances that make up a mixture do not lose their individual properties.

• True

• False

The substances in a mixture can be separated by physical means.

• True

• False

When a compound is formed, altogether a new substance is formed and the properties of which are similar to its constituent elements.

• True

• False

All mixtures have variable composition. It means that the substances that are found in the mixture can be mixed with various proportions or concentrations.

• True

• False

Chemical reactions can break more complex substances down into elements, but elements can only be broken down further by nuclear reactions.

• True

• False

Oxygen is a substance because it has a consistent composition and it is an element because it is only made up of one type of atom.

• True

• False