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

Mass Chapter Review

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

Law of Conservation of Mass

Study Pack #9

Today’s Goal… I can explain the law of

conservation of mass..

Think about it! What is mass? Is the mass the same before and

after a physical change? Melting ice Cutting paper Molding clay

Think about it! Is the mass the same before and

after a chemical change? Rusting iron Baking a cake Burning wood

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?

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

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

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

Assignment Page 91 – Visualizing Main Ideas Page 92 – Checking Concepts #1-

15 Page 93 – Thinking Critically #20