1. Today’s Agenda…10-5 Bellringer: What is mass? Turn in Letters Notes on Law of Conservation of Mass Chapter Review

2. Name That Change… Physical (1) or Chemical (2) Freezing Water Making toast Sharpening a Pencil Melting silver to make jewelry An apple turns brown when left out in the air Oil burning

3. Law of Conservation of Mass Study Pack #9

4. Today’s Goal… I can explain the law of conservation of mass..

5. Think about it! What is mass? Is the mass the same before and after a physical change? Melting ice Cutting paper Molding clay

6. Think about it! Is the mass the same before and after a chemical change? Rusting iron Baking a cake Burning wood

7. Reading… Read pages 84-86 on The Law of Conservation of Mass Try to answer these questions as you read… Are the ashes left behind by a fire the same mass as the wood was before? If not, where else does the mass go?

8. Law of Conservation of Mass The mass of what you end with is always the mass of what you started with In physical AND chemical changes

9. Law of Conservation of Mass Where does it go? Page 85 Sometimes the mass we think has disappeared is now in the form of a gas Example: burning wood

10. Law of Conservation of Mass Mass is not created or destroyed during physical or chemical changes Page 86 The particles in substances only rearrange to form new substances Like students in a school

11. Assignment Page 91 – Visualizing Main Ideas Page 92 – Checking Concepts #1-15 Page 93 – Thinking Critically #20