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Generation Date: 04/01/2014
Generated By: Che ryl Shelton
Title: 11th Grade Chemistry Chemical Reactions
1. A solution of barium chloride (BaCl2 ) is mixed with a solution of sodium sulfate (Na2 SO4 ).
What precipitate will form in the reaction?
A. NaCl
B. BaSO 4
C. Cl2 and SO 2
D. BaSO 4 and NaCl
2. Which of the following shows a correct oxidation half reaction?
A. Fe + 2eB. Fe2+
Fe2+
2Fe + 2e-
C. Fe2+ + 2e- Fe
D. Fe Fe2+ + 2e3.
Consider the following balanced equation:
Sn2+ + 2Fe3+
Sn4+ + 2Fe2+
Which of the following shows the correct oxidation and reduction half reactions?
A. Oxidation: 2Fe3+ + 2eB. Oxidation: Sn2+
Sn4+ + 2e-
C. Oxidation: Sn2+ + 2eD. Oxidation: 2Fe3+
2Fe2+ Reduction: Sn2+
Sn4+
Sn4+ + 2e-
Reduction: 2Fe3+ + 2eReduction: 2Fe3+
2Fe2+
2Fe2+ + 2e-
2Fe2+ + 2e- Reduction: Sn2+ + 2e-
Sn4+
4. A solution of calcium nitrate (Ca(NO 3 )2 ) is mixed with a solution of lithium carbonate
(Li3 CO3 ). What precipitate will form in the reaction?
A. A precipitate will not form.
B. CaCO3
C. CaCO3 and LiNO 3
D. LiNO 3
5. Identify which of the following reactions is/are (a) combustion reaction(s).
A. CH4 + 2O 2
B. 2Mg + O2
C. 2Na + Cl2
CO 2 + 2H2O
2MgO
2NaCl
A. Only reaction A is an example of a combustion reaction.
B. Only reaction C is an example of combustion reaction.
C. Only reaction B is an example of combustion reaction.
D. Reactions A and B are examples of combustion reactions.
6. Hydrocarbons, such as methane (CH4 ) or propane (C 3 H8 ), are chemical compounds that
contain carbon and hydrogen. When a hydrocarbon undergoes combustion, it reacts with
and produces
.
A. oxygen; carbon dioxide and water
B. carbon dioxide; oxygen and water
C. oxygen and carbon dioxide; water
D. carbon dioxide and water; oxygen
7. When bread is baked in the oven, which of the following is the most obvious indication that a
chemical reaction is occurring?
A. a change in mass
B. a change in state of matter
C. a change in color
D. a change in density
8. When a strip of zinc metal is dropped into a tube of hydrochloric acid, bubbles form, the tube
gets hot, and a silvery powder falls to the bottom of the tube, but the tube remains clear. Which
of the following is present in this reaction to indicate that a chemical reaction is occurring?
I. the formation of a precipitate
II. the emission or uptake of heat
III. the formation of a gas
IV. a change in color
A. I and II only
B. II and III only
C. I, II, and III only
D. II, III, and IV only
9. Consider the following equation:
2Fe3+ + Xe-
2Fe2+
Which number should replace the X to create a balanced equation?
A. 1
B. 2
C. 4
D. 3
10.
Consider the following balanced equation:
Cu + 4H+ + 2NO 3 -
Cu2+ + 2NO 2 + 2H2O
The reactant atoms are copper, hydrogen, nitrogen, and oxygen. Which reactant atom was
oxidized in the reaction?
A. oxygen
B. nitrogen
C. hydrogen
D. copper
11. What will indicate the occurrence of a chemical change in the following reaction?
Mg(NO 3 )2 + 2NaOH
Mg(OH)2 + 2NaNO3
A. color change
B. evolution of a gas
C. increase in volume
D. formation of a precipitate
12. Two clear salt solutions are combined and mixed. Which of the following changes would
indicate that a chemical change has occurred?
A. The density of the solution changes.
B. The color of the solution changes.
C. The volume of the solution increases.
D. The mass of the solution increases.
13.
Consider the following balanced equation:
H2 SO3 + 2Mn + 4H+
S + 2Mn2+ + 3H2 O
The reactant atoms are hydrogen, sulfur, oxygen, and manganese. Which reactant atom was
reduced in the reaction?
A. oxygen
B. hydrogen
C. manganese
D. sulfur
14. In the permanganate ion MnO 4 -, the oxidation number of each oxygen atom is -2. What is the
oxidation number of the manganese ion?
A. +2
B. +1
C. +8
D. +7
15. Ozone is a strong oxidizing agent that is used to purify water. Which of the following
statements best describes ozone?
A. It is neither oxidized nor reduced.
B. It is easily reduced.
C. It is easily oxidized.
D. It is difficult to reduce.
16.
An electrolytic cell uses electrical energy to cause an oxidation-reduction reaction to occur.
These cells contain two electrodes placed in a molten salt or solution. When electricity is
applied, the reaction begins. Positive ions are attracted towards the negative electrode and are
reduced, while negative ions are attracted to the positive electrode and are oxidized. For
example, a solution of molten sodium chloride gets decomposed into its component elements as
shown in the equation below:
2NaCl
2Na + Cl2
Which of the following statements is true?
A. both the sodium and chloride ions will be attracted to the negative electrode
B. chloride ions will be attracted to the negative electrode
C. sodium ions will be attracted to the negative electrode
D. both the sodium and chloride ions will be attracted to the positive electrode
17. The balanced chemical equation for the combustion of butane is:
A. 2C H + 5O
2 2
2
B.
C4 H10 + 12O2
C. 2CH + 5O
4
2
CO2 + 2H2 O
4CO 2 + 5H2O
2CO2 + 4H2 O
D.
2C4 H10 + 13O2
8CO 2 + 10H2O
18. When NH4 SCN is added to a solution of Fe3+ ions, the solution changes from yellow to
orange. What is the best explanation for this color change?
A. The concentration of Fe3+ ions increases, causing the solution to darken.
B. The reaction produces ammonia and hydrogen gases which cause a color change.
C. The reaction between NH4 SCN and Fe3+ results in an orange product.
D. The reaction releases heat, which causes the solution to change color.
19. What happens to the element iron in the following reaction?
Sn2+ + 2Fe3+
Sn4+ + 2Fe2+
A. It is reduced and its oxidation number changes from +2 to +3.
B. It is oxidized and its oxidation number changes from +2 to +3.
C. It is oxidized and its oxidation number changes from +3 to +2.
D. It is reduced and its oxidation number changes from +3 to +2.
20. Consider the following balanced equation:
Zn + 2H+
Zn2+ + H2
Which elements have oxidation numbers of zero?
A. Zn, H+, and each hydrogen atom in H2
B. Zn and each hydrogen atom in H2
C. H+ only
D. Zn only
21. A salt solution containing barium ions (Ba2+) was separately treated with solutions of HBr,
H2 SO4 , HNO 3 , and HCl. Which of these mixtures would produce a precipitate?
A. HCl
B. HNO 3
C. HBr
D. H2 SO4
22. Consider the following balanced equation:
CH4 + 2O2
CO2 + 2H2O
H = -802 kJ
Which of the following correctly describes this reaction?
A. It is endothermic and absorbs heat.
B. It is exothermic and absorbs heat.
C. It is exothermic and releases heat.
D. It is endothermic and releases heat.
23. A reaction takes place and the gas produced is bubbled through a solution of lime water. A
solid white precipitate forms. Which gas did the reaction produce?
A. SO 2
B. CO 2
C. H2
D. O 2