Experiment 2

Experiment 2

 

Chemical Reactions

 

 

The copper reacts with oxygen in the air and becomes coated  with copper oxide.

Vinegar and lemon juice are acids, they dissolve the layer of copper oxide from the coin´s surface  making it clean again.

Antes

 

Después

 

 

 

 

 

Heat causes the lemon juice  to oxidise. This produces a dark compound and the   screet message is revealed.

 

 

 

 

 

           

 

 

                                  

 

 

 

 

Bleach contains the element chlorine. Chlorine reacts with wáter to reléase oxigen. The oxigen reacts with (oxidises) the compounds that give the dyes their color.

This changes the dyes so that they are no longer coloured.