Conservation of Mass (Part 2)

What You'll Learn

Conservation of mass means that matter cannot be created or destroyed in a chemical reaction. If you start with 10 grams of reactants, you end with 10 grams of products.

Key Words

evaporation
condensation
boiling

Materials Needed

salt
sugar
vinegar
baking soda

Safety First

Wear safety goggles when mixing liquids.
Wash hands after handling materials.

Steps

Step 1 — Read

Read the introduction and identify the main idea of this lesson.

Step 2 — Do

Test 5 household liquids (vinegar, milk, lemon juice, baking soda water, soap) with pH paper. Classify each as acid, base, or neutral.

Step 3 — Observe

Compare the before and after states.

Step 4 — Record

Write your conclusion: did the results match your hypothesis? What would you change next time?

Check Your Understanding

Question 1

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What does conservation of mass mean?