Chemistry homework

Anonymous
timer Asked: Nov 28th, 2018
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Question description

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

Tutor Answer

Robertmariasi
School: UT Austin

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Anonymous
Outstanding Job!!!!

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