17.1 Stanford Notes – Chemical Reactions
MAIN POINTS: Write a sentence summary of the
main point of each paragraph on the below pages.
Page 383
1.
Name ____________
Questions: Questions you should be able to
answer after reading.
1) What are the key questions for this unit?
2) What has to happen for a chemical change to
occur?
3) Why do we care about new compounds?
Page 384
1) What are physical properties?
1.
2) A chemical change involves what?
2.
3.
Chemical changes occur when new compounds or
molecules are created. Physical changes occur
when there is a change in size, shape or state
(soilid, liquid or gas) but no new molecules are
formed. For each of the following identify
whether each change is a chemical(C) or physical
(P) change:

When you mix baking soda and vinegar,
carbon dioxide is released.

You build a tall sand castle and it is turned
into a pile of sand by a big wave.

Boiling water turns into steam.

An egg is hardboiled.

Max divides a large amount of cookie dough
into small piles on a cookie sheet.
p. 385
1)
1) Define “Chemical Reaction”:
2) What happens when the bonds in CH4 are
broken?
2)
Vocab:
Chemical Reaction:
Precipitate:
p. 386
1.
3) How do you know if a chemical reaction has
occurred?
4) True/False:
a) Melting ice is a chemical change.
b) Frying an egg is a physical change.
c) You place pure sugar in a pan and heat it
up. It turns into a black substance.
Underline the products and circle the reactants
and identify if each is a solid, liquid, gas or
substance dissolved in H2O:
BaCO3(s) + HBr(aq)  BaBr2(aq) + H2O (l) + CO2(g)
2.
1) Define the following:
a) (s):
b) (l):
c) (g):
d) (aq):
3.
Vocab:
Reactant:
Product: