1. What evidence do you have for chemical change in each reaction?
2. Account for the change in mass in each reaction.
3. What characteristics do the reactions have in common?
4. Write a word equation to summarize what happened in each of the chemical changes.
5. Write a symbol equation for the reaction that took place. Look up the formulas if necessary.
6. This type of reaction is sometimes called synthesis or combination. Explain why this is an appropriate name.

Part II

Answer Questions 1-5 (from Part I) for these two reactions.
6. This type of reaction is called decomposition. Explain why this is an appropriate name.

Part III

Answer Questions 1 and 3-5 (from Part I) for these reactions.
6. This type of reaction is called single replacement. Again, explain why this is a good name.

Part IV

Answer Questions 1 and 3-5 (from Part I) for these reactions.
6. This type of reaction is called double replacement. Explain why this is a good name.

Implications and Applications

1. Classify the following reactions as single replacement, double replacement, synthesis or decomposition.
   a. NaCl(aq) + AgNO ₃ (aq) ---> AgCl(s) + NaNO ₃ (aq)
   b. 2Mg(s) + O ₂ (g) ---> 2MgO(s)
   c. 2HgO(s) ---> 2Hg(l) + O ₂ (g)
   d. 2Al(s) + 3CuSO ₄ (aq)---> Al ₂ (SO ₄ ) ₃ (aq) + 3Cu(s)
   
2. Is it generally possible to classify a chemical reaction from observable evidence? Explain.
3. What other information would be helpful in classifying reactions?

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