Bellringer 10-17 Classify the following changes as physical or chemical: An egg breaks A newspaper burns in a fireplace A dish of ice cream melts A loaf of bread is baked

Predict, Observe, Explain

Predict, Observe, Explain What kind of changes did you just observe? What did you notice that was the same about all three? Do you think this is true for all changes? Burning wood?

Let’s read about it… 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 Study Pack #7

Conservation What does this word mean? Where have you heard it before?

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 or boiling water

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 you rearrange building blocks to make something new!

Today’s Target….What was it? Write your own target for today. What was it we wanted to learn from this lesson? Start out with “I understand…”