Transcript Law of Conservation of Mass

Bellringer
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10-17
Classify the following changes as
physical or chemical:
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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
Predict, Observe, Explain
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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?
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Burning wood?
Let’s read about it…
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Read pages 84-86 on The Law of
Conservation of Mass
Try to answer these questions as you
read…
1. Are the ashes left behind by a fire the
same mass as the wood was before?
2. If not, where else does the mass go?
Law of Conservation of Mass
Study Pack #7
Conservation
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What does this word mean?
Where have you heard it before?
Law of Conservation of Mass
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The mass of what you end with is
always the mass of what you started
with
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In physical AND chemical changes
Law of Conservation of Mass
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Where does it go?
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Page 85
Sometimes the mass we think has
disappeared is now in the form of a gas
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Example: burning wood or boiling water
Law of Conservation of Mass
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Mass is not created or destroyed during
physical or chemical changes
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Page 86
The particles in substances only rearrange
to form new substances
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Like you rearrange building blocks to make
something new!
Today’s Target….What was it?
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Write your own target for today.
What was it we wanted to learn from
this lesson?
Start out with “I understand…”