Chemistry: Matter and Change

Chapter 9: Chemical Reactions

Standardized Test Practice

1
In the following unbalanced chemical reaction, which components are classified as the reactants?

C7H16 + O2 → CO2 + H2O
A)C7H16 and O2
B)C7H16 and CO2
C)C7H16 and H2O
D)CO2 and H2O
2
In a chemical equation, the number written in front of the chemical formula is the _________.
A)reactant
B)product
C)equation
D)coefficient
3
Balance the following equation. What is the coefficient for hydrogen fluoride?

SiO2 + HF → SiF4 + H2O
A)1
B)2
C)3
D)4
4
Which of the following is not evidence of a chemical change?

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A)temperature change
B)melting
C)color change
D)appearance of a solid
5
How does the balanced chemical equation shown above demonstrate the conservation of mass?

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A)Some atoms get bigger while others get smaller.
B)It does not demonstrate the conservation of mass because the coefficients are not equal.
C)Solid atoms are more massive than gaseous atoms.
D)There are the same number of each atom on the left and right side of the equation.
6
Which of the following single-replacement reactions will occur?

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A)Br2(g) + HF(aq) →
B)Cl2(g) + HBr(aq) →
C)Au(s) + Cu(NO3)2 (aq) →
D)Cu(s) + ZnCl2(aq) →
7
What are the products of the reaction between barium hydroxide and hydrochloric acid?
A)barium chloride and water
B)barium hydroxide and water
C)barium chloride and barium hydride
D)chloric acid and barium
8
In the combustion reaction of propane, C3H8, what are the products?
A)C3H8 and O2
B)C3H8 and CO2
C)O2 and H2O
D)H2O and CO2
9
Sodium metal spontaneously reacts with water. What sort of chemical reaction does this represent?

2Na(s)+ 2H2O(l) → 2NaOH(aq) + H2(g)
A)single replacement
B)double replacement
C)synthesis
D)decomposition
10
Photosynthesis produces glucose from raw materials. What sort of reaction is photosynthesis?

6 CO2(g) + 6H2O(l) → C6H12O6(aq) + 6O2(g)
A)synthesis
B)decomposition
C)single replacement
D)double replacement
11
What is the complete ionic equation for the following chemical equation?

Cl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq)
A)Ba2+(aq) + Cl-(aq) + Na+(aq) + SO42-(aq) → Na+(aq) + Cl-(aq) + BaSO4(s)
B)Ba2+(aq) + 2Cl-(aq) + 2Na+(aq) + SO42-(aq) → 2Na+(aq) + 2Cl-(aq) + BaSO4(s)
C)BaCl2(aq) + 2Na+(aq) + SO42-(aq) → 2Na+(aq) + 2Cl-(aq) + BaSO4(s)
D)Ba2+(aq) + SO42-(aq) → BaSO4(s)
12
The components of a chemical equation that are left after the spectator ions are removed are the ____________.
A)spectator ions
B)reactants
C)products
D)participating ions
13
Na+(aq) is a _________________ in the following complete ionic equation.

H+(aq) + Cl-(aq) + Na+(aq) + OH-(aq) → Na+(aq) + Cl-(aq) + H2O(l)
A)participating ion
B)reacting compound
C)reacting molecule
D)spectator ion
14
What is the net ionic equation for the following reaction?

HNO3(aq) + K2S(aq) → H2S(g) + KNO3(aq)
A)H+(aq) + S2- → H2S(g)
B)H+(aq) + S2- → KNO3(aq)
C)NO3-(aq) + K+ → H2S(g)
D)NO3-(aq) + K+ → KNO3(aq)
15
What is the precipitate in the following reaction?

AgNO3(aq) + KCl(aq) → AgCl(s) + KNO3(aq)
A)AgNO3(aq)
B)KCl(aq)
C)AgCl(s)
D)KNO3(aq)
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