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The Language of Chemistry

Chemical Reactions

Atoms are re-arranged during a chemical reaction, they are not changed by the reaction.

A chemical reaction is shown like this:
....

reactant(s)

product(s)

 

The arrow represents the reaction taking place.

 

The reaction shown below represents the element carbon burning in air. It combines with the oxygen gas in the air to make carbon dioxide gas.

+


HEAT

One atom of carbon (4 bonding arms) reacts with one molecule of oxygen gas) The carbon and oxygen gas need to be heated together for this reaction to proceed. During the reaction the two oxygen atoms were separated and then joined to the carbon atom.

In the next example nitrogen gas reacted with hydrogen gas to form ammonia gas.

   

+

   


HEAT

 

 
One molecule of nitrogen gas reacts with three molecules of hydrogen gas. These gases need to be heated together for the reaction to proceed. The reaction produces two molecules of ammonia gas.

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