1. Bellringer
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

2. Predict, Observe, Explain

3. 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?

4. Let’s read about it…
Read pages 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?

5. Law of Conservation of Mass
Study Pack #7

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

7. 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

8. 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

9. 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!

10. 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…”