Memorize these concepts Again, MEMORIZE THESE CONCEPTS!
There
are several types of reactions that are predictable and work similarly whenever you see them. Knowing these reactions is imperative to understanding how to predict what will happen in certain situations. To get these right you must start studying these tonight and every night until test time!
Single
Displacement (AKA Single Replacement) AB + C CB + A This reaction takes one element in a compound and switches it with another element. Examples: 2Na + 2H2O 2NaOH + H2 2Zn + 2HCl 2ZnCl + H2
Double
Displacement (AKA Double Replacement) AB + CD AD + CB In this reaction, 2 elements switch places to make 2 new compounds. Examples: MgCl2 + 2NaBr MgBr2 + 2NaCl Li2S + K2O Li2O + K2S
Combustion
reaction, burning, remember burning requires Oxygen (O2) Organic Compound (compound with carbon) + O2 CO2 + H2O Most organic compounds will have 2 elements (binary compounds) with C and H. For example CH4, C2H6, C3H8 Examples CH4 + 2O2 CO2 + 2H2O 2C4H10 + 9O2 8CO2 + 10H2O
Synthesis
Reaction (AKA combination reaction), putting 2 things together to make one. A + B AB Synthesis means creating something so these reactions are simply making something. Examples: 2H2 + O2 2H2O 2Na + Cl2 2NaCl
Decomposition
Reaction, opposite of synthesis, breaking something apart. AB A + B Decomposition means breaking things down or decomposing into the things that make it up. Examples: 2H2O 2H2 + O2 2NaCl 2Na + Cl2
Neutralization
reactions, when an acid is neutralized by a base. Acid + Base Salt + Water Acids usually have H and a nonmetal (HCl) and bases usually have a metal and an OH (KOH, NaOH) Examples: HCl + NaOH NaCl + H2O HBr + KOH KBr + H2O
Single
Replacement: AB + C CB + A Double Replacement: AB + CD AD + CB Combustion: Carbon + O2 CO2 + H2O Synthesis: A + B AB Decomposition: AB A + B Neutralization: Acid + Base Salt + Water
We
will have many examples to see… STUDY! MEMORIZE THESE… YES ALL OF THEM