Deck 4: Chemical Reactions

Question 1

In a balanced equation,the number of atoms of each element in the products must equal to the number of atoms of each element in the reactants.

Answer 1

True

Question 2

When the equation CS₂ + Cl₂ → CCl₄ + S₂Cl₂ is balanced with the smallest integer coefficients,the sum of the coefficients is:

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

Answer 2

6

Question 3

How many moles of H₃PO₄ are produced when 20.0 g of HCl are produced by the reaction

A)(20.0/36.5)g
B)(20.0/35.5)/5 g
C)(20.0/36.5)/5 g
D)(20.0/98.0)g
E)(20.0/98.0)/5 g

Answer 3

(20.0/36.5)/5 g

Question 4

How many grams of N₂ are required to react with 2.30 moles of Mg in the following process?
3 Mg + N₂ → Mg₃N₂? (Mg = 24.3 g/mol,N = 14.0 g/mol)

A)21.5 g
B)0.767 g
C)64.4 g
D)0.027 g
E)193.2 g

Question 5

In a solution of alcohol and water that is 70% water,alcohol is the solvent.

Question 6

Molarity is defined as moles of solute per kg of solution.

Question 7

A formula is a shorthand way of representing a chemical reaction.

Question 8

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients?
Na + HCl → NaCl + H₂

A)7
B)4
C)2
D)10
E)9

Question 9

When the equation Fe₂(C₂O₄)₃ → FeC₂O₄ + CO₂ is balanced with the smallest integer coefficients,the coefficient of CO₂ is:

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

Question 10

In a chemical equation,Δ above the yield sign means the reaction will produce heat.

Question 11

(aq)indicates that the compound is dissolved in alcohol.

Question 12

A chemical equation is a shorthand way of representing a chemical reaction.

Question 13

What is the sum of the coefficients in the balanced equation that represents the complete combustion of the relatively new gasoline additive "MTBE," for which the molecular formula is C₅H₁₂O?

A)39
B)37
C)29
D)24
E)20

Question 14

The reactant that is in excess determines the amount of products formed.

Question 15

The numbers in front of formulas in balanced equations are called stoichiometric coefficients.

Question 16

Stoichiometric factor relates the amounts,in moles,of any two substances involved in chemical reaction.

Question 17

Which metal will produce the most hydrogen per gram of metal?

A)2 Li + 2 HCl → 2 LiCl + H₂
B)Sn + 4 HCl → SnCl₄ + 2 H₂
C)2 Fe + 6 HCl →2 FeCl₃ + 3 H₂
D)Mg + 2 HCl → MgCl₂ + H₂
E)2 Cr + 6 HCl → 2 CrCl₃ + 3H₂

Question 18

For the reaction
And 7.2 g of Fe₂O₃ (159.8 g/mol)produce how many g of Fe (55.9 g/mol)?

A)2.5 (55.9/27.0)g
B)2.5 (55.9)(2)/(27.0)(2)g
C)7.2 (55.9)(2)/159.8 g
D)7.2 (55.9/159.8)g
E)2.5 (55.9/159.8)g

Question 19

When the equation K₂S₂O₃ + I₂ → K₂S₄O₆ + KI is balanced with the smallest integer coefficients,the coefficient of KI is:

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

Question 20

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients?
K₂O + H₂O → KOH

A)2
B)6
C)3
D)8
E)4

Question 21

What volume of 2.0 M HCl,in mL,is required to dissolve a 10.0 g piece of Zn?
Zn(s)+ 2 HCl → ZnCl₂ + H₂(g)

A)76 mL
B)330 mL
C)170 mL
D)310 mL
E)150 mL

Question 22

Potassium superoxide (KO₂)can simulate a plant-type action by consuming carbon dioxide (CO₂)gas and releasing oxygen (O₂)gas.The other product is potassium carbonate (K₂CO₃).When the equation for this process is balanced,it shows that:

A)3 mol oxygen is produced per mol KO₂ consumed
B)2 mol KO₂ is consumed per mol carbon dioxide
C)moles of reactants equals moles of product
D)3 g of oxygen is produced per 2 g CO₂ consumed
E)moles of products exceed moles of reactants

Question 23

If 5.97 mL of a solution of NaCl contains 2.54 mg of sodium ion,what is the molarity of the sodium chloride solution?

A)0.425 M
B)1.85 × 10^-2 M
C)1.85 × 10^-5 M
D)7.28 × 10^-3 M
E)0.102 M

Question 24

Which of the following represents a 1.00 M aqueous solution of glucose (C₆H₁₂O₆)?

A)90.0 g glucose per 500 mL water
B)10.0 g glucose per 10.0 mL water
C)0.180 g glucose per mL solution
D)0.100 g glucose per mL solution
E)4.5 g glucose per 4.5 g water

Question 25

Given the following reaction:
Na₂SO₄(s)+ 2 C(s)→ Na₂S(s)+ 2 CO₂(g)
How many grams of carbon are required to produce 18.4 g Na₂S(s)?

A)11.3 g
B)5.66 g
C)2.83 g
D)239 g
E)142 g

Question 26

If 85.6 mL of a 6.75 M solution are diluted to 6.20 L with water,what is the concentration of the final solution?

A)6.75 (6.20/85.6)M
B)6.75 (8.56/6.20)M
C)6.75 (6200/85.6)M
D)6.75 (85.6/6200)M
E)8.56 (6.20/6.75)M

Question 27

Given the reaction:
2KMnO₄ + 10 KI + 8 H₂SO₄ → 6 K₂SO₄ + 2 MnSO₄ + 5 I₂ + 8 H₂O
How many moles of H₂SO₄ are required to produce 2.0 moles of I₂,given the other reactants are in excess?

A)0.80 mol
B)1.3 mol
C)3.2 mol
D)4.0 mol
E)1.6 mol

Question 28

45.8 mL of a 3.14 M sodium chloride solution were used to react completely with 50.0 mL of an aqueous silver nitrate solution.What is the molarity of the silver nitrate solution?

A)2.88 M
B)1.50 M
C)3.14 M
D)3.42 M
E)1.71 M

Question 29

52.5 mL of a solution were diluted to a volume of 6.25 L and then had a concentration of 3.16 M.What was the molarity of the initial solution?

A)3.16(52.5/6.25)M
B)3.16(6.25/52.5)M
C)(3.16)(52.5)(6.25)M
D)3.16(52.5/6250)M
E)(6.25)(3.16)/0.0525 M

Question 30

What volume of 6.0 M sulfuric acid is required for the preparation of 500.0 mL of 0.30 M solution?

A)100 mL
B)50 mL
C)40 mL
D)30 mL
E)25 mL

Question 31

Which of the following processes could theoretically produce the maximum mass of oxygen per gram of metal salt reactant?

A)2 KClO₃ → 2 KCl + 3 O₂
B)4 KO₂ + 2 CO₂ → 2 K₂CO₃ + 3 O₂
C)2 Na₂O₂ + 2 H₂SO₄ → 2 H₂O + O₂
D)2 HgO → 2 Hg + O₂
E)NaBrO₂ → NaBr + O₂

Question 32

A 1.900 g sample of C₆H₁₂ is burned in an excess of oxygen.What mass of CO₂ and H₂O should be obtained?

A)0.994 g CO₂,0.407 g H₂O
B)2.98 g CO₂,1.22 g H₂O
C)5.96 g CO₂,2.44 g H₂O
D)10.45 g CO₂,4.27 g G H₂O
E)5.23 g CO₂,2.38 g H₂O

Question 33

24.0 g of ethane (C₂H₆)are burned to form CO₂ and H₂O.How many grams of CO₂ are produced?

A)32.8 g
B)14.4 g
C)43.2 g
D)35.1 g
E)70.3 g

Question 34

Iron metal reacts with chlorine gas as follows:
2 Fe(s)+ 3 Cl₂(g)→ 2 FeCl₃(s)
How many moles of FeCl₃ are obtained when 4.6 mol of Cl₂ reacts with excess Fe?

A)3.1 mol
B)4.6 mol
C)1.5 mol
D)2.3 mol
E)6.9 mol

Question 35

What mass of trisodium phosphate is required to prepare 250.0 mL of a solution that is
In sodium ion?

A)37 g
B)12 g
C)7.7 g
D)4.1 g
E)3.0 g

Question 36

For the reaction symbolized as HCl(aq)+ NaOH(aq)→ NaCl(aq)+ H₂O(l)water is both:

A)a reactant and the solute
B)a reactant and the solvent
C)a product and the solute
D)a product and the solvent
E)a liquid and the intermediate

Question 37

How many mL of 0.024 M solution can be produced from 14.1 mL of 3.0 M solution?

A)(14.1)(0.024)(3.0)mL
B)14.1(0.024/3.0)mL
C)14.1(3.0/0.024)mL
D)(14.1/0.024)/3.0 mL
E)(0.024×3)/14.1 mL

Question 38

Gases emitted during volcanic activity often contain high concentrations of hydrogen sulfide and sulfur dioxide.These gases may react to produce deposits of sulfur according to the equation:
For the complete reaction of 6.41 mol of hydrogen sulfide:

A)308 g of sulfur is formed
B)410 g of sulfur dioxide is consumed
C)231 g of water vapor is produced
D)320 g of total products result
E)628 g of total reactants are consumed

Question 39

What is the molarity of 10.9 g KCl dissolved in 150.0 mL of water?

A)0.0727 M
B)0.146 M
C)0.975 M
D)0.0219 M
E)0.667 M

Question 40

What volume of concentrated acetic acid
Is needed to prepare 250 mL of a 0.30 M aqueous solution?

A)4.7 mL
B)4.3 mL
C)3.0 mL
D)2.5 mL
E)2.2 mL

Question 41

Consider the gaseous reaction:
N₂H₄(g)+ 3 O₂(g)→ 2 NO₂(g)+ 2 H₂O(g)
If the above reaction has a percent yield of 98.5%,what mass in grams of oxygen is needed to produce 49.0 g of NO₂(g),assuming an excess of N₂H₄?

A)50.4 g
B)51.9 g
C)25.9 g
D)23.1 g
E)11.5 g

Question 42

How many grams of CrSO₄ will be made from 25.0 grams each of Zn,K₂Cr₂O₇,and H₂SO₄?
4 Zn + K₂Cr₂O₇ + 7 H₂SO₄ → 4 ZnSO₄ + 2 CrSO₄ + K₂SO₄ + 7 H₂O

A)10.8 g
B)28.3 g
C)25.2 g
D)12.6 g
E)37.8 g

Question 43

The Haber Process for the production of ammonia is represented by:
3 H₂(g)+ N₂(g)→ 2 NH₃(g)
If a mixture of 30 g of hydrogen with 10 g of nitrogen produced 8.4 g of ammonia,what was the percent yield?

A)84%
B)69%
C)49%
D)28%
E)20%

Question 44

Cryolite is a compound needed for the Hall-Heroult process for producing aluminum.Cryolite is produced by the following reaction:
6 HF + Al(OH)₃ + 3 NaOH → Na₃AlF₆ + 6 H₂O
How many grams of cryolite are produced if the reaction has a 94.3% yield and a limiting reagent of 27.8 grams of HF?

A)275 g
B)48.6 g
C)45.9 g
D)15.0 g
E)15.9 g

Question 45

Given the following reactions:
Fe + Br₂ → FeBr₂
3 FeBr₂ + Br₂ → Fe₃Br₈
If each reaction is 82.0% efficient,what mass of iron is necessary to make 8.45 g of Fe₃Br₈?

A)0.870 g
B)3.73 g
C)2.14 g
D)1.75 g
E)2.61 g

Question 46

How many grams of ZnSO₄ will be made from 41.0 grams each of Zn,K₂Cr₂O₇,and H₂SO₄?
4 Zn + K₂Cr₂O₇ + 7 H₂SO₄ → 4 ZnSO₄ + 2 CrSO₄ + K₂SO₄ + 7 H₂O

A)67.6 g
B)38.6 g
C)101 g
D)20.6 g
E)82.5 g

Question 47

How many grams of a solid mixture containing strontium chloride would one need to make 558 mL of a 0.100 M strontium chloride solution,if the solid mixture contains 58.6% strontium chloride by weight?

A)6.62 g
B)15.1 g
C)8.85 g
D)5.19 g
E)9.52 g

Question 48

If 0.500 mol of CaCl₂ is mixed with 0.200 mol Na₃PO₄,the maximum amount in moles of Ca₃(PO₄)₂ that can be formed is:

A)0.17
B)0.20
C)0.10
D)0.67
E)0.50

Question 49

The Haber Process for the production of ammonia is represented by:
3 H₂(g)+ N₂(g)→ 2 NH₃(g)
If 30 g of hydrogen is mixed with 10 g of nitrogen and the extent of reaction is 0.247,what is the amount of ammonia produced?

A)4.19 g
B)2.47 g
C)7.41 g
D)8.41 g
E)3.70g

Question 50

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients?
Al + Fe₂O₃ → Al₂O₃ + Fe

A)4
B)6
C)12
D)9
E)8

Question 51

Given the reaction:
P₄(l)+ 6 Cl₂(g)→ 4 PCl₃(l)
If the percent yield is 82%,what mass of P₄ is required to obtain 2.30 g PCl₃ (Cl₂ in excess)?

A)0.63 g
B)0.52 g
C)0.43 g
D)0.16 g
E)0.95 g

Question 52

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients?
CaC₂(s)+ H₂O(l)→ Ca(OH)₂(s)+ C₂H₂(g)

A)8
B)4
C)5
D)10
E)9

Question 53

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients?
KClO₃(s)→ KCl(s)+ O₂(g)

A)11
B)10
C)5
D)7
E)6

Question 54

One source of iodine is sodium iodate.Iodine is produced by a series of reactions.The first reaction is a reduction reaction with sodium hydrogen sulfite.
IO₃^-( aq)+ 3 HSO₃^- (aq)→ I^- (aq)+ 3 SO₄^2- (aq)+ 3 H⁺(aq)
5 I^- (aq)+ IO₃^- (aq)+ 6 H⁺ (aq)→ 3 I₂(s)+ 3 H₂O
How many grams of iodine are produced from 1.00 × 10² grams of NaHSO₃ if each reaction has a 95.0% yield?

A)48.8 g
B)51.4 g
C)185 g
D)46.3 g
E)44.0 g

Question 55

42.6 g Cu are combined with 84.0 g of HNO₃ according to the reaction:
3 Cu + 8 HNO₃ → 3 Cu(NO₃)₂ + 2 NO + 4 H₂O
Which reagent is limiting and how many grams of Cu(NO₃)₂ are produced?

A)Cu,93.8 g
B)HNO₃,93.8 g
C)Cu,125.6 g
D)HNO₃,125.6 g
E)Cu(NO₃)₂,125.6 g

Question 56

For the reaction
The stoichiometric number for Al₂O₃ is:

A)+2
B)+1
C)-1
D)-2
E)0

Question 57

Given the reaction:
How many moles of K₂SO₄ are produced by allowing five moles each of KMnO₄,KI,and H₂SO₄ to react?

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

Question 58

If 8.52 g each of zinc,potassium dichromate,and sulfuric acid are reacted by the reaction:
4 Zn + K₂Cr₂O₇ + 7 H₂SO₄→ 4 ZnSO₄ + 2 CrSO₄ +K₂SO₄ + 7 H₂O
How many grams of potassium dichromate will be left unreacted?

A)1.05 g
B)2.84 g
C)7.30 g
D)4.87 g
E)3.65 g

Question 59

If 0.500 mol of CaCl₂ is mixed with 0.200 mol Na₃PO₄,the maximum amount in moles of Ca₃(PO₄)₂ that can be formed is 0.10 moles.Calculate the extent of reaction ,x.

A)0.2
B)0.10
C)0.35
D)0
E)0.65

Question 60

For the reaction
And 7.2 g of Fe₂O₃ (159.8 g/mol)produce 5.03 g of Fe (55.9 g/mol).Calculate the extent of reaction ,x.

A)0.362
B)0.089
C)0.045
D)0.092
E)0.405

Question 61

"Washing soda" (sodium carbonate)may be used to "soften" water by the removal of certain ions that would otherwise react with common soaps.When the "hardness" is due to calcium ion,the "softening" process may be represented as:
Ca²⁺(aq)+ CO₃^2-(aq)→ CaCO₃(s)
What mass of sodium carbonate would be required to remove essentially all of the calcium ion from 750 L of solution containing 43 mg Ca²⁺ per liter?

A)85 g
B)67 g
C)12 g
D)48 g
E)22 g

Question 62

If an aqueous solution containing 46 g of sodium carbonate per liter is mixed with an equal volume of 0.20 M aqueous hydrochloric acid,what would be the molarity of sodium chloride in the final solution,assuming volumes were additive?

A)0.10 M
B)0.20 M
C)0.22 M
D)0.43 M
E)0.50 M

Question 63

What is the molarity of a sucrose solution (C₁₂H₂₂O₁₁)if 110.0 g of a 92.0% pure solid is dissolved per 250.0 mL of water?

A)0.296 M
B)1.29 M
C)0.321 M
D)1.40 M
E)1.18 M

Question 64

Write the complete balanced equation for the complete combustion reaction expected to occur between C₃H₇OH and O₂.

A)C₃H₇OH + O₂ → 3 CO₂ + 4 H₂O
B)3 C₃H₇OH + 9 O₂ → 6 CO₂ + 8 H₂O + 3 C
C)2 C₃H₇OH + 6 O₂ → CO + 8 H₂O
D)2 C₃H₇OH + 9 O₂ → 6 CO₂ + 8 H₂O
E)2 C₃H₇OH + 9 O₂ → 6 C + 8 H₂ + 10 O₂

Question 65

What is the molarity of formaldehyde in a solution containing 0.25 g of formaldehyde (CH₂O)per mL?

A)2.5 M
B)25 M
C)8.3 M
D)83 M
E)4.0 M

Question 66

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients?
H₂(g)+ O₂(g)→ H₂O(l)

A)4
B)5
C)8
D)9
E)7

Question 67

The chemical reaction occurring during the discharge of a lead storage battery can be represented by the equation:
What mass of lead sulfate would result from the complete reaction of 41.4 g of lead?

A)57.6 g
B)60.5 g
C)105 g
D)115 g
E)121 g

Question 68

What is the molarity of methanol,
If 150.0 mL is dissolved in enough water to make 4.00 L of solution?

A)3.71 M
B)1.17 M
C)1.48 M
D)0.927 M
E)0.734 M

Question 69

Our task is to measure the volume of blood in an elephant.One way to do this would be to drain its blood into a suitable container.Aside from harmful side effects which this method has on the elephant,it will not be successful,as blood will still remain behind in the tissues.Hence,we will inject 2.00 ml of a 2.00 M solution of a dye which the elephant will not appreciably metabolize or excrete in one hour and then measure the concentration of this dye in the bloodstream (our sample being taken from another leg than the point of injection)after 30 minutes,a sufficient time to thoroughly mix the dye in the bloodstream.The concentration of dye at this point is
What is the volume of blood in the elephant?

A)320 L
B)320000 L
C)3.2 L
D)80 L
E)800 L

Question 70

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients?
CH₃OH → CO + H₂

A)3
B)8
C)5
D)4
E)7

Question 71

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients?
Al(s)+ HCl(aq)→ AlCl₃(aq)+ H₂(g)

A)13
B)11
C)18
D)19
E)21

Question 72

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients?
C₂H₆ + O₂ → CO₂ + H₂O

A)5
B)10
C)19
D)21
E)25

Question 73

You have 10.00 L of a 0.350 M KCl solution,but you need a solution that is 0.450 M.What volume of water,in L,would you evaporate from the solution?

A)4.38 L
B)3.50 L
C)2.85 L
D)7.77 L
E)2.22 L

Question 74

What mass of MgCl₂ in grams must be added to 250.0 mL of a 0.25 M MgCl₂ solution to produce a 0.40 M solution,assuming no change of volume upon addition?

A)9.5 g
B)6.0 g
C)2.2 g
D)3.6 g
E)19 g

Question 75

What is the sum of the coefficients when the following equation is balanced with the smallest integer coefficients?
H₂SO₃ + Al(OH)₃ → Al₂(SO₃)₃ + H₂O

A)4
B)5
C)11
D)12
E)14

Question 76

What mass of water is produced in the metathesis reaction 75.2 g Zn(OH)₂ with 43.4 g HCl?

A)13.6 g
B)27.3 g
C)10.7 g
D)21.4 g
E)31.8 g

Question 77

The molarity of a solution that contains 14.7 g of H₂SO₄ in 200.0 mL solution is ________.

A)1.5 M
B)0.75 M
C)0.77 M
D)7.4 M
E)3.0 M

Question 78

How much Cl₂,in g,is required to produce 12.0 g CCl₄ according to the following reaction?

A)12.0 g
B)5.52 g
C)22.1 g
D)1.38 g
E)11.0 g

Question 79

What mass of oxygen gas would be consumed by the complete combustion of 7.5 g of a mixture of propane (C₃H₈)and butane (C₄H₁₀)in the mole ratio of

A)3.9 g
B)11 g
C)14 g
D)21 g
E)27 g

Question 80

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients?
PCl₃(l)+ Cl₂(g)+ P₄O₁₀(s)→ POCl₃(l)

A)3
B)18
C)45
D)10
E)23