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Write a balanced equation to represent the reaction shown in the figure. Write a balanced equation to represent the reaction shown in the figure. A) 4CH<sub>3</sub> + 6O<sub>2</sub> \rightarrow 4CO<sub>2</sub> + 6H<sub>2</sub>O B) 3CH<sub>4</sub> + 6O<sub>2</sub> \rightarrow 3CO<sub>2</sub> + 6H<sub>2</sub>O C) 3CH<sub>3</sub> + 6O<sub>2 </sub> \rightarrow 3CO<sub>2</sub> + 6H<sub>2</sub>O D) 3CH<sub>4</sub> + 5O<sub>2</sub> \rightarrow 3CO<sub>2</sub> + 5H<sub>2</sub>O E) 3CH<sub>4</sub> + 6O<sub>2</sub> \rightarrow 3CO + 6H<sub>2</sub>O


A) 4CH3 + 6O2 →\rightarrow 4CO2 + 6H2O
B) 3CH4 + 6O2 →\rightarrow 3CO2 + 6H2O
C) 3CH3 + 6O2 →\rightarrow 3CO2 + 6H2O
D) 3CH4 + 5O2 →\rightarrow 3CO2 + 5H2O
E) 3CH4 + 6O2 →\rightarrow 3CO + 6H2O

F) A) and D)
G) A) and B)

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Which of the following ionic compounds would be expected to be insoluble in water?


A) NH4NO3
B) PbI2
C) NaCH3CO2
D) KCl
E) CuSO4

F) C) and D)
G) D) and E)

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Identify the spectatorion(s) in the following reaction: Zn(s) + Cu(NO3) 2(aq) →\rightarrow Cu(s) + Zn(NO3) 2(aq)


A) Cu2+(aq) and NO3-(aq)
B) Zn2+(aq) and Cu2+(aq)
C) Zn2+(aq) and NO3-(aq)
D) NO3-(aq) only
E) There are no spectatorions.

F) All of the above
G) A) and B)

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After the following equation is properly balanced, what is the coefficient in front of O2? S8(s) + O2(g) →\rightarrow SO3(g)


A) 12
B) 8
C) 16
D) 3
E) 2

F) B) and D)
G) D) and E)

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If solutions of potassium chromate and calcium nitrate are mixed, will a double-displacement reaction occur? If so, what is the balanced equation for the reaction?


A) Yes.K2CrO4(aq) + Ca(NO3) 2(aq) →\rightarrow KNO3(aq) + CaCrO4(s)
B) Yes.K2CrO4(aq) + Ca(NO3) 2(aq) →\rightarrow KNO3(aq) + CaK(s)
C) No reaction will occur.
D) Yes.K2CrO4(aq) + Ca(NO3) 2(aq) →\rightarrow 2KNO3(aq) + CaCrO4(s)
E) Yes.K2CrO4(aq) + Ca(NO3) 2(aq) →\rightarrow K2(NO3) 2(aq) + CaCrO4(s)

F) A) and E)
G) A) and D)

Correct Answer

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When writing a net ionic equation, how would Mg(NO3) 2(aq) be represented?


A) Mg2+(aq) + (NO3) 2-(aq)
B) Mg2+(aq) + 2NO3-(aq)
C) Mg(aq) + N2(aq) + 3O2(aq)
D) Mg2+(aq) + 2N3-(aq) + 6O2-(aq)
E) Mg2+(aq) + NO3-(aq)

F) A) and D)
G) A) and B)

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Write and balance a net ionic equation for the reaction between iron(II) chloride and potassium hydroxide to form iron(II) hydroxide and potassium chloride.


A) Fe2Cl(aq) + OHˉ(aq) →\rightarrow FeOH(s) + Clˉ(aq)
B) Fe2+(aq) + 2OHˉ(aq) →\rightarrow Fe(OH) 2(s)
C) 2Clˉ(aq) + 2K+(aq) →\rightarrow 2KCl(s)
D) 2Clˉ(aq) + 2K+(aq) →\rightarrow 2K(s) + Cl2(g)
E) Fe2+(aq) + OHˉ(aq) →\rightarrow FeOH(s)

F) A) and B)
G) B) and E)

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Write and balance the equation for the combination reaction that occurs when solid potassium metal reacts with chlorine gas.


A) 2K(s) + Cl2(g) →\rightarrow KCl(s)
B) K(s) + Cl(g) →\rightarrow KCl(s)
C) 2K(s) + Cl2(g) →\rightarrow 2ClK(s)
D) 2K(s) + Cl2(g) →\rightarrow 2KCl(s)
E) K(s) + Cl2(g) →\rightarrow KCl(s)

F) A) and E)
G) B) and D)

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When one compound is converted into two elements during a chemical reaction, a decomposition reaction has occurred.

A) True
B) False

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Which of the metals (Fe, Zn, Mg) will react in an aqueous solution of Al(NO3) 3 to produce aluminum metal?


A) Zn
B) Mg
C) Fe
D) None of these
E) All of these

F) All of the above
G) B) and E)

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In the figure shown, is a chemical reaction occurring? In the figure shown, is a chemical reaction occurring? A) Yes, because the Na<sup>+</sup> and Cl<sup>-</sup> ions are being removed from their ionic lattice as they are dissolved. B) Yes, because the water molecules are reacting with the Na<sup>+</sup> and Cl<sup>-</sup> ions to form a gas. C) Yes, because a precipitate will be formed when the water and NaCl are mixed. D) No, because there is no change occurring. E) No, because the Na<sup>+</sup> and Cl<sup>-</sup> ions are simply being surrounded by the water molecules as the salt dissolves.


A) Yes, because the Na+ and Cl- ions are being removed from their ionic lattice as they are dissolved.
B) Yes, because the water molecules are reacting with the Na+ and Cl- ions to form a gas.
C) Yes, because a precipitate will be formed when the water and NaCl are mixed.
D) No, because there is no change occurring.
E) No, because the Na+ and Cl- ions are simply being surrounded by the water molecules as the salt dissolves.

F) A) and D)
G) B) and E)

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A solution of silver nitrate is mixed with a solution of sodium chloride, resulting in a precipitate of silver chloride and a solution of sodium nitrate.The class of this reaction is:


A) combination reaction.
B) double-displacement reaction.
C) decomposition reaction.
D) single-displacement reaction.
E) combustion reaction.

F) A) and D)
G) C) and D)

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Consider the following chemical equations.Select the equations that represent chemical reactions, rather than physical changes.


A) I, II, and III
B) I and II only
C) I and III only
D) I only
E) II and III only

F) None of the above
G) B) and C)

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Write and balance the equation for the decomposition reaction that occurs when solid copper(II) hydroxide, Cu(OH) 2, is heated.


A) Cu(OH) 2(s) →\rightarrow Cu(s) + (OH) 2(g)
B) Cu(OH) 2(s) →\rightarrow Cu(s) + 2OH(g)
C) 2Cu(OH) 2(s) →\rightarrow 2CuO(s) + H2O(g)
D) Cu(OH) 2(s) →\rightarrow Cu(s) + H2O(g)
E) Cu(OH) 2(s) →\rightarrow CuO(s) + H2O(g)

F) A) and B)
G) C) and E)

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When heated, calcium carbonate (limestone) undergoes a decomposition reaction.Write a balanced equation for this reaction.


A) CaCO3(s) →\rightarrow CaO(s) + CO2(g)
B) CaCO3(s) →\rightarrow Ca(s) + CO2(g)
C) 2CaCO3(s) →\rightarrow 2CaO(s) + 3CO2(g)
D) CaCO3(s) →\rightarrow Ca(s) + CO3(g)
E) 2CaCO3(s) →\rightarrow 2CaO(s) + CO2(g)

F) A) and E)
G) B) and D)

Correct Answer

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Write and balance the equation for the combination reaction that occurs when aluminum metal reacts with oxygen gas.


A) 4Al(s) + 3O2(g) →\rightarrow 2Al2O3(s)
B) 2Al(s) + 2O2(g) →\rightarrow 2AlO2(s)
C) 2Al(s) + 2O2(g) →\rightarrow Al2O3(s)
D) Al(s) + O2(g) →\rightarrow AlO(s)
E) Al(s) + O2(g) →\rightarrow AlO2(s)

F) A) and C)
G) A) and B)

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Consider the reaction CaCO3(s) + 2HCl(aq) →\rightarrow CaCl2(aq) + CO2(g) + H2O(l) .The driving force that causes the reaction to go to completion is:


A) formation of a soluble salt.
B) formation of an element.
C) formation of an insoluble gas.
D) formation of a precipitate.
E) none of these.

F) B) and C)
G) A) and E)

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When aqueous solutions of hydrochloric acid and sodium carbonate are mixed,


A) CO2 gas is produced.
B) a precipitate is formed.
C) no reaction occurs.
D) H2 gas is formed.
E) sodium metal is formed.

F) B) and C)
G) C) and D)

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When aqueous solutions of K2CO3 and CaCl2 are mixed, what is the correct formula for the precipitate that forms?


A) ClCO3(s)
B) KCl(s)
C) K2Cl2(s)
D) CaCO3(s)
E) K2Ca(s)

F) A) and E)
G) C) and D)

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When aqueous solutions of barium chloride and sodium sulfate are mixed, no reaction will occur.

A) True
B) False

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