Elements and Compounds

What You'll Learn

Elements are pure substances made of only one type of atom. Compounds are substances made of two or more elements chemically bonded in fixed ratios.

Key Words

exothermic
reactant

Steps

Step 1 — Read

Read and learn: Elements are pure substances made of only one type of atom. Compounds are substances made of two or more elements chemically bonded in fixed ratios.

Step 2 — Do

Measure and record your data in a table.

Step 3 — Observe

Observe what happens and describe it in detail.

Step 4 — Record

Record your observations in your science journal.

Check Your Understanding

Question 1

1 of 3

What is a compound?