1. Chemical Equations Physical Change:
-physical change is a change that merely changes the shape, volume, or phase of the substance (ie. gas, liquid, solid, plasma)
ex: H2O (s), H2O (l), H2O (g)
Nuclear Change:
-nuclear change is a change in the nucleus which completely changes the elements involved
-involves lots of energy
Chemical Change:
-chemical change is a change that fundamentally alters the composition of the substance
ex: H2O2 can turn into H2 and O2

2. Chemical Equations -reactants: things to be combined together
real life example: bread, meat, cheese
-arrow: indicates what the reactants become or
produces when they are put together
-products: things that are made when the reaction is
finished
real life example:
bread + meat + cheese  sandwich

3. Describe-An-Equation
CH3COOH (aq) + NaHCO3 (s)  CO2 (g) + H2O (l) + NaCH3COO (aq)
Using a descriptive paragraph, write down what is happening in the reaction above using the following words:
gas liquid aqueous solid acetic acid (CH3COOH)
sodium bicarbonate (NaHCO3) carbon dioxide (CO2) water (H2O)
reacts produces sodium acetate (NaCH3COO)

4. Types of Reactions

5. Chemical Equations Types of Reactions
-Decomposition reaction: one reactant is broken apart into two or more substances
Ex: AB  A + B
H2O2 (l)  H2O(g) + O2 (g)
-Combination/Synthesis reaction: two or more substances combine to form a single product
Ex: A + B  AB
H2O (g) + O2 (g)  H2O2 (l)

6. Chemical Equations Types of Reactions
-Single Exchange: starts with an element and a compound. The compound breaks apart and one piece combines with element while other piece is left in elemental form.
Ex: AB + C  AC + B
Cl2 + CaI2  CaCl2 + I2
Mg + 2HCl  MgCl2 + H2

7. Chemical Equations Types of Reactions
-Double Exchange: starts with two compounds that break apart. The parts recombine into two new products.
Ex: AB + CD  AD + CB
CsF + NaOH  NaF + CsOH
PbI2 + K2S  PbS + 2KI

8. Chemical Equations Types of Reactions
-Combustion: starts with two compounds that break apart. The parts recombine into two new products.
Ex: CXHX + O2  CO2 + H2O
C3H8 + 5O2  3CO2 + 4H2O (propane)
2C4H O2  8CO2 + 10H2O (butane)
propane fire pit