Deck 5: Reactions

Question 1

What will you observe if you mix a solution of KOH with a solution of MgI₂ in the reaction below?

A) bubbles of KI will form
B) a solid of Mg(OH)₂ will settle in reaction vessel
C) a solid of KOH will form
D) a clear solution will form

Answer 1

a solid of Mg(OH)₂ will settle in reaction vessel

Question 2

Which set of coefficients properly balance the equation below, going from reactants to products?

A) 1,2,1,4
B) 2,1,1,2
C) 2,2,3,1
D) 1,2,2,1

Answer 2

2,1,1,2

Question 3

Lithium is a metal that reacts vigorously with oxygen. Which set of coefficents balance the equation below?

A) 1,2,1
B) 2,2,1
C) 1,2,2
D) 4,1,2

Answer 3

4,1,2

Question 4

In chemical reaction

A) the covalent bonds and ionic bonds that hold elements and compounds together remain intact as new bonds are formed
B) the covalent and ionic bonds that hold elements and compounds together are broken and no new bonds are formed
C) the covalent and ionic bonds that hold elements and compounds together are broken and new bonds are formed
D) neither new bonds are formed nor old bonds broken

Question 5

Balance the equation and list the coefficients in the balanced equation below, going from reactants to products.

A) 2,1,1,1
B) 2,2,1,1
C) 1,1,2,1
D) 1,2,1,2

Question 6

When properly balanced with whole number coefficients, what is the coefficient on H₂O?
____HCl + ____Ba(OH)₂ $\rightarrow$ ___BaCl₂ + ___H₂O

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

Question 7

When properly balanced with whole number coefficients, what is the coefficient on N₂ ?

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

Question 8

Aluminum will react slowly with the oxygen in the air. When the equation below is balanced, with whole number coefficients, what is the coefficient on aluminum oxide?

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

Question 9

Pentose, C₅H₁₀O₅, reacts with oxygen to produce carbon dioxide and water. What is the coefficient on O₂ when the equation below is properly balanced?

A) 3
B) 5
C) 7
D) 15

Question 10

Which set of coefficients properly balance the equation below?

A) 1,1,5,6
B) 1,5,5,6
C) 1,5,5,1
D) 1,8,5,6

Question 11

Which set of coefficients properly balance the equation below, going from reactants to products?

A) 1,3,2,3
B) 1,7,4,3
C) 2,7,4,6
D) 2,3,2,3

Question 12

Classify the reaction below as involving synthesis, decomposition, single replacement, or double replacement.

A) single replacement
B) double replacement
C) decomposition
D) synthesis

Question 13

Classify the reaction below as involving synthesis, decomposition, single replacement, or double replacement.

A) single replacement
B) double replacement
C) synthesis
D) decomposition

Question 14

Classify the reaction below as involving synthesis, decomposition, single replacement, or double replacement.

A) double replacement
B) single replacement
C) decomposition
D) synthesis

Question 15

Classify the reaction below as involving synthesis, decomposition, single replacement, or double replacement.

A) synthesis
B) single replacement
C) double replacement
D) decomposition

Question 16

The following equation is an example of a ___ reaction.

A) synthesis
B) decomposition
C) single replacement
D) double replacement

Question 17

The reaction below is an example of a ___ reaction.

A) hydrogenation
B) hydrolysis
C) dehydration
D) neutralization

Question 18

The reaction below is an example of a ___ reaction.

A) dehydration
B) hydrogenation
C) hydrolysis
D) combustion

Question 19

The reaction below is an example of a ___ reaction.

A) hydrogenation
B) hydrolysis
C) dehydration
D) hydration

Question 20

If ethene (H₂C=CH₂) were to react with water in an acid solution (H⁺ present), the result would be which of the following?

A)
B)
C)
D)

Question 21

The missing reactant is

A)
B)
C)
D)

Question 22

2-methylcyclopentene reacts with hydrogen in the presence of platinum catalyst to form methylcyclopentane.
In this reaction:

A) 2-methylcyclopentene is reduced
B) Pt is oxidized
C) methylcyclopentane is reduced
D) cyclohexane is oxidized

Question 23

A chemical reaction in which there is a transfer of electrons from one reactant to another reactant can be classified as

A) decomposition reaction
B) combustion reaction
C) oxidation-reduction reaction
D) double replacement reaction

Question 24

In the reaction below, which element is oxidized?

A) Mg
B) Br₂
C) neither Mg nor Br₂ is oxidized

Question 25

In the reaction below, _____.

A) Zn and S are both oxidized
B) Zn and S are both reduced
C) Zn is reduced and S is oxidized
D) Zn is oxidized and S is reduced

Question 26

In the reaction below:

A) CH₃CH₂OH is oxidized
B) CH₃CH₂OH is reduced
C)
D) CH₃CH₂OH in neither oxidized nor reduced

Question 27

In the reaction below:

A) CH₃CH=CH₂ is oxidized
B) CH₃CH=CH₂ is reduced
C) CH₃CH₂CH₃ is reduced
D) CH₃CH=CH₂ is neither oxidized nor reduced

Question 28

Barium and sulfur react to produce barium sulfide. What is the role of barium in this reaction?

A) Barium is not affected by the processes of the chemical reaction.
B) Barium is being reduced.
C) Barium serves as the reducing agent.
D) Barium is the oxidizing agent.

Question 29

Regarding the following reaction,

A) This reaction does not involve oxidation or reduction.
B) Magnesium is oxidized and nitrogen is reduced.
C) Both magnesium and nitrogen are reduced.
D) Magnesium is reduced and nitrogen is oxidized.

Question 30

What was the earliest reported method of fighting infection in the operating room?

A) The patient was treated with Betadine before surgery.
B) Carbolic acid was used on the surgeon's tools.
C) Listerine was the antiseptic of choice.
D) The surgeons washed with soap and chlorine water.

Question 31

Benzoyl peroxide can be used as a treatment for acne. Benzoyl peroxide

A) has a reduction action that tends to neutralize the effects of the acne bacteria.
B) is injected so that it will have a general immune action against bacteria causing acne.
C) is an oxidizing agent used on the skin to kill the bacteria causing acne.
D) is not used for acne; it is an antiseptic used to sterilize a surgeon's hands.

Question 32

Which reaction is NOT an oxidation-reduction reaction?

A)
B)
C)
D) All of these are oxidation-reduction reactions.

Question 33

Ethyne, C₂H₂, used in welding react with oxygen as shown below.
Which of the following is about this reaction?

A) carbon is oxidized
B) the reaction can be classified as a hydration reaction
C) C₂H₂ is the oxidizing agent
D) CO₂ is the reducing agent

Question 34

Isooctane, C₈H₁₈, a component of gasoline is a liquid at room temperature. How many moles of oxygen are required to completely react with 4 moles of isooctane?

A) 50
B) 12
C) 100
D) 25

Question 35

In the following reaction, the aldehyde has been

A) Reduced
B) Oxidized
C) Hydrolysed
D) None of these choices.

Question 36

In the following reaction, 10.0 moles of potassium would require how many moles of bromine?

A) 2.00
B) 5.00
C) 10.0
D) 20.0

Question 37

If 5.5 moles of pentane are burned according to the following equation:
how many moles of oxygen are required?

A) 41
B) 83
C) 11
D) 5.5

Question 38

According to the following equation, what mass of silver nitrate would be required to react with 0.500 grams potassium chloride?

A) 0.500 g
B) 1.14 g
C) 85.0 g
D) 170 g

Question 39

Methanol burns in air according to the equation below. How many grams of methanol can be burned by 10 grams of oxygen?

A) 2 g
B) 7 g
C) 10 g
D) 20 g

Question 40

Balance the equation below and determine the number of moles of oxygen required to completely burn 5.00 moles of propane.

A) 5.00
B) 10.0
C) 15.0
D) 25.0

Question 41

How many grams of oxygen (O₂) are needed to completely react with 24.0 g of propane (C₃H₈) according to the equation below?

A) 0.545 g
B) 2.73 g
C) 87.2 g
D) 28.8 g

Question 42

In the following reaction, how many grams of water are needed to completely hydrolyze 30.8 g of the ester?

A) 7.48 g
B) 0.416 g
C) 30.8 g
D) 11.3 g

Question 43

A test used by geologists to determine if the carbonate ion is present in rock can be performed by dripping a hydrochloric acid solution on the sample and looking for the bubbling of carbon dioxide. How many moles of carbon dioxide are produced by the reaction of 0.75 moles of limestone, CaCO₃?

A) 2.35 moles
B) 2 moles
C) 1 mole
D) 0.75 moles

Question 44

The percent yield of a reaction is determined by dividing ___ in grams or moles by the ___ in grams or moles times 100%

A) theoretical yield, actual yield
B) actual yield, theoretical yield
C) amount of reactant, amount of products
D) amount of products, amount of reactants

Question 45

If 2.00 grams of potassium are allowed to react with 2.00 grams of bromine by the following equation, which reactant is the limiting reactant?

A) K
B) Br₂
C) cannot be determined

Question 46

A chemist runs a reaction to prepare bromobenzene, C₆H₅Br, from the reaction of benzene (C₆H₆) with bromine(Br₂):
The theoretical yield of the reaction is 87 g of bromobenzene. If 68 g of bromobenzene are obtained, what is the percent yield of the reaction?

A) 93%
B) 81%
C) 78 %
D) 45%

Question 47

If there is a "limiting reactant" in the hypothetical reaction,
it is the substance

A) on the right that is produced in a limited amount.
B) on the left that is used to produce substance C on the right.
C) on the left that is used up first.
D) on the left that is limited by the amount of C produced.

Question 48

Sodium stearate is a soap that is produced from stearic acid, one of the fatty acids, by the reaction:
The reaction that was set up with 0.25 g stearic acid and an excess of sodium hydroxide produced 0.25 grams soap. The percent yield was

A) 100%.
B) 93%.
C) 25%.
D) 1%.

Question 49

What mass of potassium chloride, a salt substitute often used by heart patients, can be produced directly from 5.2 g potassium and 7.9 g chlorine?

A) 5.2 g KCl
B) 4.9 g KCl
C) 9.9 g KCl
D) 10.1 g KCl

Question 50

While this isn't a real reaction, we can say that carbonic acid, H₂CO₃, can be produced directly from the elements. Choose the statement that is correct when the given masses are supplied to react.

A) Hydrogen is the limiting reactant.
B) Carbon is the limiting reactant.
C) Oxygen is the limiting reactant.
D) There is no limiting reactant.

Question 51

Two methanol molecules can react in the presence of sulfuric acid to produce dimethyl ether. Calculate the percent yield for this reaction that was run in a laboratory starting with 50 grams methanol and producing 26 grams dimethyl ether.

A) 52%
B) 57%
C) 72%
D) 200%

Question 52

Ethene, C₂H₄, burns in air according to the equation below. What is the theoretical yield (in grams) of CO₂ when 3.24 g of C₂H₄ are reacted with 4.83 g of O₂?

A) 3.24 g
B) 9.72 g
C) 0.151 g
D) 4.43 g

Question 53

Consider the burning of methane gas (CH₄):
Which statement is true about the reaction?

A) energy is absorbed and it is non-spontaneous
B) energy is released and it is non-spontaneous
C) energy is absorbed and it is spontaneous
D) energy is released and it is spontaneous

Question 54

___ lower the ___ of a reaction and therefore increase the reaction rate.

A) reactants, temperature
B) catalysts, activation energy
C) catalysts, concentration
D) activation energy, temperature

Question 55

The catalyst utilized by biological systems for hydrogenation reactions is ___.

A) platinum
B) hydrogen
C) an enzyme
D) a carbon-carbon bond

Question 56

Figures A and B below represent reaction energy diagrams. Diagram that represents an endothermic reaction is

A) B
B) A
C) Both A and B
D) None of these choices

Question 57

In the reaction energy diagram below, the activation energy is represented by:

A) c
B) a
C) d
D) c.

Question 58

Choose the comment that is appropriate for the reaction:

A) Carbonic anhydrase catalyzes the conversion of carbon dioxide into carbonic acid.
B) The reaction runs in forward direction only.
C) This reaction runs in backward direction only.
D) This is a reaction that only occurs in the laboratory.

Question 59

The coefficients used to balance chemical equations can be interpreted in terms of atoms, moles, or grams.

Question 60

In a synthesis reaction, one compound breaks down to form elements or simpler compounds

Question 61

The reaction below can be classified as a double replacement reaction.

Question 62

Platinum serves to catalyze some hydrogenation reactions.

Question 63

In a hydrolysis reaction, water is used to split a molecule

Question 64

An oxidation reaction can be defined as when an atom loses an oxygen.

Question 65

An oxidizing agent is the reactant in an oxidation - reduction reaction that causes reduction of another reactant by providing electrons for the other reactant to accept.

Question 66

When $\Delta$ G for a reaction is +286 kcal, the reaction is spontaneous.

Question 67

Compounds are formed from elements in a ___ reaction.

Question 68

A synthesis reaction in which water is added to a double bond is called ___.

Question 69

Question 70

If the charge on an ion changes from 2+ to 4+, the process occurring is ___.

Question 71

For the following organic reactions, identify the reaction as an oxidation or reduction:
a)

b)

c)

Question 72

The measured amount of product obtained in any reaction is known as the ___.

Question 73

A reaction that releases heat is called ___.

Question 74

___ is the energy released or gained in a reaction.

Question 75

Hydrolysis, hydration and dehydration reactions can take place in our cells with the aid of ____, which are proteins that catalyze reactions.

Question 76

Aluminum carbonate was once the active ingredient in Rolaids . It reacts with stomach acid according to the following equation:

Question 77

Balance the equation. Baking soda (NaHCO₃) can be used as an antacid. It reacts with and neutralizes stomach acid (HCl). The equation for this reaction is as follows:

Question 78

Balance the equation. Tums tablets are composed of the substance calcium carbonate. Two tablets have a combined mass of 5.0 grams. Calcium carbonate reacts with and neutralizes excess stomach acid (hydrochloric acid). The products of this reaction are: water, calcium chloride, and carbon dioxide.

Question 79

Write and balance the equation for the complete combustion of pentane (C₅H₁₂).

Question 80

Write and balance the equation for the complete combustion of cyclohexane (C₆H₁₂)