Deck 5: Chemical Reactions and Equations

Question 1

Identify which image in the figure represents the reactants and which image therefore represents the products in the reaction between ozone gas (O₃) and carbon monoxide gas to form oxygen gas and carbon dioxide gas.

A)upper left image = reactants, upper right image = products
B)upper right image = reactants, upper left image = products
C)lower left image = reactants, lower right image = products
D)upper left image = reactants, lower right image = products
E)upper left image = reactants, lower left image = products

Answer 1

lower left image = reactants, lower right image = products

Question 2

When solid ammonium carbonate is heated, it decomposes to form ammonia gas, carbon dioxide gas, and water vapor, so that the solid completely disappears.Write a complete, balanced equation for this reaction.

A)(NH₄)₂CO₃(s) $\rightarrow$ 2NH₃(g) + CO₂(g) + H₂O(g)
B)(NH₄)₂CO₃(s) $\rightarrow$ NH₃(g) + CO₂(g) + 3H₂O(g)
C)NH₄CO₃(s) $\rightarrow$ NH₂(g) + CO₂(g) + H₂O(g)
D)NH₄CO₃(s) $\rightarrow$ NH₃(g) + CO₂(g) + H₂O(g)
E)(NH₄)₂CO₃(s) $\rightarrow$ NH₃(g) + CO₂(g) + H₂O(g)

Answer 2

(NH₄)₂CO₃(s) $\rightarrow$ 2NH₃(g) + CO₂(g) + H₂O(g)

Question 3

The figure shows a reaction between methane gas (natural gas, CH₄) and oxygen to produce carbon dioxide and water.Is the diagram accurate, and if not, what is wrong with it, and how could it be fixed?

A)There are too many hydrogen atoms on the right-hand side of the reaction arrow.Remove one hydrogen atom from each water molecule.
B)There are too many oxygen atoms on the right-hand side of the reaction arrow.Remove one oxygen atom from the carbon dioxide.
C)The diagram is accurate as shown.
D)There are not enough carbon atoms on the left-hand side of the reaction arrow.Add another methane molecule on the left, and then another carbon dioxide molecule on the right of the arrow.
E)There are not enough oxygen molecules on the left-hand side of the reaction arrow.Add another oxygen molecule on the left of the arrow, and another water molecule on the right.

Answer 3

The diagram is accurate as shown.

Question 4

Which of the following changes represents a physical change, rather than evidence of a chemical reaction?

A)When a piece of zinc metal is placed in a solution of HCl, bubbles begin to form, and the zinc begins to dissolve.
B)When solid ammonium carbonate, (NH₄)₂CO₃, is heated, the solid disappears, and gaseous ammonia (NH₃), carbon dioxide (CO₂), and water (H₂O) are formed.
C)When dry ice (solid CO₂) is allowed to stand at room temperature, a white cloud and gaseous CO₂ are formed.
D)When a solution of KI is mixed with a solution of Pb(NO₃)₂, a yellow solid is formed.
E)When a piece of copper wire is placed in a solution of AgNO₃, a silvery solid begins to form on the surface of the wire, and the solution turns blue.

Question 5

In the figure shown, is a chemical reaction occurring?

A)No, because there are the same number of atoms in both images.
B)Yes, because the atoms have rearranged, and therefore the formulas of the products and reactants are different.
C)No, because both the reactants and products are colorless gases.
D)No, because there are oxygen atoms and carbon atoms in both images.
E)Yes, because the reactants are gases, but the product is a solid.

Question 6

Zinc metal will react with aqueous hydrochloric acid to produce aqueous zinc chloride and hydrogen gas.Write a complete, balanced equation for this reaction.

A)Zn(s) + 2HCl(aq) $\rightarrow$ ZnCl(aq) + H₂(g)
B)Zn(s) + 2HCl(aq) $\rightarrow$ ZnCl₂(aq) + H₂(g)
C)Zn(s) + HCl(aq) $\rightarrow$ ZnCl(aq) + H(g)
D)2Zn(s) + 2HCl(aq) $\rightarrow$ 2ZnCl(aq) + H₂(g)
E)Zn(s) + HCl(aq) $\rightarrow$ ZnCl(aq) + H₂(g)

Question 7

Gaseous nitrogen monoxide reacts with oxygen gas to form brown nitrogen dioxide gas.What would the products of the reaction be, if the reactants are those shown in the figure?

A)6 molecules of nitrogen dioxide
B)5 molecules of nitrogen dioxide, and 1 molecule of oxygen
C)6 molecules of nitrogen dioxide, and 1 molecule of oxygen
D)4 molecules of nitrogen dioxide, and 2 molecules of nitrogen monoxide
E)3 molecules of nitrogen dioxide, and 3 molecules of nitrogen monoxide

Question 8

Identify which image in the figure represents the reactants and which image therefore represents the products in the reaction between xenon gas and fluorine gas to form xenon tetrafluoride gas.

A)upper right image = reactants, upper left image = products
B)lower left image = reactants, upper left image = products
C)upper left image = reactants, upper right image = products
D)upper left image = reactants, lower left image = products
E)upper left image = reactants, lower right image = products

Question 9

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

Question 10

The figure shows a reaction between hydrogen and oxygen gases to produce water.Is the diagram accurate, and if not, what is wrong with it, and how could it be fixed?

A)There are too many water molecules on the right.Remove one water molecule from the image on the right.
B)There are not enough oxygen atoms on the right.Add one more water molecule to the right image.
C)There are too many oxygen atoms in the image on the left.Remove one oxygen molecule.
D)There are not enough hydrogen atoms on the right.Add one more water molecule to the left image, and one more hydrogen molecule to the right image.
E)The diagram is accurate as shown.

Question 11

Sulfur dioxide gas reacts with oxygen gas to form sulfur trioxide gas.What would the products of the reaction be, if the reactants are those shown in the figure?

A)2 molecules of sulfur trioxide, and 2 molecules of sulfur dioxide
B)4 molecules of sulfur trioxide, and 1 molecule of oxygen
C)3 molecules of sulfur trioxide, and 1 molecule of oxygen
D)3 molecules of sulfur trioxide, and 1 molecule of sulfur dioxide
E)4 molecules of sulfur trioxide

Question 12

In the figure shown, is a chemical reaction occurring?

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.

Question 13

Write a complete, balanced equation for the reaction that occurs when sodium metal reacts with water to form hydrogen gas and aqueous sodium hydroxide.

A)Na(s) + 2H₂O(l) $\rightarrow$ 2NaOH(aq) + 2H₂(g)
B)Na(s) + 2H₂O(l) $\rightarrow$ NaOH(aq) + 2H₂(g)
C)Na(s) + H₂O(l) $\rightarrow$ NaOH(aq) + H₂(g)
D)Na(s) + H₂O(l) $\rightarrow$ NaOH(aq) + H(g)
E)2Na(s) + 2H₂O(l) $\rightarrow$ 2NaOH(aq) + H₂(g)

Question 14

The figure shows the chemical reaction between nitrogen gas and hydrogen gas to produce ammonia (NH₃) gas.Which of the following changes would make the diagram correctly represent conservation of mass?

A)Add one H₂ molecule from the image on the left.
B)Add three NH₃ molecules to the image on the right.
C)Add three H₂ molecules t the image on the right.
D)Remove one H₂ molecules from the image on the left.
E)Remove one NH₃ molecule from the image on the left.

Question 15

Fireworks which give off bright flashes of white light often contain magnesium metal.When the magnesium burns in the presence of oxygen, it forms solid magnesium oxide, and emits a bright white light.Write a complete, balanced equation for this reaction.

A)Mg(s) + O(g) $\rightarrow$ MgO(s)
B)4Mg(s) + O₂(g) $\rightarrow$ 2Mg₂O(s)
C)2Mg(s) + O₂(g) $\rightarrow$ 2MgO(s)
D)Mg(s) + O₂(g) $\rightarrow$ MgO₂(s)
E)Mg(s) + O₂(g) $\rightarrow$ MgO(s)

Question 16

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

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

Question 17

The figure shows a reaction between xenon gas and fluorine gas.Is the diagram correct, and if not, how could it be modified to show that the law of conservation of mass is obeyed?

A)Add two more XeF₄ molecules and two more Xe atoms to the right image.
B)Add four more XeF₄ molecules to the right image.
C)Add three more XeF₄ molecules and one more Xe atom to the right image.
D)Add one more XeF₄ molecule and three more Xe atoms to the right image.
E)The diagram is accurate as shown.

Question 18

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

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

Question 19

Which of the following changes represents a physical change, rather than evidence of a chemical reaction?

A)When water and a yellow solution of antifreeze are mixed, the resulting solution is a lighter shade of yellow than the original antifreeze solution.
B)When concentrated HNO₃ is placed in contact with copper metal, a brown gas is formed, the copper dissolves, and a green solution is formed.
C)When an egg is fried, the clear part becomes white, and the egg becomes a solid.
D)When a piece of zinc metal is placed in a blue solution of copper sulfate, the solution turns from blue to colorless, the zinc dissolves, and copper metal is formed.
E)When solutions of AgNO₃ and NaCl are mixed, a white solid forms.

Question 20

In the figure shown, is a chemical reaction occurring?

A)No, because there are the same number of atoms in both images.
B)Yes, because the atoms have rearranged, and therefore the formulas of the products and reactants are different.
C)No, because there are oxygen atoms and nitrogen atoms in both images.
D)No, because both the reactants and products are colorless gases.
E)Yes, because the reactants are gases, but the product is a solid.

Question 21

When the equation shown is balanced properly, what is the coefficient in front of O₂(g)?
C₆H₁₄(l) + O₂(g) $\rightarrow$ CO₂(g) + H₂O(g)

A)6
B)19
C)9
D)12
E)7

Question 22

Balance the following skeletal equation: Ba(NO₃)₂(aq) + K₂SO₄(aq) $\rightarrow$ BaSO₄(s) + KNO₃(aq)

A)2Ba(NO₃)₂(aq) + 2K₂SO₄(aq) $\rightarrow$ 2BaSO₄(s) + 2KNO₃(aq)
B)2Ba(NO₃)₂(aq) + K₂SO₄(aq) $\rightarrow$ 2BaSO₄(s) + KNO₃(aq)
C)Ba(NO₃)₂(aq) + K₂SO₄(aq) $\rightarrow$ BaSO₄(s) + 2KNO₃(aq)
D)2Ba(NO₃)₂(aq) + 2K₂SO₄(aq) $\rightarrow$ 2BaSO₄(s) + 3KNO₃(aq)
E)Ba(NO₃)₂(aq) + K₂SO₄(aq) $\rightarrow$ BaSO₄(s) + KNO₃(aq)

Question 23

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

Question 24

A reaction which has two elements as reactants and one compound as a product is:

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

Question 25

The gases carbon dioxide and hydrogen can react together to form carbon monoxide gas and water vapor.Which of the diagrams in the figure could be used to represent this reaction?

A)D
B)A
C)B
D)none of these
E)C

Question 26

Write a balanced equation to represent the reaction shown in the figure.

A)2N₂ + 6Cl₂ $\rightarrow$ 3NCl₄
B)N₂ + Cl₂ $\rightarrow$ 2NCl₃
C)2N₂ + 6Cl₂ $\rightarrow$ 4NCl₃
D)N₂ + 6Cl₂ $\rightarrow$ 4NCl₃
E)2N₂ + 5Cl₂ $\rightarrow$ 3NCl₃

Question 27

After the following equation is properly balanced, what is the coefficient in front of O₂(g)?
PbS(s) + O₂(g) $\rightarrow$ PbO(s) + SO₂(g)

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

Question 28

Balance the following skeletal equation: CH₄(g) $\rightarrow$ C₂H₂(g) + H₂(g).

A)4CH₄(g) $\rightarrow$ 2C₂H₂(g) + 5H₂(g)
B)2CH₄(g) $\rightarrow$ C₂H₂(g) + 3H₂(g)
C)CH₄(g) $\rightarrow$ C₂H₂(g) + H₂(g)
D)2CH₄(g) $\rightarrow$ C₂H₂(g) + H₂(g)
E)2CH₄(g) $\rightarrow$ C₂H₂(g) + 2H₂(g)

Question 29

Write a balanced equation to represent the reaction shown in the figure.

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

Question 30

Balance the following skeletal equation: C₃H₈(g) + O₂(g) $\rightarrow$ CO₂(g) + H₂O(g).

A)C₃H₈(g) + O₂(g) $\rightarrow$ 3CO₂(g) + 4H₂O(g)
B)C₃H₈(g) + O₂(g) $\rightarrow$ 3CO₂(g) + 2H₂O(g)
C)C₃H₈(g) + 3O₂(g) $\rightarrow$ 3CO₂(g) + 4H₂O(g)
D)C₃H₈(g) + 5O₂(g) $\rightarrow$ 3CO₂(g) + 4H₂O(g)
E)C₃H₈(g) + 4O₂(g) $\rightarrow$ 3CO₂(g) + 4H₂O(g)

Question 31

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.

Question 32

A reaction which has one element and one compound as reactants and one element and one compound as products is:

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

Question 33

Balance the following skeletal equation: NH₃(g) + O₂(g) $\rightarrow$ NO₂(g) + H₂O(g).

A)NH₃(g) + O₂(g) $\rightarrow$ NO₂(g) + 2H₂O(g)
B)NH₃(g) + O₂(g) $\rightarrow$ NO₂(g) + H₂O(g)
C)2NH₃(g) + 2O₂(g) $\rightarrow$ 2NO₂(g) + 3H₂O(g)
D)4NH₃(g) + 7O₂(g) $\rightarrow$ 4NO₂(g) + 6H₂O(g)
E)2NH₃(g) + O₂(g) $\rightarrow$ NO₂(g) + 2H₂O(g)

Question 34

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.

Question 35

A reaction which has one compound as a reactant and two elements as products is:

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

Question 36

Balance the following skeletal equation: Li(s) + H₂O(l) $\rightarrow$ LiOH(aq) + H₂(g).

A)Li(s) + H₂O(l) $\rightarrow$ LiOH(aq) + H₂(g)
B)2Li(s) + 2H₂O(l) $\rightarrow$ 2LiOH(aq) + H₂(g)
C)Li(s) + 2H₂O(l) $\rightarrow$ LiOH(aq) + H₂(g)
D)Li(s) + 2H₂O(l) $\rightarrow$ 2LiOH(aq) + 2H₂(g)
E)Li(s) + 2H₂O(l) $\rightarrow$ 2LiOH(aq) + H₂(g)

Question 37

Balance the following skeletal equation: C₂H₅OH(l) + O₂(g) $\rightarrow$ CO₂(g) + H₂O(g).

A)C₂H₅OH(l) + O₂(g) $\rightarrow$ CO₂(g) + 3H₂O(g)
B)C₂H₅OH(l) + 2O₂(g) $\rightarrow$ 2CO₂(g) + 3H₂O(g)
C)C₂H₅OH(l) + O₂(g) $\rightarrow$ 2CO₂(g) + 3H₂O(g)
D)C₂H₅OH(l) + 3O₂(g) $\rightarrow$ 2CO₂(g) + 3H₂O(g)
E)2C₂H₅OH(l) + 3O₂(g) $\rightarrow$ 4CO₂(g) + 3H₂O(g)

Question 38

Balance the following skeletal equation: Pb(NO₃)₂(aq) + KI(aq) $\rightarrow$ PbI₂(s) + KNO₃(aq)

A)Pb(NO₃)₂(aq) + KI(aq) $\rightarrow$ PbI₂(s) + KNO₃(aq)
B)Pb(NO₃)₂(aq) + 2KI(aq) $\rightarrow$ PbI₂(s) + 2KNO₃(aq)
C)Pb(NO₃)₂(aq) + 2KI(aq) $\rightarrow$ PbI₂(s) + KNO₃(aq)
D)2Pb(NO₃)₂(aq) + 2KI(aq) $\rightarrow$ PbI₂(s) + 4KNO₃(aq)
E)2Pb(NO₃)₂(aq) + 2KI(aq) $\rightarrow$ 2PbI₂(s) + 4KNO₃(aq)

Question 39

Balance the following skeletal equation: HCl(g) + O₂(g) $\rightarrow$ H₂O(l) + Cl₂(g)

A)2HCl(g) + O₂(g) $\rightarrow$ 2H₂O(l) + Cl₂(g)
B)HCl(g) + O₂(g) $\rightarrow$ H₂O(l) + Cl₂(g)
C)2HCl(g) + O₂(g) $\rightarrow$ H₂O(l) + Cl₂(g)
D)4HCl(g) + O₂(g) $\rightarrow$ 2H₂O(l) + 2Cl₂(g)

Question 40

A reaction which has two compounds as reactants and two compounds as products is:

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

Question 41

The class of the reaction shown in the figure is:

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

Question 42

The class of the reaction shown in the figure is:

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

Question 43

Sodium metal reacts with water in a single-displacement reaction.Which of the following best describes the identity of the products of this reaction?

A)NaH(aq) and O₂(g)
B)NaOH(aq) and H₂(g)
C)NaOH₂(aq)
D)NaH₂(aq) and O(g)
E)NaOH(aq) and H(g)

Question 44

When aqueous solutions of H₂SO4 and NaOH are mixed, _______ will occur.

A)no reaction
B)a double-displacement reaction
C)a single-displacement reaction
D)a decomposition reaction
E)a combination reaction

Question 45

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)

Question 46

Crystals of red mercury(II) oxide, when heated, form liquid mercury and oxygen gas.The class of this reaction is:

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

Question 47

The class of the reaction shown in the figure is:

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

Question 48

Which of the following equations best describes the reaction that occurs when potassium metal reacts with oxygen gas in a combination reaction?

A)K(s) + O₂(g) $\rightarrow$ KO₂(s)
B)4K(s) + O₂(g) $\rightarrow$ 2K₂O(s)
C)K(s) + O₂(g) $\rightarrow$ KO(s) + O(g)
D)2K(s) + O(g) $\rightarrow$ K₂O(s)
E)K(s) + O(g) $\rightarrow$ KO(s)

Question 49

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)

Question 50

A piece of magnesium metal is placed in a solution of hydrochloric acid, resulting in the formation of hydrogen gas and a solution of magnesium chloride.The class of this reaction is:

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

Question 51

The class of the reaction shown in the figure is:

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

Question 52

What is the product of the combination reaction that occurs when magnesium metal reactions with oxygen gas?

A)MgO₂(s)
B)Mg₂O₃(s)
C)Mg₂O(s)
D)MgO(s)
E)Mg₂O₂(s)

Question 53

What are the products of the combustion reaction of methane, CH₄, with oxygen?

A)CO₂(g) and H₂O(g)
B)H₂CO₃(aq)
C)CO₂(g) only
D)C(s), and H₂O(g)
E)CO(g) and H₂(g)

Question 54

Write and balance the equation for the decomposition reaction that occurs when Mercury(II) oxide decomposes to its elements.

A)HgO(s) $\rightarrow$ Hg(l) + O₂(g)
B)2HgO(s) $\rightarrow$ 2Hg(l) + O₂(g)
C)Hg₂O(s) $\rightarrow$ 2Hg(l) + O₂(g)
D)HgO₂(s) $\rightarrow$ Hg(l) + 2O(g)
E)2Hg(l) +O₂(g) $\rightarrow$ HgO₂(s)

Question 55

The class of the reaction shown in the figure is:

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

Question 56

A piece of magnesium metal is burned in air (containing oxygen gas), and a white powder of magnesium oxide is formed.The class of this reaction is:

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

Question 57

What is the correct formula for the product of the combination reaction between calcium metal and oxygen gas?

A)Ca₂O(s)
B)Ca₂O₃(s)
C)Ca₂O₂(s)
D)CaO(s)
E)CaO₂(s)

Question 58

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)

Question 59

Write and balance the equation for the decomposition reaction that occurs when solid magnesium sulfate trihydrate, MgSO₄·3H₂O, is heated.

A)MgSO₄·3H₂O(s) $\rightarrow$ MgSO₄(s) + 3H₂O(g)
B)MgSO₄·3H₂O(s) $\rightarrow$ MgS(s) + 6H₂O(g)
C)MgSO₄·3H₂O(s) $\rightarrow$ MgSO₄·3H₂O(s)
D)MgSO₄·3H₂O(s) $\rightarrow$ Mg(s) + SO₄·3H₂O(s)
E)MgSO₄·3H₂O(s) $\rightarrow$ MgSO₄(s) + H₂O(g)

Question 60

Classify the following reaction: 2C₈H₁₈(l) + 25O₂(g) $\rightarrow$ 16CO₂(g) + 18H₂O(g)

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

Question 61

When calcium metal is placed in water, a single-displacement reaction occurs.Write a balanced equation to describe this reaction.

A)Ca(s) + H₂O(l) $\rightarrow$ Ca(OH)₂(aq) + H₂(g)
B)Ca(s) + H₂O(l) $\rightarrow$ CaO(s) + H₂(g)
C)Ca(s) + H₂O(l) $\rightarrow$ CaO(aq) + H₂(g)
D)2Ca(s) + 2H₂O(l) $\rightarrow$ 2Ca(OH)₂(aq) + H₂(g)
E)Ca(s) + 2H₂O(l) $\rightarrow$ Ca(OH)₂(aq) + H₂(g)

Question 62

When copper metal is placed in a solution of platinum(II) chloride, will a reaction occur? If so, what is the balanced equation for the reaction?

A)Cu(s) + Pt₂Cl(aq) $\rightarrow$ CuCl(aq) + 2Pt(aq)
B)Yes.Cu(s) + PtCl₂(aq) $\rightarrow$ CuCl(aq) + PtCl(aq)
C)No reaction will occur.
D)Yes.Cu(s) + Pt₂Cl(aq) $\rightarrow$ CuCl(aq) + Pt(aq)
E)Yes.Cu(s) + PtCl₂(aq) $\rightarrow$ CuCl₂(aq) + Pt(s)

Question 63

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)

Question 64

When aqueous solutions of sodium chloride and silver nitrate are mixed, a double-displacement reaction occurs.What is the balanced equation for the reaction?

A)NaCl(aq) + AgNO₃(aq) $\rightarrow$ NaNO₃(aq) + ClAg(s)
B)NaCl(aq) + AgNO₃(aq) $\rightarrow$ NaNO₃(aq) + AgCl(aq)
C)NaCl(aq) + AgNO₃(aq) $\rightarrow$ NaNO₃(aq) + AgCl(s)
D)NaCl(aq) + AgNO₃(aq) $\rightarrow$ NaNO₃(aq) + 3AgCl(s)
E)NaCl(aq) + AgNO₃(aq) $\rightarrow$ Na(s) + AgNO₃Cl(aq)

Question 65

When iron metal is placed into a solution of hydrochloric acid, will a reaction occur? If so, what is the balanced equation for the reaction?

A)Yes.Fe(s) + 2HCl(aq) $\rightarrow$ FeCl₂(aq) + H₂(g)
B)Yes.Fe(s) + 3HCl(aq) $\rightarrow$ FeCl₃(aq) + H₂(g)
C)No reaction will occur.
D)Yes.2Fe(s) + 2HCl(aq) $\rightarrow$ 2FeCl(aq) + H₂(g)

Question 66

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

Question 67

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)

Question 68

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

A)NaOH
B)KI
C)CaS
D)Ca(NO₃)₂
E)Na₂SO₄

Question 69

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

A)Li₂SO₄
B)AgI
C)Ca(CH₃CO₂)₂
D)NaCl
E)KOH

Question 70

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.

Question 71

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

A)Yes.K₂CO₃(aq) + Ca(NO₃)₂(aq) $\rightarrow$ KNO₃(aq) + CaK(s)
B)No reaction will occur.
C)Yes.K₂CO₃(aq) + Ca(NO₃)₂(aq) $\rightarrow$ KNO₃(aq) + CaCO₃(s)
D)Yes.K₂CO₃(aq) + Ca(NO₃)₂(aq) $\rightarrow$ K₂(NO₃)₂(aq) + CaCO₃(s)
E)Yes.K₂CO₃(aq) + Ca(NO₃)₂(aq) $\rightarrow$ 2KNO₃(aq) + CaCO₃(s)

Question 72

When copper metal is placed into a silver nitrate solution, a single-displacement reaction occurs, forming a copper(II) compound.Write a balanced equation to describe this reaction.

A)Cu(s) + 2AgNO₃(aq) $\rightarrow$ Cu(NO₃)₂(aq) + 2Ag(s)
B)Cu(s) + Ag(NO₃)₂(aq) $\rightarrow$ CuNO₃(aq) + AgNO₃(aq)
C)Cu(s) + Ag(NO₃)₂(aq) $\rightarrow$ Cu(NO₃)₂(aq) + Ag(s)
D)2Cu(s) + Ag(NO₃)₂(aq) $\rightarrow$ 2Cu(NO₃)₂(aq) + Ag(s)
E)Cu(s) + AgNO₃(aq) $\rightarrow$ CuNO₃(aq) + Ag(aq)

Question 73

When copper metal is placed in a solution of zinc nitrate, will a reaction occur? If so, what is the balanced equation for the reaction?

A)Yes.Cu(s) + Zn(NO₃)₂(aq) $\rightarrow$ Cu(NO₃)₂(aq) + Zn(s)
B)Yes.Cu(s) + Zn(NO₃)₂(aq) $\rightarrow$ CuNO₃(aq) + ZnNO₃(aq)
C)No reaction will occur.
D)Yes.Cu(s) + Zn₂NO₃(aq) $\rightarrow$ CuNO₃(aq) + Zn(aq)
E)Yes.Cu(s) + Zn₂NO₃(aq) $\rightarrow$ CuNO₃(aq) + 2Zn(aq)

Question 74

When potassium metal is placed in water, will a reaction occur? If so, what is the balanced equation for the reaction?

A)Yes.2K(s) + 2H₂O(l) $\rightarrow$ 2KOH(aq) + H₂(g)
B)Yes.2K(s) + 2H₂O(l) $\rightarrow$ 2KH₂O(aq)
C)Yes.2K(s) + 2H₂O(l) $\rightarrow$ 2KOH(aq) + 2H₂(g)
D)No reaction will occur.
E)Yes.2K(s) + 2H₂O(l) $\rightarrow$ 2K(OH)₂(aq) + H₂(g)

Question 75

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

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

Question 76

Write and balance the equation for the combination reaction that occurs when sulfur dioxide gas, SO₂, reacts with oxygen gas.

A)3SO₂(g) + 2O₂(g) $\rightarrow$ 3SO₃(g)
B)SO₂(g) + O₂(g) $\rightarrow$ SO₃(g)
C)SO₂(g) + O₂(g) $\rightarrow$ SO₄(g)
D)2SO₂(g) + 2O₂(g) $\rightarrow$ 2SO₃(g)
E)2SO₂(g) + O₂(g) $\rightarrow$ 2SO₃(g)

Question 77

When aqueous solutions of potassium chloride and lead(II) nitrate are mixed, a double-displacement reaction occurs.What is the balanced equation for the reaction?

A)KCl(aq) + Pb₂NO₃(aq) $\rightarrow$ KNO₃(aq) + PbCl(aq)
B)KCl(aq) + Pb(NO₃)₂(aq) $\rightarrow$ K(s) + PbNO₃Cl(aq)
C)KCl(aq) + Pb₂NO₃(aq) $\rightarrow$ KNO₃(aq) + 2PbCl(s)
D)2KCl(aq) + Pb(NO₃)₂(aq) $\rightarrow$ KNO₃(aq) + ClPb(s)
E)2KCl(aq) + Pb(NO₃)₂(aq) $\rightarrow$ 2KNO₃(aq) + PbCl₂(s)

Question 78

Consider the reaction Ca(OH)₂(aq) + 2HCl(aq) $\rightarrow$ CaCl₂(aq) + 2H₂O(l).The driving force that causes the reaction to go to completion is:

A)formation of water.
B)formation of a soluble salt.
C)formation of a precipitate.
D)formation of an insoluble gas.
E)formation of an element.

Question 79

When zinc metal is placed into a copper(II) nitrate solution, a single-displacement reaction occurs.Write a balanced equation to describe this reaction.

A)2Zn(s) + Cu(NO₃)₂(aq) $\rightarrow$ 2Zn(NO₃)₂(aq) + Cu(s)
B)Zn(s) + Cu(NO₃)₂(aq) $\rightarrow$ ZnNO₃(aq) + CuNO₃(aq)
C)Zn(s) + Cu₂NO₃(aq) $\rightarrow$ ZnNO₃(aq) + Cu(aq)
D)Zn(s) + Cu(NO₃)₂(aq) $\rightarrow$ Zn(NO₃)₂(aq) + Cu(s)
E)Zn(s) + Cu₂NO₃(aq) $\rightarrow$ ZnNO₃(aq) + 2Cu(aq)

Question 80

Predict which of the following reactions will occur?

A)All three will occur.
B)i only
C)iii only
D)ii only
E)ii and iii