Elements, Compounds, and Mixtures

Front

What are the horizontal rows on the periodic table called?

Back

Periods.

Front

What are the blue numbers in a chemical formula called?

Back

Subscripts.

Front

Which of the following represents an element: H₂O, H₂, NaCl, CaCO₃?

Back

H₂.

Front

How many atoms are there in H₂SO₄?

Back

7.

Front

Which of the following is not a compound: HCl, Cl, NaCl, CO₂?

Back

Cl.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances.

Front

What is a compound?

Back

A substance formed when two or more elements are chemically bonded together.

Front

What is a mixture?

Back

A combination of two or more substances that are not chemically bonded.

Front

What is the chemical formula for water?

Back

H₂O.

Front

What does the coefficient in a chemical equation represent?

Back

The number of molecules of a substance.