1.) When an egg is cooked, it
becomes a new material with
different characteristics. Agree?
Explain.
TURN AND TALK! WHAT DO YOU THINK?
The science you need to know to answer
this homework question:
As you have been taught – everything is
made of matter.
Matter can be changed. There are two types
of changes:
Science Notebook Time: (Make a T chart in
your note book – don’t forget to date the
chart.)
Signs That a Change is
Chemical/ “New Substance”
Signs That a Change is
Physical
Add the following information to your T
chart:
Signs That a Change is Chemical/
“New Substance”
 Molecules are changed
(burning)
 Color change
 Bubbles/releasing a gas




The change can’t be changed
back (cake batter into cooked
cake/ cooked cookie dough)
Rust/oxidation(coating) on
metals
Precipitates can form (solids)
Temperature change
Signs That a Change is Physical




Molecules stay the same
(melting)
Color remains the same
Smaller pieces of the same
material
Substance is dissolved into a
liquid with no bubbling
Watch the Study Jam on Chemical v. Physical
Changes:
Click on the
Picture
Get your sentence starter ready!
ON YOUR HOMEWORK CONTRACT! MS.
FRAMBES HAS EXTRA MATERIALS IF YOU
LOST YOUR CONTRACT.
So…
Do you agree? When you cook an egg DOES
it become a new material with different
characteristics?
Can you uncook it? Is the change chemical?
2.) Water freezing and melting is
an example of a chemical
change. Agree? Explain.
TURN AND TALK! WHAT DO YOU THINK?
The science you need to know to answer
this homework question:
You learned during our study of the water
cycle that water freezes, melts, and
evaporates, again and again, without EVER
becoming a new substance, correct?
So…
Just like the Study Jam said:
And…
The Study Jam said…
So…
Changing state of matter is NOT making a
new substance/chemical change.
3.) Chopping wood results in a
new material with different
properties. Agree? Explain.
TURN AND TALK! WHAT DO YOU THINK?
The science you need to know to answer
this homework question:
The answer lies in the crackers in the Study
Jam!
BURNT Crackers =
Molecules NEW
SUBSTANCE/
Different
Molecules
Broken
Crackers =
Molecules Stay
the Same
Cutting wood
smaller
doesn’t stop it
from being
wood!
4.) When a candle burns, the wick
of the candle and the wax turn into
nothing. Agree? Explain.
TURN AND TALK! WHAT DO YOU THINK?
The science you need to know to answer
this homework question:
First think about burning the candle and
decide if burning a candle is a chemical
change or physical change? Talk about THAT
with a partner.
Watch the video. See if it gives you any
clues about the candle question.
Watch the video. See if it gives you any
clues about the candle question.
So…
What conclusions should you draw about the
candle question?
Will the candle burning, a chemical reaction,
like in the two videos, burn away to nothing?
In both videos, no mass was lost in the
reaction. When we made butter, no mass was
lost in the chemical change of making butter.
SCIENCE NOTEBOOK TIME!-You HAVE to know this!
The Law of Conservation of Mass
Matter cannot be created or destroyed, so
in a chemical reaction , the mass of the
products equals the mass of the reactants.
The mass of the stuff you put into your
reaction = the mass of the stuff you get out
of your reaction IF you can find a way to
contain it in a CLOSED SYSTEM!
SCIENCE NOTEBOOK TIME!-You HAVE to know this!
If the reaction is one in which gas is
released, you will need a closed system to
maintain the mass.
The matter in a candle never just “TURNS
INTO NOTHING” because you can never
destroy matter (or energy, but we’ll get to
that later).
If you could capture all the matter that
burns when you burn a candle and find the
mass before and after, the mass would be
exactly the same. The gas that burns off
escapes into the atmosphere, but it’s still
there. It’s not NOTHING!
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HOMEWORK IN
YOUR SCIENCE
SPECIAL SPOT
RIGHT NOW!