Conservation of Mass (Part 3)

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

baking soda
cups
spoons
food coloring
plastic bottles
balloons

Safety First

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

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?