1. Understanding Chemical Reactions
Chapter 6 test review
Understanding Chemical Reactions

2. Sections We’ve Covered
Section Word Equations
Section Law of Conservation of Mass
Section Balancing Chemical Equations
Section Combustion
Section Synthesis & Decomposition Reactions
Section Single & Double Displacement Reactions

3. Section 6.1 – Word Equations
A chemical reaction is represented by the following word equation:
magnesium + sulfuric acid —> hydrogen + magnesium sulfate
(a) What are the products of this reaction?
(b) What are the reactants in this reaction?
Write word equations for the following chemical reactions.
(a) Tarnish (Ag2S) forms when a silver spoon is placed in sulfur.
(b) KOH and H2 result when H2O and potassium are mixed.

4. Section 6.3 – Conservation of Mass
In all chemical reactions the:
(a) mass and volume of both the reactants and the products must be equal.
(b) masses of the combining chemicals must be equal.
(c) volume of the reactants equals the volume of the products.
(d) volumes of the combining reactants must be equal.
(e) mass of the reactants equals the mass of the products.

5. Section 6.5 – Balancing Chemical Equations
Balance the following equation:
Cu + H2SO4 —> CuSO H2O + SO2

6. Section Combustion
(a) Complete the following equation and balance it.
C4H8 + O2 —> ________________
(b) Classify the reaction type
Answer
(a) C4H8 + 6O2 —>4CO2 + 4H2O

7. Section 6.7 Synthesis & Decomposition Reactions
Balance and classify each of the following as either a synthesis or a decomposition reaction.
(a) HgO —> Hg + O2
(b) Al + O2 —> Al2O3
(c) SO3 + H2O —> H2SO4
Answer
(a) 2HgO —> 2Hg + O decomposition
(b) 4Al +3 O2 —> 2Al2O3 synthesis
(c) SO3 + H2O —> H2SO4 synthesis

8. Section 6.10 Single & Double Displacement Reactions
Classify each of the following reactions.
(a) 2KI + Pb(NO3)2 —> PbI2 + KNO2
(b) Fe + CuSO4 —> Cu + FeSO4
(c) 2Li + H2O —> 2LiOH + H2
(d) Ca(OH)2 + 2HBr —> 2H2O + CaBr2
Answer
(a) double displacement
(b) single displacement
(c) single displacement
(d) double displacement

9. Test Format Multiple Choice Fill in the Blanks Short Answer
Write skeleton equation, balance, state reaction type.

10. Please Complete Chapter 6 Review Questions
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