How Can We Describe Chemical Reactions?
Chemistry Unit 8: Homework Packet
Name:______________________
________/ 140pts
New Skills
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Identify different types of reactions
Balance chemical reactions
Predict solubility and replacement reactions
Write net-ionic equations
8.1 Reactions and Equations – Chemical reactions are represented by balanced
chemical equations
1. Recognize evidence of chemical change.
a. (3pts) What is a chemical reaction?
b. (3pts) Name three examples of evidence that a chemical reaction has
occurred?
2. Represent chemical reactions with equations.
a. (3pts) What is a chemical equation?
b. (6pts) What are the three main parts of a chemical reaction? Briefly
describe or give examples of each.
c. (3pts) How does a skeleton equation differ from the balanced chemical
equation?
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3. Balance chemical equations.
a. (6pts) What are the six basic steps to balancing an equation?
i.
ii.
iii.
iv.
v.
vi.
b. Balance the following reactions:
i. (4pts) Aqueous sodium phosphate and aqueous strontium fluoride
mix to yield solid strontium phosphate and aqueous sodium
fluoride.
ii. (4pts) Aqueous sodium hydroxide and aqueous hydrochloric acid
mix to yield liquid water and aqueous sodium chloride.
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8.2 Classifying Chemical Reactions – There are four types of chemical reactions:
synthesis, combustion, decomposition, and replacement reactions. Some reactions can fit
more than one reaction type.
1. Classify chemical reactions
a. (8pts) What are the four main types of chemical reactions? Give an
example of each (Can use A,B and C…etc.).
i.
ii.
iii.
iv.
2. Identify the characteristics of different classes of chemical reactions.
a. (8pts) List the common characteristics that help identify each of the
reactions you listed above.
i.
ii.
iii.
iv.
b. (4pts) What is the activity Series and how do we use it?
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c. (10pts) Will the following reactions take place? If so, what are the
products? Be sure to balance the final reaction.
i.
Cu(s) + NaCl(aq) 
ii.
Mg(s) +
CuSO4(aq) 
iii.
Fe(s) +
Al(NO3)3(aq) 
iv.
Cl2(g) +
CuBr2(aq) 
v.
Br2(l) +
LiF(aq) 
d. (3pts) What are the three common types of products produced in a
metathesis reaction?
8.3 Solubility - When solutions containing ionic substances are mixed, ions
interchange and can form solids.
1. Identify new possible ionic compounds in a reaction.
a. (12pts) Write the predicted possible products for the following reactions
(states not needed but be sure to balance the final reaction):
i.
NaCl(aq) + Ca(NO3)2(aq) 
ii.
AgNO3(aq) +
NaCl(aq) 
iii.
FeSO4(aq) +
KOH(aq) 
iv.
Na3PO4(aq) +
CuSO4(aq) 
2. Define the terms soluble and insoluble
a. (3pts) What does the term soluble mean and how is it represented with a
symbol in a chemical reaction?
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b. (3pts) What does the term insoluble mean and how is it represented with
a symbol in a chemical reaction?
3. Predict solids based on solubility rules
a. (12pts) Use the reactions from the previous problem and predict the
products and the state of the products (be sure to the final reaction is
balanced).
i.
NaCl(aq) +
Ca(NO3)2(aq) 
ii.
AgNO3(aq) +
iii.
FeSO4(aq) +
iv.
Na3PO4(aq) +
NaCl(aq) 
KOH(aq) 
CuSO4(aq) 
8.4 Reactions in aqueous solutions - Double –replacement reactions occur
between substances in aqueous solutions and produce precipitates, water, or gases.
1. Describe aqueous solutions
a. (2pts) What does aqueous mean?
b. (4pts) What two things make up a solution?
2. Write complete ionic and net ionic equations for chemical reactions in aqueous
solutions.
a. (12pts) Write the complete and net ionic equations for the following
chemical reactions in aqueous solutions. Be sure to include coefficients
where needed:
i.
NaCl(aq) + Ca(NO3)2(aq) 
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ii. AgNO3(aq) + NaCl(aq) 
iii. FeSO4(aq) + KOH(aq) 
iv. Na3PO4(aq) + CuSO4(aq) 
b. (3pts) What are spectator ions and what do they do?
3. Predict whether reactions in aqueous solutions will produce a precipitate,
water, or a gas.
a. (12pts) Each of the following reactions produce a gas, water or a
precipitate. Please predict the products of the following reactions by
finishing the equation complete with states and coefficients.
i.
NaOH(aq) +
H2SO4(aq) 
ii.
HF(aq) +
NaHCO3(aq) 
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iii.
HCl(aq) +
iv.
Pb(NO3)(aq) +
Li2S(aq) 
K2SO4(aq) 
8.5 Accumulating Content and Skills:– Chemistry content is continuous and
builds on prior knowledge and skills. This section will combine this unit with previous
units.
1. Apply knowledge and skills from previous units to content learned in this unit.
a. (4pts) Why do polyatomic ions stay intact in an aqueous solution?
b. (4pts) How do naming rules change when working with gases vs. aqueous
acids?
c. (4pts) How does lattice energy relate to solubility rules?
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