2011年1月29日星期六

TYPES OF REACTIONS (1)

There are 6 generlized types of reactions: Synthesis, Decomposition, Single Replacement, Double Replacement, Combustion, and Neutralization.

A: Synthesis
A synthesis reaction is a reaction that combines two or more reactions to form one product.
  • general formula: A+B→C

B: Decomposition
A decomposition reaction is a reaction that breakes down one reactant into two or more products.
  • general formula: A→B+C

C: Single Replacement
A single replacement reaction is one where an element replaces an ion in an ionic compound.  Metal elements replace positive ions (cations) and non-metal elements replace negative ions (anions).
  • general formula: (A=metal) A+BC→AC+B
  • general formula: (A=non-metal) A+BC→BA+C

Predicting Single Replacement Reactions
-Some metals are mpre reactive than other metals, and similarly some non-metals are more reactive than other non-metals.

-Using the "Activity Series" -An element higher up on the series replaces the ion below it on the table.



ACTIVITY SERIES:
METALS                                                                                                         NON-METALS
                                                                      Decresing Activity
lithium                                                                         ↓                                            fluorine
potassium                                                                  ↓                                            chlorine
calcium                                                                       ↓                                            bromine
sodium                                                                       ↓                                             iodine
magnesium                                                                ↓                                   
aluminum                                                                    ↓
zinc                                                                              ↓
chromium                                                                    ↓
iron                                                                              ↓
nickel                                                                          ↓
tin                                                                                ↓
lead                                                                            ↓
hydrogen                                                                    ↓
copper                                                                        ↓
silver                                                                           ↓
mercury                                                                      ↓
platinum                                                                     ↓
gold                                                                            ↓


Question:
How to get copper sulphate (CuSO4) if copper is less reactive than hydrogen and cannot replace it out from a acid (cannot react with surfuric acid)?


 

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