Grab binders, handouts & returned work & begin the Do Now
4/17 Do Now
1. Set you Periodic Tables at the corner of your
desk for it to be checked by Ms. Herndon
2. Turn in your completed EXIT TICKET 2 & HW
1 to the class bucket.
3. Take 5 minutes to prepare for today’s quiz on
bonding & chemical vs. physical reactions &
properties
Quiz 1
• 45 min to complete (we will track immediately
after)
• DO NOT write on the quiz, write answers on
separate sheet of paper
• When finished turn in the quiz upfront, grab a
colored pencil & calculator, and sit silently.
– Things to Do:
• HW 2
• Lab 1: Copper Cycle Lab Report
• Other course work
Reaction Equation Recap:
Phases
2H2O2(aq)  2H2O(l) + O2(g)
Reactants
Products
- 1 reactant, 2 products
- Chemical rxn NOT physical rxn
What types of chemical reactions are
there?
Determining Types of Chemical
Reactions
• Arrange the slips into groups
• HINT: There are 5 groups with 3 slips in each
• Questions to consider:
– What are your reactants and products?
– How many reactants are there?
– How many products are there?
– Consider how the different reactions differ and
how they are similar
Decomposition (8, 9, 14)
• Description: a compound breaks down to
simpler products
• General Equation:
AB  A + B
• Example:
2NaCl  2Na + Cl2
• Question: More products than reactants?
Synthesis (6, 11, 13)
• Description: 2 or more simpler reactants
join to form a compound
• General Equation:
A + B  AB
• Example:
2Na + Cl2 2NaCl
Question: More reactants than products?
Single Exchange (3, 7, 15)
• Description: a single atom replaces
another atom in a compound
• General Equation:
A + BC  AC + B
• Example:
2Na + CuCl 2NaCl + Cu
Question: Do we see a single element on
both sides?
Double Exchange (2, 4, 12)
• Description: atoms in compounds switch
partners and end with 2 new compounds
• General Equation:
AB + CD  AD + BC
• Example:
NaCl + LiBr NaBr + LiCl
Question: 2 compounds of reactants and as
products?
Combustion (1, 5, 10)
• Description: a CH compound burns in O2
to form CO2 and H2O (water)
• Example:
C2H4 + 3O2 2CO2 + 2H2O
Question: are CO2 and H2O products?
Counting Atoms in Compounds
Step 1:
Identify your elements in the compound
Step 2:
Distribute your subscripts
Step 3:
Distribute your coefficients across all elements
a. 4PO4
b. 6C3H8O2
c. (CH4) 2N2
Counting Atoms Guided Practice

How many atoms of each element are in the
following molecules?
1.
2.
3.
4.
5.
H2SO4
CaOH2
NaCl
(NH3)3PO4
3H2O
Answers





1. 2 hydrogen, 1 sulfur, 4 oxygen
2. 1 calcium, 1 oxygen, 2 hydrogen
3. 1 sodium, 1 chlorine
4. 3 nitrogen, 9 hydrogen, 1
phosphorus, 4 oxygen
5. 6 hydrogen, 3 oxygen