Chemistry Notes

Chemistry Chapter 9

1.     There are 5 basic types of chemical reactions, what are they? What happens in each type?

1.1.SYNTHESIS REACTION

Two or more reactants and one product.

A + X à AX 

      (+)  (-)      (+-)

2Na  + Cl₂ à 2NaCl

1.2.DECOMPOSITION

One Reactant will break into parts

AX à A + X

Na₂CO₃ à Na₂O + CO2

1.3.COMBUSTION

Carbohydrate

C₁₁H₂₂O₁₁ + O₂ à CO₂ + H₂O

Hydrocarbon

CH + O2 à CO2 + H₂O

1.4.SINGLE REPLACEMENT REACTION

A + BX à AX + B

+    +-      +-    +

Metal replaces metal, non-metal replaces non-metal, positive replaces positive

Mg + Pb(No₃)₂ à Mg (NO₃)₂ + Pb

           

USE THE ACTIVITY SERIES

*When you see a single replacement reaction…. Look at the element that is by itself, then look to see what element it is trying to replace… MAKE SURE the Single Element is more reactant (HIGHER ON THE ACTIVITY SERIES SHEET) If it is not…. Write NO REACTION.

1.5.DOUBLE REPLACEMENT REACTION

AX + BY à AY + BX

+-     +-      +-    +-

The positive ions change partners

HCl + CaCO₃ à H₂CO₃ + CaCl₂