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Which of the following is a chemical reaction?

  1. I am confuse here.Here is another question from my test.

    Which of the following is a chemical reaction?

    I.A piece of gold is being heated to melt it
    II.A ball is being blown
    III.A piece of paper is burnt
    IV.A piece of sodium is out into a beaker of water

    A.I and II
    B.III and IV
    C.I,II,and IV
    D.I,II,III,and IV

    I am absolutely clueless about this question.Can a good samaritan help out here?
     
  2. jcsd
  3. Type in "chemical and physical changes" at your favorite search engine. That should give you mucho leads, including the differences between the two.

    Best of luck.

    Steve
     
  4. What is a chemical reaction defined as? What is a physical change defined as? The answer is quite simple if you know the definitions, if not its more complicated.
     
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