Name: _________________________
Date: _____________________________
How Can Matter Change?
Questions
Notes
1. What are the two ● A ​physical​ ​change​ is when _________________________________
ways matter can
change?
___________________________________________________________
● A ​chemical​ ​change​ is when _________________________________
___________________________________________________________
2. What are the
clues a chemical
change has
occurred?
There are four clues that a chemical change is happening…
1. _________________________________________________________
2. _________________________________________________________
3. _________________________________________________________
4. _________________________________________________________
STOP AND JOT
Decide if each of the following are physical (P) or chemical (C) changes.
Keep in mind the clues that a chemical change has occurred.
3. What is a
chemical reaction?
● A chemical change is also called a ______________
______________. In a chemical reaction, _________ between atoms
are broken or created to make something new
● Chemists use a chemical _________________ to show the
combinations of atoms in a chemical reaction
● Subscripts tell you the number of _________ in a molecule
● Coefficients tell you the number of ____________
● To count the number of atoms you have to ______________
coefficients by subscripts
STOP AND JOT
Determine the number of each type of atom in the reactants and products
for the following chemical equation:
# of Atoms in Reactants
H
C
O
# of Atoms in Products
4. What is the law
of conservation of
mass?
● The ___________________________________________________
states that matter cannot be ______________ or ________________
in a chemical reaction.
● The number of each type of ___________ on the _________________
side must be the same as on the ______________ side
( _______________)
STOP AND JOT
Directions: Check to see if the following chemical equations are balanced by
counting the atoms on the reactant and product sides of the equation.
1. 4Fe + 3O​2​ → 2Fe​2​O​3
R
P
Fe
O
2. P​4​O​10​ + 6H​2​O → 4H​3​PO​4
R
P
P
O
H
Summary
Matter can change through _______________ or _______________
changes. A physical change does not make something __________, but a
chemical change does make something new. A chemical change is also
called a chemical _________________. In a chemical change or reaction,
______ between atoms are broken and created to make something new.
The things that go into the chemical reaction are called _______________,
and the things that come out are called _______________. Even though
matter can change, it cannot be ________________ or ______________.
This is called the law of ______________________ ____ ____________.