During class we recalled the chemical reactions that we learned last year in science 10: Syntheis, decomposition and single replacement.
Synthesis: This is when one compound combines with another compound to create a more complicated one. The formula would be: Compound A + Compound B = Compound C
8 Fe + S8 ---> 8 FeS
Decomposition: Opposite of a synthesis reaction. A complicated compound breaks down into simpler ones. The formula would be: Complicated C = Compound A + Compound B
2 H2O ---> 2 H2 + O2
Single Replacement: This is when one element trades places with element in a compound: The formula would be A + BC = AC + B OR A +BC = BC + A
Mg + 2 H2O ---> Mg(OH)2 + H2
Here are some practice problems: