Sample Questions - Chemical Reactions

FIRST YEAR CHEMISTRY

Assessment Test

Sample Questions, Chemical Reactions

1. What is the formula of the reaction product when sodium reacts with iodine?

2. What are the formulas of the products when nitric acid, HNO₃, reacts with aluminum hydroxide, Al(OH)₃?

3. Give the formulas of the acid and the base that must be used to make the salt, (NH₄)₂SO₄.

4. Balance the equation for the reaction of copper(II) hydroxide, Cu(OH)₂, with hydrochloric acid, HCl.

5. Balance the following equation for the reaction of lithium with nitrogen (lowest whole number coefficients).

6. Balance the following equation for the reaction of iron with bromine (lowest whole number coefficients).

7. Balance the following equation for the reaction of iron(III) hydroxide with sulfuric acid.

8. Reactions may be classified in several ways, for example:

• Combination reaction
• Acid-base reaction
• Precipitate-forming reaction
• Gas-producing reaction
• Oxidation-reduction reaction
• Decomposition reaction

Give the types of each of the following reactions. Some reactions can be classified in more than one way; give all of the types that are applicable. Equations are not balanced. a. P₄O₆   (s) + O₂   (g) ---> P₄O₁₀   (s)

b. H₂SO₄   (aq) + Ba(NO₃)₂   (aq) ---> BaSO₄   (s) + HNO₃   (aq)

c. NH₄Cl (s) + NaOH (aq) ---> NaCl (aq) + H₂O (l) + NH₃   (g)

d. Al (s) + HCl (aq) ---> AlCl₃   (aq) + H₂   (g)

e. NO₂   (g) ---> NO (g) + O₂   (g)

f. Zn(OH)₂   (s) + HCl (aq) ---> ZnCl₂   (aq) + H₂O (l)

g. Na₂SO₄.10H₂O (s) ---> Na₂SO₄   (s) + H₂O (g)

h. Cu (s) + S₈   (s) ---> Cu₂S (s)

Answers

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Last revised: 16 Aug, 2006 by A. van der Est

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