Chemical Reactions
10 Coolest Chemical Reactions
• https://www.youtube.com/watch?v=0Bt6RPP
2ANI
Synthesis Reaction
• Synthesis – 2 substances (reactants) combine
to form a new substance (product).
– Substances are either atoms (elements) or
compounds in this case.
A +
B

AB
Decomposition Reactions
• Decomposition – A single compound breaks
into two or more simpler elements and/or
compounds.
AB

A
+
B
Single Replacement Reactions
• Single replacement reaction –
– Atoms from one element replace atoms from
another element (that is in a compound).
AB
+
C

AC
+
B
Double Replacement
• Double replacement reaction –
– Atoms in 2 compounds trade places.
AB
+
CD

AD
+
CB
Combustion Reaction
• In a combustion reaction a compound
combines with oxygen the yield carbon
dioxide and water.
C5H9O + O2
 CO2 + H2O
Balancing Chemical Reactions
• https://www.youtube.com/watch?v=_B735tur
DoM
Balancing Chemical Equations
• http://science.widener.edu/svb/tutorial/rxnba
lancingcsn7.html
Balancing Chemical Equations
1. Begin by taking an element “inventory” for
reactants and products.
2. Pick an element that only occurs once on each
side.
3. Determine which side (product or reactant) has
fewer of that element and put the coefficient
that will make each side equal in front of the
molecule that the element is in.
4. Update your inventory. (done when matches)
5. Repeat steps 2 through 4 until only elements
that occur more than once are left and balance
them.
Balancing Chemical Reactions
_____ Br2 + _____LiF  ____ LiBr + ____ F2
Reactants
Br = 2
Li = 1
F=1
Products
Br = 1
Li = 1
F=2
Balancing Chemical Reactions
_____ Br2 + _____LiF  __2__ LiBr + ____ F2
Starting with Br (2 are on reactant side, so put a 2 in front of LiBr on product side to
make Br equal on both sides)
Reactants
Br = 2
Li = 1
F=1
Products
Br = 1 2
Li = 1 2
F=2
Balancing Chemical Reactions
_____ Br2 + ___2__LiF  __2__ LiBr + ____ F2
Now fix Li on the reactant side (only one is there so
you need to increase it to 2 to match the product
side.)
Reactants
Products
Br = 2
Br = 1 2
Li = 1 2
Li = 1 2
F=1 2
F=2