Deck 4: Chemical Reactions and Equations

Question 1

CO₂ is a reactant in the chemical equation 2C₂H₆ + 7O₂ $\rightarrow$ 4CO₂ + 6H₂O.

Answer 1

False

Question 2

Calcium can react with LiNO₃ to replace Li and form calcium nitrate.

Answer 2

False

Question 3

When replacing cations in single displacement reactions, chemical reactivity trends can be predicted simply by using their relative positions on the periodic table.

Answer 3

False

Question 4

The chemical equation CH₄ + O₂ $\rightarrow$ CO₂ + H₂O cannot be balanced to form a proper equation.

Question 5

A decomposition reaction starts from a single substance and produces more than one substance.

Question 6

Iron can replace aluminum by undergoing a single-replacement reaction.

Question 7

Any ionic compound that is formed from a reaction between an acid and a base is called a salt.

Question 8

CaCl₂ dissociates to form one Ca²⁺ ions and one Cl^2- ion.

Question 9

Lead (II) carbonate (PbCO₃) cannot be dissolved in water.

Question 10

A precipitation reaction occurs when two ionic compounds are dissolved in water and form a new ionic compound that does not dissolve.

Question 11

A decomposition reaction generates more than one product from a single reactant.

Question 12

The reaction, C₃H₈ $\rightarrow$ C₃H₄ + 2H₂, is an example of a combustion reaction

Question 13

The equation, H₂ + O₂ $\rightarrow$ H₂O, is not balanced.

Question 14

H₃O⁺ is called trihydroxo ion.

Question 15

Iodide is an example of a halogen.

Question 16

Acids and bases neutralize to produce a salt compound and water.

Question 17

Generally, all compounds of NO₃⁻ and C₂H₃O₂⁻ dissolve in water.

Question 18

Li₃PO₄ cannot be dissolved in water.

Question 19

A double-replacement reaction occurs when parts of two ionic compounds are exchanged to make two new compounds.

Question 20

Neutralization reactions do not proceed if one of the reactants is not in the aqueous phase.

Question 21

Identify a double-replacement reaction from the following.

A) Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂
B) Fe + Cu(NO₃)₂ → Fe(NO₃)₂ + Cu
C) Ca + 2H₂O → Ca(OH)₂ + H₂
D) Zn + 2HCl → ZnCl₂ + H₂
E) CuCl₂ + 2AgNO₃ → Cu(NO₃)₂ + 2AgCl

Question 22

A _____ reaction occurs when two ionic compounds are dissolved in water and form a new ionic compound that does not dissolve.

A) precipitation
B) contamination
C) condensation
D) diffusion
E) dispersion

Question 23

Reduction is defined as the gain of one or more electrons by an atom.

Question 24

Consider the equation, 2H₂ + O₂ → 2H₂O. Here, H₂ and O₂ are called _____.

A) reactants
B) products
C) catalysts
D) modules
E) alkalis

Question 25

Identify an element that cannot replace iron through a single-replacement reaction.

A) Potassium
B) Lithium
C) Calcium
D) Copper
E) Aluminum

Question 26

Which of the following compounds is not likely to dissolve in water?

A) HCl
B) AgCl
C) NaCl
D) KI
E) RbBr

Question 27

Identify the products if a double-replacement reaction occurs here. 2AgNO₃ + ZnCl₂ →?

A) Zn(NO)₂ + 2Ag + 2Cl₂
B) Zn(NO)₂ + 2AgCl₂
C) Ag₂Cl + Zn(NO₃)₂
D) 2AgCl + Zn(NO₃)₂
E) Ag₂Zn + N₂ + 3O₂

Question 28

In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. This principle is formed in accordance with the _____.

A) law of identity
B) second law of thermodynamics
C) law of conservation of matter
D) law of attraction of materials
E) third law of thermodynamics

Question 29

Which of the following is the balanced chemical equation that represents nitrogen and hydrogen reacting to produce ammonia?

A) N₂ + 2H₃ $\rightarrow$ 2NH₃
B) N₂ + 3H₂ $\rightarrow$ 2NH₃
C) N₃ + 7H₂ + O₂ $\rightarrow$ 3NH₃ + 2H₂O + H⁺
D) N₃ + 5H₂ $\rightarrow$ 3NH₃ + H⁺
E) N₂ + 3H₂ $\rightarrow$ NH₃ +H₃N

Question 30

Which of the following carbonates can be dissolved in water?

A) CaCO₃
B) FeCO₃
C) NiCO₃
D) (NH₄)₂CO₃
E) Al₂(CO₃)₃

Question 31

Which of the following elements is a halogen?

A) Iodine
B) Helium
C) Neon
D) Hydrogen
E) Lithium

Question 32

_____ rules are general statements that predict which ionic compounds dissolve and which do not.

A) Composition
B) Dissociation
C) Solubility
D) Combustibility
E) Decomposition

Question 33

An unbalanced chemical equation can be balanced by _____.

A) changing the number of atoms in the product
B) adding oxygen molecules in either sides of the equation
C) changing the mass number of the molecules that react or are produced
D) changing the number of molecules that react or are produced
E) adding hydrogen ions in either sides of the equation

Question 34

Atoms in their elemental state are assigned an oxidation number of 1.

Question 35

Oxidation and reduction always occur together in reality.

Question 36

Which of the following elements is likely to replace potassium (K) through a single-replacement reaction?

A) Lithium
B) Calcium
C) Sodium
D) Magnesium
E) Aluminum

Question 37

Oxidation is defined as the gain of one or more protons by an atom.

Question 38

Identify the chemical reaction for which no reaction can be predicted.

A) FeCl₂ + Zn → ?
B) Fe + Cu(NO₃)₂ → ?
C) FeCl₂ + Cu → ?
D) Cl₂ + 2NaBr → ?
E) AlPO₄ + Mg → ?

Question 39

Which of the following compounds dissolves in water?

A) AgCl
B) CaCO₃
C) HgCl₂
D) PbI₂
E) Ba(OH)₂

Question 40

The oxidation number of oxygen molecule (O₂) is -2.

Question 41

A _____ reaction produces a single substance from multiple reactants.

A) synthesis
B) decomposition
C) neutralization
D) combustion
E) diffusion

Question 42

Which of the following is an example of a combustion reaction?

A) 2HBr + Cl₂ → 2HCl + Br₂
B) C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
C) 2CO₂ + 3H₂O → C₂H₅OH + 3O₂
D) Na₂CO₃ →Na₂O + CO₂
E) Na₂O + CO₂ → Na₂CO₃

Question 43

Which of the following ions are formed when AgNO₃ dissociate?

A) N^2-
B) N^3-
C) AgN^2-
D) O^2-
E) NO₃^-

Question 44

A(n) _____ reaction occurs when a reactant combines with oxygen, many times from the atmosphere, to produce oxides of all other elements as products.

A) synthesis
B) decomposition
C) neutralization
D) combustion
E) diffusion

Question 45

Identify a product obtained from the combustion reaction of ammonia.

A) N₂
B) O₂
C) CO₂
D) H₂O
E) H₂

Question 46

Which of the following chemical equations represents a decomposition reaction?

A) C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
B) 2HBr + Cl₂ → 2HCl + Br₂
C) Na₂CO₃ →Na₂O + CO₂
D) H₂ + Cl₂ → 2HCl
E) Na₂O + CO₂ → Na₂CO₃

Question 47

A _____ reaction starts from a single substance and produces more than one substance.

A) synthesis
B) diffusion
C) combustion
D) neutralization
E) decomposition

Question 48

A(n) _____ is any compound that increases the amount of hydrogen ion (H⁺) in an aqueous solution.

A) metal
B) salt
C) acid
D) base
E) mineral

Question 49

How many ions are formed when MgSO₄ dissociates?

A) 2
B) 3
C) 4
D) 5
E) 7

Question 50

The reaction of an acid and a base is called a _____ reaction.

A) synthesis
B) combustion
C) decomposition
D) carbonation
E) neutralization

Question 51

Which of the following represents a hydronium ion?

A) H₃O⁺
B) H⁺
C) H²⁺
D) H^-
E) OH^-

Question 52

Which of the following is not an ionic compound?

A) CaCO₃
B) NH₃
C) NaCl
D) KBr
E) CuS

Question 53

Which of the following is the precipitate in the possible double-replacement reaction between Na₂SO₄ and SrCl₂?

A) Strontium sulfate
B) Sodium hydride
C) Sodium chloride
D) Strontium carbonate
E) Sodium oxide

Question 54

When ionic compounds dissolve, the ions physically separate from each other. This process is called _____.

A) composition
B) dissociation
C) diffusion
D) combustion
E) decomposition

Question 55

A chemical equation with the spectator ions removed is called a(n) _____ equation.

A) spectator ionic
B) balanced
C) unbalanced
D) complete ionic
E) net ionic

Question 56

Which of the following is an example of a synthesis reaction?

A) 2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O
B) BaSO₄ → Ba²⁺ + SO4²⁻
C) 2H₂ + O₂ → 2H₂O
D) C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
E) 4NH₃ + 3O₂ → 2N₂ + 6H₂O

Question 57

Consider the reaction NaCl + AgNO₃. Which of the following is a spectator ion in this ionic reaction?

A) Cl⁻
B) Ag⁺
C) Na⁺
D) N^3-
E) O^2-

Question 58

Which of the following is a common product of combustion reactions?

A) H₂
B) CO₂
C) O₂
D) N₃
E) CH₄

Question 59

A base is a compound that increases the amount of _____ ion in an aqueous solution.

A) oxide
B) hydroxide
C) hydrogen
D) hydride
E) hydronium

Question 60

An ion that does nothing in the overall course of a chemical reaction is called a(n) _____ ion.

A) balanced
B) neutral
C) nonaligned
D) spectator
E) intermediate

Question 61

In the compound calcium chloride, what is the oxidation number given to chloride?

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

Question 62

Which of the following terms refer to an ionic compound that is formed from a reaction between an acid and a base?

A) salt
B) polymer
C) alkali
D) soap
E) hydroxide

Question 63

Consider the chemical reaction, Fe + CuSO₄ → FeSO₄ + Cu. Which of the following is being oxidized here?

A) SO₄
B) O
C) S
D) Cu
E) Fe

Question 64

A chemical reaction in which a single substance is produced from multiple reactants is called a(n) _____.

Question 65

The _____ are the elements in the next-to-last column on the periodic table.
Halogens;

Question 66

The chemical reaction represented by the equation HCl + KOH $\rightarrow$ H₂O + KCl is an example of a(n) _____ reaction.

A) combustion
B) neutralization
C) synthesis
D) decomposition
E) composition

Question 67

A chemical equation in which the dissolved ionic compounds are written as separated ions is called a(n) _____.

Question 68

A(n) _____ is a chemical reaction in which a reactant combines with oxygen to produce oxides of all other elements as products.

Question 69

Initial substances in a chemical equation are called _____.

Question 70

_____ are general statements that predict which ionic compounds dissolve and which do not.

Question 71

_____ is the process of an ionic compound separating into ions when it dissolves.

Question 72

The _____ lists the elements that will replace elements below them in single replacement reactions.

Question 73

Final substances in a chemical equation are called _____.

Question 74

The process of losing one or more electrons by an atom is called _____.

A) neutralization
B) dehydration
C) oxidation
D) reduction
E) synthesis

Question 75

A compound that increases the amount of H⁺ ions in an aqueous solution is called a(n) _____.

Question 76

A(n) _____ is a compound that increases the amount of OH⁻ ions in an aqueous solution.

Question 77

Chemical reactions that involve the transfer of electrons are called _____ reactions.

A) synthesis
B) combustion
C) composition
D) neutralization
E) redox

Question 78

Which of the following rules is valid when assigning oxidation numbers to atoms?

A) Atoms in their elemental state are assigned an oxidation number of 1.
B) Atoms in the form of molecules have an oxidation number of 1.
C) Hydrogen is assigned a +1 oxidation number when it exists as the hydride ion
D) Atoms in monatomic ions are assigned an oxidation number equal to their charge.
E) Oxygen and hydrogen are usually assigned an oxidation number of zero.

Question 79

When an oxidation number of an atom is decreased in the course of a reaction, that atom is being _____.

A) synthesized
B) neutralized
C) oxidized
D) decomposed
E) reduced

Question 80

_____ is a chemical reaction in which one element is substituted for another element in a compound.