Deck 8: Chemical Reactions

Question 1

When the equation ___ Ca(OH)₂ + ___ H₃PO₄ $\rightarrow$ ___ Ca₃(PO₄)₂ + ___ H₂O is properly balanced,what is the sum of the coefficients?

A)8 or less
B)9
C)10
D)11
E)12 or more

Answer 1

12 or more

Question 2

What is the coefficient for carbon dioxide when the equation ___ C₂H₆ + ___ O₂ $\rightarrow$ ___ CO₂ + ___ H₂O is properly balanced?

A)7
B)6
C)5
D)4
E)2

Answer 2

4

Question 3

When potassium contacts fluorine gas,potassium fluoride is produced.Write the balanced chemical equation for this reaction.What is the coefficient for potassium fluoride?

A)1
B)2
C)3
D)4
E)5

Answer 3

2

Question 4

What is the coefficient for Zn when the equation ___ Zn + ___ H₃PO₄ $\rightarrow$ ___ H₂ + ___ Zn₃(PO₄)₂ is properly balanced?

A)1
B)2
C)3
D)4
E)6

Question 5

Which of the following generally indicates the possibility of a chemical change?
(i)Color change
(ii)Formation of a solid
(iii)Formation of a gas
(iv)Absorption or release of heat energy
(v)Emission of light energy

A)All
B)All but i
C)All but ii
D)All but iii
E)All but v

Question 6

Balance the equation C₈H₁₈( )+ ___ O₂(g) $\rightarrow$ ___ CO₂(g)+ ___ H₂O( ).What is the coefficient for O₂(g)?

A)16
B)9
C)25
D)12
E)50

Question 7

Ammonia is formed from its elements.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A)3 or less
B)4
C)5
D)6
E)7 or more

Question 8

Consider the following particulate-level representation of a chemical equation: Assume that all spheres represent atoms of A.Which of the following is a correctly balanced equation for this reaction?

A)A $\rightarrow$ 2 A
B)A₂ $\rightarrow$ 2 A
C)2 A $\rightarrow$ 2 A
D)A $\rightarrow$ A + A
E)A(s) $\rightarrow$ A(g)

Question 9

Consider the hypothetical chemical reaction represented by the equation 3 A + 2 B $\rightarrow$ A₃B₂ Which of the following is a correct interpretation of this equation?
(i)3 grams of A react with 2 grams of B to form 1 gram of A₃B₂
(ii)3 atoms of A react with 2 atoms of B to form 1 molecule of A₃B₂
(iii)3 moles of A react with 2 moles of B to form 1 mole of A₃B₂

A)i only
B)ii only
C)iii only
D)ii and iii
E)i,ii,and iii

Question 10

When atomic phosphorous (P)and oxygen are directly combined,P₄O₁₀ is produced.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A)3 or less
B)5
C)7
D)9
E)10 or more

Question 11

Consider the following particulate-level representation.The larger spheres represent N and the smaller spheres represent H. Which of the following correctly characterizes this representation?

A)The reactant could be represented as NH₃.
B)The products of the reaction are N₂ and H₂.
C)The equation is "balanced".
D)If the equation for the reaction were written as shown above the coefficient of the nitrogen containing product would be 4.
E)All of these correctly characterize this reaction.

Question 12

Calcium combines with bromine to make calcium bromide.Write the balanced chemical equation for this reaction.What is the coefficient for bromine?

A)1
B)2
C)3
D)4
E)5

Question 13

The following image shows the result of mixing an aqueous solution of silver nitrate with an aqueous solution of sodium chloride. The products of the reaction are a solid and an solution.The physical states of the reaction in the equation should be specified using which set of state symbols,respectively?

A)( ),( ),(s),( )
B)(aq),(aq),(s),(aq)
C)(aq),(aq),(s),( )
D)( ),( ),(s),(aq)
E)(aq),(aq),(p),(aq)

Question 14

When the equation ___ PCl₅ + ___ H₂O $\rightarrow$ ___ H₃PO₄ + ___ HCl is properly balanced,what is the sum of the coefficients?

A)8 or less
B)9
C)10
D)11
E)12 or more

Question 15

Lithium combines with oxygen to form lithium oxide.Write the balanced chemical equation for this reaction.What is the coefficient for lithium?

A)4
B)3
C)2
D)1
E)none of the above

Question 16

Calcium reacts with the oxygen in the air,forming calcium oxide.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A)3 or less
B)4
C)5
D)6
E)7 or more

Question 17

What is the coefficient for H₂ when the equation ___ Ba + ___ H₃AsO₄ $\rightarrow$ __ H₂ + ___ Ba₃(AsO₄)₂ is properly balanced?

A)1
B)3
C)5
D)2
E)6

Question 18

Consider the hypothetical chemical reaction represented by the equation A + 2 B $\rightarrow$ 3 C + D Which of the following interpretations of this equation is not correct?

A)1 kg of A reacts with 2 kg of B to form 3 kg of C and 1 kg of D
B)1 particle of A reacts with 2 particles of B to form 3 particles of C and 1 particle of D
C)1 dozen particles of A reacts with 2 dozen particles of B to form 3 dozen particles of C and 1 dozen particles of D
D)1 mole of particles of A reacts with 2 moles of particles of B to form 3 moles of particles of C and 1 mole of particles of D
E)1 kilomole of particles of A reacts with 2 kilomoles of particles of B to form 3 kilomoles of particles of C and 1 kilomole of particles of D

Question 19

A chemical equation may sometimes be balanced with fractional coefficients.This is not appropriate when utilizing what interpretation of the reaction?

A)Macroscopic
B)Molar
C)Particulate
D)Both macroscopic and molar
E)Both molar and particulate

Question 20

A pot of room temperature water is placed on a stovetop burner.After a couple of minutes,small,odorless,colorless bubbles form and bubble out of the liquid.After a few more minutes,similar,larger bubbles form and bubble out at a faster rate.Which of the following is the best explanation of the observations?

A)No change occurs because the bubbles contain no matter.
B)The smaller bubbles are a result of a physical change,and the larger bubbles are the result of a chemical change.
C)The smaller bubbles are the result of a chemical change,and the larger bubbles are the result of a physical change.
D)Both the smaller and larger bubbles are the result of a physical change.
E)Both the smaller and larger bubbles are the result of a chemical change.

Question 21

Solid aluminum is dropped into a solution of sulfuric acid.Write the balanced chemical equation for this reaction.What is the coefficient for sulfuric acid?

A)1
B)2
C)3
D)4
E)5

Question 22

When sodium chloride and silver nitrate solutions are combined,the reaction shown below occurs. Write the balanced chemical equation for this reaction.What is the coefficient for silver nitrate?

A)5
B)4
C)3
D)2
E)1

Question 23

Calcium nitrate and potassium fluoride solutions react to form a precipitate.How should this reaction be classified?

A)combination
B)decomposition
C)double-replacement
D)single-replacement

Question 24

Calcium reacts with hydrobromic acid.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A)4 or less
B)5
C)6
D)7
E)8 or more

Question 25

Examine the following two beakers. When the equation for this reaction is balanced,what should the coefficient of Al?

A)1
B)2
C)3
D)4
E)6

Question 26

A precipitate forms when magnesium chloride and sodium fluoride solutions are combined.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A)6
B)5
C)4
D)9
E)none of the above

Question 27

Molten sodium chloride is decomposed into its elements by electrolysis.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A)3 or less
B)4
C)5
D)6
E)7 or more

Question 28

Consider the following particulate-level representation of a reaction. How would this reaction be classified.

A)combination
B)decomposition
C)single-replacement
D)double-replacement

Question 29

A piece of potassium is placed in a phosphoric acid solution.Write the balanced chemical equation for this reaction.What is the coefficient for potassium?

A)1
B)2
C)3
D)4
E)none of the above

Question 30

A precipitate forms when solutions of magnesium bromide and sodium hydroxide are combined.Write the balanced chemical equation for this reaction.What is the coefficient for magnesium bromide?

A)1
B)2
C)3
D)4
E)5

Question 31

Pure hydrogen iodide decomposes spontaneously to its elements.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A)5
B)3
C)7
D)4
E)6

Question 32

Consider the following particulate-level representation of a reaction How is the reaction classified?

A)combination
B)decomposition
C)single-replacement
D)double-replacement

Question 33

Sulfuric acid neutralizes a barium hydroxide solution.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A)4
B)5
C)6
D)7
E)8 or more

Question 34

Lead(II)carbonate decomposes to lead(II)oxide and carbon dioxide.Write the balanced chemical equation for this reaction.What is the coefficient for lead(II)carbonate?

A)1
B)2
C)3
D)4
E)5

Question 35

Barium peroxide,BaO₂,breaks down into barium oxide and oxygen.Write the balanced chemical equation for this reaction.What is the coefficient for barium oxide?

A)3
B)1
C)5
D)4
E)2

Question 36

The combination of copper(II)nitrate and ammonium sulfide solutions yields a precipitate.Write the balanced chemical equation for this reaction.What is the coefficient for copper(II)nitrate?

A)3
B)1
C)5
D)2
E)4

Question 37

Nitric acid reacts with a solution of potassium hydroxide.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A)10
B)8
C)6
D)4
E)none of the above

Question 38

Magnesium is placed into sulfuric acid.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A)4 or less
B)5
C)6
D)7
E)8 or more

Question 39

Solid magnesium hydroxide is added to hydrochloric acid.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A)4
B)5
C)6
D)7
E)8 or more

Question 40

Bromine is added to a solution of sodium iodide.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A)4 or less
B)5
C)6
D)7
E)8 or more

Question 41

Calcium hydroxide is added to perchloric acid.Write the balanced chemical equation for this reaction.What is the coefficient for perchloric acid?

A)5
B)4
C)3
D)2
E)1

Question 42

Aluminum hydroxide is added to nitric acid.Write the balanced chemical equation for this reaction.What is the coefficient for aluminum hydroxide?

A)6
B)4
C)3
D)2
E)1

Question 43

Phosphoric acid reacts with sodium hydroxide.Write the balanced chemical equation for this reaction.What is the coefficient for sodium hydroxide?

A)3
B)6
C)2
D)1
E)4