Plasma: The Fourth State (Part 2)

What You'll Learn

Catalysts speed up chemical reactions without being consumed. Enzymes are biological catalysts that help reactions happen in living organisms at body temperature.

Key Words

freezing point
gas
solid

Materials Needed

paper towels
thermometer
strainer
ice cubes
salt
sugar

Safety First

Be careful with scissors — ask an adult for help if needed.

Steps

Step 1 — Read

Study the diagram and label the parts you recognize.

Step 2 — Do

Mix baking soda and vinegar in a sealed bag. Weigh the bag before and after. Did the mass change? Explain why or why not using the law of conservation of mass.

Step 3 — Observe

Watch carefully for any changes and note the time.

Step 4 — Record

Create a data table to organize your measurements.

Check Your Understanding

Question 1

1 of 3

What is an example of a physical change?