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Chemical Changes

Answer the following questions.
(Use lower case only.)

 
  1) What is the type of change when a substance breaks down into simpler substances when heated? A good example of this is cracking hydrocarbons.  
       
 
  2) What do you get if you mix an acid with an alkali? (it's not a joke.)  
    and    
 
  3) What type of reaction is described in Q2?  
       
 
  4) What type of reaction is taking place when magnesium reacts with iron sulphate to create magnesium sulphate and iron?  
       
 
  5) Why does the magnesium take the place of the iron?  
    it is than iron   
 
  6) What type of reaction is taking place when two solutions react and a solid forms in the solution and sinks?  
       
 
  7) What is the name for the addition of oxygen, for example iron becoming iron oxide?  
       
 
  8) What is the name for the removal of oxygen, for example iron oxide becoming iron?  
       
 
  9) What does an exothermic reaction give out?  
    energy   
 
  10) What does an endothermic reaction need?  
    energy   
 
  11) What is the name for reactions that can go both ways?  
    (two words)   
 
  12) What is the name of the process for using electricity to cause a chemical change?  
       
 
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