Need help with chemistry homework. All multiple choice questions.
Question 1
Which of these is a redox process?
I.Rusting of ironII.RespirationIII.Burning hydrocarbons
I only
III only
I and II
I and III
I, II, and III
Question 2
During oxidation-reduction reactions, the substance that loses electrons is _____and the substance that gains electrons is _____.
oxidized; reduced
reduced; oxidized
reduced; dissolved
reduced; accelerated
oxidized; dissolved
Question 3
Which of these occurs(s) during reduction?
Gaining electrons
Gaining hydrogen
Losing oxygen
All of these
None of these
Question 4
Which of these occur(s) during oxidation?
I.Gaining electronsII.Losing hydrogenIII.Losing oxygen
I only
II only
I and II
II and III
I, II, III
Question 5
Which of these occur(s) during oxidation?
Gaining electrons
Gaining hydrogen
Losing oxygen
All of these
None of these
Question 6
Which of these statements about redox reactions is incorrect?
Oxidation is the loss of oxygen.
Oxidation is the loss of electrons.
Reduction is the gain of electrons.
Oxidation is the loss of hydrogen.
Reduction is the gain of hydrogen.
Question 7
Redox reactions involve the transfer of _____.
hydrogen
oxygen
protons
electrons
neutrons
Question 8
Which substance is oxidized in this redox reaction?
Br−(aq) + MnO4−(aq) → Br2(l) + Mn2+(aq)
Br −
MnO4−
Br2
Mn2+
None of these
Question 9
Which substance is the oxidizing agent in this redox reaction?
Br−(aq) + MnO4−(aq) → Br2(l) + Mn2+(aq)
Br −
MnO4−
Br2
Mn2+
None of these
Question 10
Which substance is reduced in this redox equation?
HF + Cl2 → F2 + HCl
HF
Cl2
F
HCl
None of these
Question 11
Which substance is the reducing agent in this redox equation?
HF + Cl2 → F2 + HCl
HF
Cl2
F
HCl
None of these
Question 12
Which of these pairs is correctly matched?
Oxidation = the loss of oxygen
Reduction = the reducing agent
Oxidation = the loss of electrons
Oxidation = the gain of hydrogen
Reduction = the loss of hydrogen
Question 13
Which of these substances is the most common oxidizing agent?
CO
H3O+
O2
H2
C
Question 14
Which of these is not an application of oxidizing agents?
Disinfectants
Antiseptics
Household bleaches
Water treatment
Metal processing
Question 15
Which of these substances is the most common reducing agent?
H2
H3O+
O2
H2O
CO
Question 16
During respiration, glucose molecules are _____ in the presence of oxygen to produce carbon dioxide and water.
dissolved
formed
reduced
oxidized
recycled
Question 17
Which of these pairs represents the reactants in photosynthesis?
Oxygen and carbon dioxide
Carbon dioxide and sugars
Water and carbon dioxide
Oxygen and water
Water and sugars
Question 18
During photosynthesis _____is _____to form glucose and oxygen.
carbon; oxidized
carbon; reduced
water; reduced
hydrogen; oxidized
oxygen; reduced
Question 19
Which of these is correctly associated with the cathode?
I.Electrode with a positive chargeII.Electrode at which a substance loses electronsIII.Electrode at which reduction occurs
I only
II only
I and II
I and III
I, II, and III
Question 20
Which of these is correctly associated with the anode?
I.Electrode with negative chargesII.Electrode at which a substance loses electronsIII.Electrode at which reduction occurs
I only
II only
I and II
I and III
I, II, and III
Question 21
Which of the following statements about the lead-acid battery is incorrect?
Pb + PbO2 + 4H+ + SO42− → 2PbSO4 + 2H2O
Lead is oxidized.
Lead oxide acts as the cathode.
Both the anode and cathode reactions result in the formation of PbSO4.
Lead and lead oxide can be reformed from lead sulfate with the application of an outside electrical current.
Porous lead plates act as the cathode.
Question 22
Which of these methods is/are utilized to help prevent the rusting of iron?
I.Painting ironII.Treating iron with sulfuric acidIII.Coating iron with a metal that is more likely to oxidize
I only
II only
I and III
I, II, and III
III only
Question 23
Coating iron with a more oxidative metal than itself to prevent rusting is known as _____.
scrubbing
galvanizing
proofing
protecting
seal coating
Question 24
A sliced apple will turn brown when exposed to air because _____.
oxygen in the air oxidizes the chemicals present in the apple
oxygen in the air reduces the chemicals present in the apple
nitrogen in the air oxidizes the chemicals present in the apple
nitrogen in the air reduces the chemicals present in the apple
hydrogen in the air reduces the chemicals present in the apple
Question 25
_____ is used as a coating in the galvanization process.
Magnesium
Zinc
Chlorine
Iodine
Carbon
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