Answers

2014-07-30T21:14:39+05:30
The reactants colour will be differnate so when they react 2 each other mostly the will change 
 so by seeing we can identify that is a a change in colour 
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arre u dont understand my thing
by seeing it is nt the answer
firstly tell me one complete explanation of this question
ya
  • Brainly User
2014-07-31T12:27:39+05:30
If the substance is reactive and changes its color ....... note the color first after  the 2 substance finish reacting we see the color is different from the color we noted 
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