1. 8.2 NOTES Synthesis and Combustion

2. II. Classifying Chemical Reactions some reactions will fit into more than 1 category

3. Synthesis reactions; also called composition reactions
occurs when 2 or more reactants combine to form one product
can be simple (2 elements combine) or more complex (a compound and an element or two compounds)
when combining compounds; look for a possible polyatomic ion; complex synthesis rxns can sometimes be thought of as decomposition rxns in reverse;
MgO + CO2  MgCO3 - if it is known that metal carbonates produce metal oxides and CO2 then metal oxides and CO2 should be able to produce metallic carbonates

4. Model:
Example:

5. B. Combustion Reactions
Combustion reactions normally involve a substance reacting rapidly with oxygen gas, releasing heat and light.
Common; hydrocarbons (compounds containing H and C) burn to produce CO2 and H2O; production of water by reacting H2 and O2;
Uncommon: burning of coal yields the following: C + O2  CO2 ; O2 reacts with all reactants!
Sb2S3 + O2  Sb2O3 + SO2

6. Model: CxHy + O2  H2O + CO2
Example: