Question 1

Which type of chemical reaction is illustrated by the formation of magnesium oxide from magnesium and oxygen, as shown in the first image?

Accepted Answer

Synthesis (combination) reaction

Question 2

Given the reaction $$2 HgO (s) \xrightarrow{\Delta} 2 Hg (l) + O_2$ (g)$$, which type of reaction is this and what is the main characteristic?

Accepted Answer

Decomposition; one reactant forms two or more products

Question 3

In the reaction $$Zn (s) + 2 HCl (aq) \rightarrow $$ZnCl_2$$ (aq) + H_2$ (g)$$, which element is oxidized and which is reduced?

Accepted Answer

Zn is oxidized, H is reduced

Question 4

Which reaction type is represented by $$Na_2SO_4 (aq) + $$BaCl_2$$ (aq) \rightarrow $$BaSO_4$$ (s) + 2 NaCl (aq)$$, as shown in the fourth image?

Accepted Answer

Double replacement reaction

Question 5

Rust formation on tools, as shown in the fifth image, is an example of which type of chemical reaction?

Accepted Answer

Oxidation-reduction (redox) reaction

Question 6

According to the sixth image, what happens to sodium ($$Na) $$during oxidation?

Accepted Answer

$$Na$$ loses electrons to become $$Na^+$$

Question 7

Which of the following best describes the oxidation of an aldehyde in organic chemistry, as shown in the seventh image?

Accepted Answer

Addition of oxygen to form a carboxylic acid

Question 8

In aerobic metabolism, as shown in the eighth image, what is the main advantage of stepwise oxidation of sugar compared to direct burning?

Accepted Answer

Stepwise oxidation allows energy to be captured and stored

Question 9

Which reaction type is represented by the burning of wood in a campfire, as shown in the ninth image?

Accepted Answer

Combustion reaction

Question 10

In the reaction $$NAD(P)^+ + H^- \rightarrow NAD(P)H$$, as shown in the tenth image, what process is occurring?

Accepted Answer

Reduction of NAD(P)^+

Question 11

In the eleventh image, the iron atom in cytochrome c is shown undergoing a change from $$Fe^{2+} to$$ $$Fe^{3+}. $$What type of reaction is this?

Accepted Answer

Oxidation

Question 12

Which of the following reactions is an example of a single replacement reaction?

Accepted Answer

$$Cu (s) + 2 $$AgNO_3$$ (aq) \rightarrow Cu(NO_3$)_2 (aq) + 2 Ag (s)$$

Question 13

Which statement about reversible reactions is correct?

Accepted Answer

At equilibrium, the rates of forward and reverse reactions are equal

Question 14

Which of the following is true about oxidation-reduction reactions in metabolism?

Accepted Answer

Electrons are transferred from metabolites to electron carriers

Question 15

In organic chemistry, which change indicates reduction?

Accepted Answer

Addition of hydrogen atoms

Question 16

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

Accepted Answer

$$C_2H_5OH (l) + 3 O_2$ (g) \rightarrow 2 CO_2$ (g) + 3 H_2O (g)$$

Question 17

Which statement best describes the role of cytochrome c in aerobic metabolism?

Accepted Answer

It transfers electrons via oxidation and reduction of iron

Question 18

Which of the following is a characteristic of irreversible reactions?

Accepted Answer

They typically have a large negative $$\Delta G$$

Question 19

In the reaction $$4 Fe (s) + 3 O_2$ (g) \rightarrow 2 Fe_2O_3 (s)$$, what is the oxidation state change for iron?

Accepted Answer

Iron is oxidized from $$Fe^0 to$$ $$Fe^{3+}$$

Question 20

Which of the following best describes the process of ATP generation in cells?

Accepted Answer

ATP is generated by stepwise oxidation of metabolites, transferring electrons to carriers

Chemical Reactions and Oxidation-Reduction: A Mini-Textbook Study Guide

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