Question 1

Write the net ionic equation for the reaction that occurs,if any,when gold is placed in a solution of hydrobromic acid.Hydrogen gas is above gold in the activity series.What are the products?

Accepted Answer

A)  H2(g)  + 2 AuBr(aq) 
B)  H2(g)  + 2 Au+(aq)  + 2 Br-(aq) 
C)  H2(g)  + 2 Au+(aq) 
D)  H2(g)  + Au2+(aq) 
E)  There is no reaction E

Question 2

Write the net ionic equation for the reaction between copper and AgC2H3O2.The apparatus for the reaction is shown below.  Regard all salts containing acetate ion as soluble in water.Copper is above silver in the activity series.What will appear on the product side of the balanced net ionic equation?

Accepted Answer

A)  Cu(s)  + 2 Ag+(aq) 
B)  Cu2+(aq)  + 2 Ag(s) 
C)  C2H3O2-(aq)  + Ag+(aq) 
D)  Cu(aq)  + 2 Ag+(s) 
E)  2 Cu(s)  + AgC2H3O2(aq)  B

Question 3

What ions are present in an aqueous solution of hydrochloric acid?

Accepted Answer

A)  H2+(aq)  + Cl2-(aq) 
B)  HCl(aq) 
C)  H+(aq)  + Cl-(aq) 
D)  H3O+(aq)  + ClO3-(aq) 
E)  H+(aq)  + ClO3-(aq)  C

Question 4

Which of the following is a weak acid?

Accepted Answer

A)  Hydrochloric acid, HCl
B)  Hydrocyanic acid, HCN
C)  Chloric acid, HClO3
D)  Nitric acid, HNO3
E)  Sulfuric acid, H2SO4

Question 5

What ions are present in what ratio in a solution of aqueous (NH4)2SO4?

Accepted Answer

A)  (NH4) 22+(aq)  + SO42-(aq) 
B)  2 NH4+(aq)  + SO42-(aq) 
C)  NH4+(aq)  + SO4-(aq) 
D)  2 N3-(aq)  + 8 H+(aq)  + 4 SO2-(aq) 
E)  2 N3-(aq)  + 8 H+(aq)  +S2-(aq)  + 4 O2-(aq)

Question 6

Which of the following is the best description of what happens when a weak acid is placed in water?

Accepted Answer

A)  The acid is only slightly dissociated
B)  About half of the water molecules dissociate into ions
C)  The acid almost completely ionizes
D)  A chemical reaction results in the production of hydrogen gas
E)  A large amount of electrical current is generated, although it is weak

Question 7

What are the reactants in the net ionic equation for the reaction that has magnesium phosphate as the only solid product?

Accepted Answer

A)  3 Mg2+(aq)  + 2 P3-(aq) 
B)  Mg2+(aq)  + PO32-(aq) 
C)  Mg2+(aq)  + PO42-(aq) 
D)  3 Mg2+(aq)  + 2 PO33-(aq) 
E)  3 Mg2+(aq)  + 2 PO43-(aq)

Question 8

Which of the following is a product of a reaction that will always be included in the net ionic equation for the reaction?

Accepted Answer

A)  NH3
B)  CO2
C)  SO3
D)  H2O
E)  all of the above

Question 9

Which of the following combinations of reactant does not produce a net change as shown by a net ionic equation?

Accepted Answer

A)  K2CO3(aq)  + CaCl2(aq) 
B)  HCl(aq)  + NaOH(aq) 
C)  NaNO3(aq)  + NH4Cl(aq) 
D)  Na2CO3(aq)  + H2SO4(aq) 
E)  Li2SO3(aq)  + HCl(aq)

Question 10

What is the preferred way to write H2CO3 when it appears as a product in a net ionic equation?

Accepted Answer

A)  H2(g)  + C(s)  + 1.5 O2(g) 
B)  H2(g)  + CO3(aq) 
C)  H2O2(aq)  + CO(g) 
D)  HCO3-(aq)  + H+(aq) 
E)  H2O(l)  + CO2(g)

Question 11

Propane,C3H8,is burned as a fuel in heating homes.Write the balanced chemical equation for this reaction.What is the coefficient for CO2?

Accepted Answer

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

Question 12

Which of the following gives the correct formulas and ratio of ions present when sodium carbonate is dissolved in water?

Accepted Answer

A)  S2-(aq)  + CO2+(aq) 
B)  2 Na+(aq)  + CO32-(aq) 
C)  2 Na+(aq)  + C4+(aq)  + 3 O2-(aq) 
D)  Na2+(aq)  + CO42-(aq) 
E)  2 Na+(aq)  + CO42-(aq)

Question 13

Which of the following is the best explanation of why a strong acid is an excellent conductor?

Accepted Answer

A)  It is almost completely ionized in water
B)  It undergoes a vigorous chemical reaction with the water molecules
C)  It is immiscible in water
D)  All acids are natural conductors
E)  It reduces electronic vibration and thus allows greater conductivity

Question 14

Write the net ionic equation for the reaction that occurs,if any,when a calcium chip is dropped into a hydrochloric acid solution.Calcium is above hydrogen in the activity series.What are the reactants (with appropriate coefficients)?

Accepted Answer

A)  Ca(s)  + 2 HCl(aq) 
B)  Ca(s)  + 2 H+(aq) 
C)  Ca2+(aq)  + 2 H+(aq) 
D)  Ca(s)  + H2+(aq) 
E)  There is no net reaction

Question 15

In which pair are both strong acids?

Accepted Answer

A)  HF and HCl
B)  HC2H3O2 and HN3
C)  HNO2 and H2SO3
D)  H2CO3 and H3PO4
E)  HClO4 and HI

Question 16

In the balanced net ionic equation for the reaction of solid CaCO3 and aqueous hydrochloric acid,which produces aqueous chloride and an acid that decomposes into the other two products,what appears on the left side of the net ionic equation?

Accepted Answer

A)  CaCO3(s)  + 2 H+(aq)  + 2 Cl-(aq) 
B)  CaCO3(s)  + 2 Cl-(aq) 
C)  CaCO3(aq)  + HCl(aq) 
D)  CaCO3(s)  + 2 H+(aq) 
E)  Ca2+(aq)  + 2 Cl-(aq)

Question 17

Which of the following is the best explanation of why a weak acid is a poor conductor?

Accepted Answer

A)  The weak acid molecules undergo a precipitation reaction in aqueous solution
B)  The weak acid molecules move too slowly to conduct well
C)  It is only slightly ionized in water
D)  It can form only dilute solutions in water
E)  It will not dissolve in water

Question 18

Write the equation for the complete oxidation of HC2H3O2.What is the sum of the coefficients?

Accepted Answer

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

Question 19

What ions are present in what ratio in a solution of aqueous calcium chloride?

Accepted Answer

A)  Ca2+(aq)  + Cl22-(aq) 
B)  Ca2+(aq)  + Cl2-(aq) 
C)  Ca2+(aq)  + 2 Cl-(aq) 
D)  CaCl+(aq)  + Cl-(aq) 
E)  Ca2+(aq)  + Cl2-(aq)

Question 20

Which of the following correctly describes an electric current?
i.Spontaneous flow of protons in gold,silver,copper,or aluminum wires
ii.Exchange of protons between cations in a solution
iii.The movement of ions in a solution
iv.The movement of negatively charged electrons in a metal

Accepted Answer

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

Exam 9: Chemical Change

Write the net ionic equation for the reaction that occurs,if any,when gold is placed in a solution of hydrobromic acid.Hydrogen gas is above gold in the activity series.What are the products?

What ions are present in an aqueous solution of hydrochloric acid?

Which of the following is a weak acid?

What ions are present in what ratio in a solution of aqueous (NH₄) ₂SO₄?

Which of the following is the best description of what happens when a weak acid is placed in water?

What are the reactants in the net ionic equation for the reaction that has magnesium phosphate as the only solid product?

Which of the following is a product of a reaction that will always be included in the net ionic equation for the reaction?

Which of the following combinations of reactant does not produce a net change as shown by a net ionic equation?

What is the preferred way to write H₂CO₃ when it appears as a product in a net ionic equation?

Propane,C₃H₈,is burned as a fuel in heating homes.Write the balanced chemical equation for this reaction.What is the coefficient for CO₂?

Which of the following gives the correct formulas and ratio of ions present when sodium carbonate is dissolved in water?

Which of the following is the best explanation of why a strong acid is an excellent conductor?

Write the net ionic equation for the reaction that occurs,if any,when a calcium chip is dropped into a hydrochloric acid solution.Calcium is above hydrogen in the activity series.What are the reactants (with appropriate coefficients) ?

In which pair are both strong acids?

In the balanced net ionic equation for the reaction of solid CaCO₃ and aqueous hydrochloric acid,which produces aqueous chloride and an acid that decomposes into the other two products,what appears on the left side of the net ionic equation?

Which of the following is the best explanation of why a weak acid is a poor conductor?

Write the equation for the complete oxidation of HC₂H₃O₂.What is the sum of the coefficients?

What ions are present in what ratio in a solution of aqueous calcium chloride?

Which of the following correctly describes an electric current? i.Spontaneous flow of protons in gold,silver,copper,or aluminum wires ii.Exchange of protons between cations in a solution iii.The movement of ions in a solution iv.The movement of negatively charged electrons in a metal

Exam 9: Chemical Change

Write the net ionic equation for the reaction that occurs,if any,when gold is placed in a solution of hydrobromic acid.Hydrogen gas is above gold in the activity series.What are the products?

Write the net ionic equation for the reaction between copper and AgC2H3O2.The apparatus for the reaction is shown below. Regard all salts containing acetate ion as soluble in water.Copper is above silver in the activity series.What will appear on the product side of the balanced net ionic equation?

What ions are present in an aqueous solution of hydrochloric acid?

Which of the following is a weak acid?

What ions are present in what ratio in a solution of aqueous (NH4) 2SO4?

Which of the following is the best description of what happens when a weak acid is placed in water?

What are the reactants in the net ionic equation for the reaction that has magnesium phosphate as the only solid product?

Which of the following is a product of a reaction that will always be included in the net ionic equation for the reaction?

Which of the following combinations of reactant does not produce a net change as shown by a net ionic equation?

What is the preferred way to write H2CO3 when it appears as a product in a net ionic equation?

Propane,C3H8,is burned as a fuel in heating homes.Write the balanced chemical equation for this reaction.What is the coefficient for CO2?

Which of the following gives the correct formulas and ratio of ions present when sodium carbonate is dissolved in water?

Which of the following is the best explanation of why a strong acid is an excellent conductor?

Write the net ionic equation for the reaction that occurs,if any,when a calcium chip is dropped into a hydrochloric acid solution.Calcium is above hydrogen in the activity series.What are the reactants (with appropriate coefficients) ?

In which pair are both strong acids?

In the balanced net ionic equation for the reaction of solid CaCO3 and aqueous hydrochloric acid,which produces aqueous chloride and an acid that decomposes into the other two products,what appears on the left side of the net ionic equation?

Which of the following is the best explanation of why a weak acid is a poor conductor?

Write the equation for the complete oxidation of HC2H3O2.What is the sum of the coefficients?

What ions are present in what ratio in a solution of aqueous calcium chloride?

Which of the following correctly describes an electric current? i.Spontaneous flow of protons in gold,silver,copper,or aluminum wires ii.Exchange of protons between cations in a solution iii.The movement of ions in a solution iv.The movement of negatively charged electrons in a metal

What ions are present in what ratio in a solution of aqueous (NH₄) ₂SO₄?

What is the preferred way to write H₂CO₃ when it appears as a product in a net ionic equation?

Propane,C₃H₈,is burned as a fuel in heating homes.Write the balanced chemical equation for this reaction.What is the coefficient for CO₂?

In the balanced net ionic equation for the reaction of solid CaCO₃ and aqueous hydrochloric acid,which produces aqueous chloride and an acid that decomposes into the other two products,what appears on the left side of the net ionic equation?

Write the equation for the complete oxidation of HC₂H₃O₂.What is the sum of the coefficients?