Acids and Bases

What You'll Learn

Acids have a pH below 7 and taste sour, while bases have a pH above 7 and feel slippery. A pH of 7 is neutral, like pure water.

Key Words

isotope
chemical bond
molecular formula

Materials Needed

balloons
measuring cups
paper towels

Safety First

Tie back long hair before starting the experiment.
Protect your work surface with newspaper or plastic.
Adult supervision recommended.

Steps

Step 1 — Read

Read about Matter and Atoms and write down three key facts.

Step 2 — Do

Create a density column: carefully layer honey, dish soap, water, vegetable oil, and rubbing alcohol in a tall glass. Drop small objects in to test where they float.

Step 3 — Observe

Look for patterns in your observations.

Step 4 — Record

Make a graph or chart showing your results.

Check Your Understanding

Question 1

1 of 3

What happens to water when it freezes?