Synthesis Decomposition and Combustion Reactions Synthesis In a

Synthesis, Decomposition and Combustion Reactions

Synthesis In a simple synthesis reaction, two elements come together to form a compound Format: element + element compound § Must be able to predict Ex. Words: magnesium + oxygen magnesium oxide Formula: Mg + O 2 Mg. O § Practice: Al + Cl 2 _______ (Answer is not Al. Cl 2, look at ions) There also 2 other formats that you must be able to identify as synthesis, but do not have to predict § Format 1: element + smaller compound larger compound Ø § Ex. CO + O 2 CO 2 Format 2: smaller compound + smaller compound larger compound Ø Ex. Na 2 O +CO 2 ---> Na 2 CO 3

Decomposition In a simple decomposition reaction, one compound decomposes into two pure elements § Format: compound element + element Ex. Mg. O Mg + O 2 Practice: H 2 O _____ (answer is not H 2 + O) There are 2 other formats that you must be able to identify as synthesis, but do not have to predict § Format 1: larger compound element + smaller compound Ø § Ex. H 2 O 2 H 2 O + H 2 Format 2: larger compound smaller compound + smaller compound Ø Ex. NH 4 NO 3 N 2 O + H 2 O

Combustion In a combustion reaction, a hydrocarbon reacts with oxygen to make CO 2 and H 2 O Format: § § hydrocarbon + O 2 CO 2 + H 2 O Hydrocarbons contain C, H and O Examples of hydrocarbons: CH 4 (methane), C 3 H 8 O(isopropyl alcohol) Combustion § § Examples: CH 4 + O 2 CO 2 + H 2 O C 3 H 8 O + O 2 CO 2 + H 2 O Practice: C 8 H 18 + O 2