🔬 Part 1: Understanding Conservation of Mass

1. What is the principle of conservation of mass?

Mass can be created and destroyed during reactions

Mass is never lost, only transformed

Mass increases when substances react together

Mass only applies to liquids and gases

2. You place 200g of ice cubes in a sealed container. The ice melts completely. What is the total mass of the contents after melting?

Less than 200g

Exactly 200g

More than 200g

Cannot be determined

3. Which of these are examples where conservation of mass applies? (Check all that apply)

Burning a piece of paper

Dissolving sugar in water

Mixing vinegar and bicarb soda

Boiling water in an open pot

📊 Part 2: Hands-On Activity Results

4. Record your experimental data from the effervescent tablet activity:

Mass of sealed bag + cup + liquid BEFORE adding tablet: __________ grams

Mass of sealed bag + cup + liquid AFTER tablet dissolved: __________ grams

5. What did you observe during the reaction inside the sealed bag?

6. Explain why the mass stayed the same even though the tablet dissolved and created bubbles.

🤔 Part 3: Real-World Applications

7. A log weighs 5kg before burning. After burning completely, the ash weighs only 0.5kg. Where did the other 4.5kg go, and how does this relate to conservation of mass?

8. You seal water and vinegar in a bag, then add bicarb soda. The bag inflates due to gas production. Will the mass of the sealed bag before and after the reaction be the same? Explain your reasoning.

9. Give one everyday example where you can observe conservation of mass in action: