Elements, Compounds, and Mixtures-General

The smallest part of an element that retains the properties of the element is the

• nucleus.

• electron

• atom

• neutron

Which is the best example of a pure substance?

• pizza

• gold

• saltwater

• air

Which substance is a compound?

• copper

• magnesium

• saltwater

• water

What kind of substance is composed of two or more elements that are chemically combined?

• element

• mixture

• solution

• compound

If a substance is composed of atoms arranged in one particular way, how is this substance best classified?

• element

• compound

• mixture

• solution

Table salt, or sodium chloride has the chemical formula NaCl. How is sodium chloride classified?

• as an element

• . as a compound

• as a mixture

• as a liquid

A combination of substances that are not chemically combined is called a

• mixture

• compound

• element

How are mixtures separated?

• Chemical changes

• Physical Changes

• Chemical Properties

• Physical Properties

Earth’s air is made up of molecules of different gases that are not joined chemically. Which term best describes air?

• compound

• mixture

• pure substance

• element

Brass is a metal that is bright red and gold. It is formed by combining, not chemically, two elements, zinc and copper. Based on the information, how would brass be classified?

• an element

• compound

• mixture

• suspension