Basic chemistry help for students and teachers

 

Interactive Chemistry Worksheets for Students

 

Periodic table

Naming compounds

Basic formula

Simple compounds

Ionic compounds 1

Ionic compounds 2

Chemical suffixes

Old chemical names

Hydrocarbons - Alkanes

Alkanes, alkenes & alkynes

Alkanols to alkanoic acids

 

Common compounds

Common formula quiz

Acids, bases and salts

Covalent compounds

Printable worksheets
 

 

Displacement reactions

Metals differ in their chemical reactivities. Magnesium is more reactive than zinc and zinc is more reactive than iron.

Metals can be placed in order of decreasing chemical activity. This is called the activity series of metals.


Activity series of metals

Metal ion Metal Symbol  
Mg2+ Magnesium Mg Most active metal
Zn2+ Zinc Na  
Fe2+ Iron Fe  
Pb2+ Lead Pb  
Cu2+ Copper Cu  
Ag+ Silver Ag Least active metal

 

An active metal will displace the ion of a less active metal from solution.

A metal higher on the table will react with a metal ion solution lower on the table.

An example of a displacement reaction is placing a piece of steel wool into a solution of copper sulfate.

Note: Don't use the commercial brands of steel wool that are protected from rusting. They will not react.

The steel wool is turned into pink copper wool. Over time the solution also loses its blue color and turns olive green.

Iron (steel wool) + Copper sulfate Iron sulfate + Copper

Fe + CuSO4 FeSO4 + Cu

Copper sulfate CuSO4 is blue

Iron(II) sulfate, FeSO4 is olive green

Copper metal, Cu is pink

 

The reaction is also exothermic producing heat.