understanding & balancing chemical equations; review of the periodic table

1. C H E M I S T R Y R E V I E W:
Chemical Equations
ppt. by Robin D. Seamon

2. C H E M I C A L E Q U A T I O N S
2H O2
2H + O2 2
reactant product
coefficient
(how many
molecules)
subscript
(how many
atoms)
gasgas water

3. REACTANTS
1 C atom
4 H atoms
4 O atoms
PRODUCTS
1 C atom
4 H atoms
4 O atoms
Law of Conservation of matter: matter is neither
created or destroyed (Mass stays the same)
22

4. C H A N G E S
Physical change: the matter changes shape;
atoms stay the same substance
• Liquid water freezes
• Paper is torn

5. Chemical change: the atoms in the matter
rearrange; become a new substance
• Wood burns char ash & smoke
• Iron nail oxidizes rust
C H 0 + 10 CH 050 10 2
6C H 0 + HEAT10 15 7
2Fe O2 3
4Fe + 3 02

7. P E R I O D I C T A B L E R E V I E W

8. 1
1
2
3 4 5 6 7 8 9 10 11 12
1
3
14 15 16 17
18
Groups-
Families
Color of the
symbol indicates
whether the
element is a solid,
liquid, or gas at
room
temperature
Periodic
Table SONG
LINK
INTERACTIVE Periodic
TABLE
Metalloids are
on the stair-
step between
metals & non-
metals
Elements 1-92
are found in
Nature. The
rest are man-
made
(synthetic)
Periods

9. 1
1
2
3 4 5 6 7 8 9 10 11 12
13 14 15 16 17
18
How many
valence
electrons?
Group 1
Group 2
Group 13
Group 16
Group 17
Group 18
Which
two groups
would most
likely pair
together?
What is the
octet rule?
How many shells?
H N
Be Cl
Sr Br
R E V I E W Q U I Z
What are
shells?
What are
valence
electrons?
1 2
3 4
5 6
7
8
9
10
11
12
13
14
15
16
ANSWERS
1 2
2 3
5 4
Number of rings
of electrons
around the
nucleus
Number of
electrons in
outer share;
bonding
electrons
Bonding atoms
must add up to
8
1
2
3
6
7
8
1 & 17

10. NEW PERIODIC TABLE SONG (3 min) LINK