https://www.deped.gov.ph/wp-content/uploads/2019/01/General-Chemistry-1-and-2.pdf General Chemistry GenChem STEM Science, Technology, Engineering, and Mathematics K to 12 Senior High School STEM Specialized Subject – General Chemistry 1 and 2 Quarter 1 – General Chemistry 1 Matter and Its Properties Measurements Atoms, Molecules and Ions Stoichiometry Percent Composition and Chemical Formulas Chemical reactions and chemical equations Mass Relationships in Chemical Reactions Gases Dalton’s Law of partial pressures Gas stoichiometry Kinetic molecular theory of gases Quarter 2 – General Chemistry 1 Electronic Structure of Atoms Electronic Structure and Periodicity Chemical Bonding Organic compounds Quarter 3 – General Chemistry 2 Intermolecular Forces and Liquids and Solids Physical Properties of Solutions Thermochemistry Chemical Kinetics Quarter 4 – General Chemistry 2 Chemical Thermodynamics Chemical Equilibrium Acid-Base Equilibria and Salt Equilibria Electrochemistry

1. Quarter IV General Chemistry 2
Electrochemistry
STEM_GC11ABIVf-g-(169to185)
Multiple-Choice Test
Choose the letter of the correct answer. Write your answer on the space provided
before each number.
___1. Which of the following oxidation numbers is incorrect?
A. ClO3
−; Cl +5, O −2
B. SO3
2−; S +4, O −2
C. H2O2; H +1, O −1
D. Ca(ClO)2; Ca +2, Cl +2, O −2
___2. Breathalyzers use a redox reaction to determine alcohol content:
Cr2O7
2− + C2H5OH → Cr3+ + C2H4O2.
Identify the reducing agent and the oxidizing agent.
A. C2H5OH, reducing agent; Cr3+, oxidizing agent
B. C2H5OH, oxidizing agent; Cr2O7
2−, reducing agent
C. C2H5OH, reducing agent; Cr2O7
2−, oxidizing agent
D. C2H5OH, reducing agent; C2H4O2, oxidizing agent
___3. Which reaction is likely to be a redox reaction?
I. acid-base reaction
II. metal reacting with oxygen
III. combustion reaction
A. (I) and (II)
B. (I) and (III)
C. (II) and (III)
D. (I), (II), and (III)
___4. A double-replacement reaction is NOT a redox reaction because
A. oxygen is not involved.
B. the reactants are in aqueous solution.
C. there is no change in oxidation numbers.
D. an element is not a product.

2. Quarter IV General Chemistry 2
Electrochemistry
STEM_GC11ABIVf-g-(169to185)
Multiple-Choice Test
___5. The element that donates electrons in a redox reaction is called the
reducing agent. This means the reducing agent is always
A. the more active element.
B. the less active element.
C. oxidized.
D. reduced.
___6. What is the oxidation number of Co in CoCl6
3−?
A. −3
B. −6
C. +8
D. +3
___7. When the following unbalanced equation is separated into half-reactions,
the reduction half-reaction will show a __________ of __________ electrons.
Al(s) + Cl2(aq) → Al3+(aq) + Cl−(aq)
A. gain, two
B. gain, three
C. loss, three
D. loss, two
___8. Which statement is incorrect?
A. Reduction may involve the loss of oxygen atoms.
B. Reduction is a gain of electrons.
C. Reduction is an increase in positive charge.
D. Reduction is always accompanied by oxidation.
___9. Identify the oxidizing agent in the following reaction.
2NaOH(aq) + 6H2O(l) + 2Al(s) → 2NaAl(OH)4(aq) + 3H2(g)
A. sodium hydroxide
B. aluminum
C. hydrogen
D. water

3. Quarter IV General Chemistry 2
Electrochemistry
STEM_GC11ABIVf-g-(169to185)
Multiple-Choice Test
___10. What are the coefficients that balance this redox reaction?
AsH3(g) + NaClO3(aq) → H3AsO4(aq) + NaCl(aq)
A. 4, 3, 4, 3
B. 3, 4, 3, 4
C. 2, 3, 2, 3
D. 3, 2, 3, 2
___11. A voltaic cell consisting of an yttrium electrode in a solution of 1M
Y2(SO4)3 and a copper electrode in 1M CuSO4 has a standard potential of
+2.71 V, and the Y electrode is the anode. If E0 for Cu2+/Cu = +0.337 V,
calculate the potential in volts for the following reaction:
Y3+(aq) + 3e− → Y(s).
A. +3.05
B. −2.71
C. +2.37
D. −2.37
___12. If the cell potential for a given redox reaction is __________, then the
reaction is spontaneous as written. If the cell potential is __________, then
the reaction is nonspontaneous.
A. negative, positive
B. positive, negative
C. zero, positive
D. negative, zero
___13. In a voltaic cell, the electrode called the __________ is the one at which at
which reduction occurs, and the electrode called the __________ is the one at
which oxidation occurs.
A. anode, cathode
B. cathode, anode
C. anode, terminal
D. post, cathode

4. Quarter IV General Chemistry 2
Electrochemistry
STEM_GC11ABIVf-g-(169to185)
Multiple-Choice Test
___14. The purification of copper is accomplished by the process of
A. electroforming.
B. electrorefining
C. electromachining.
D. electropolishing.
___15. A cell is constructed using these half-reactions.
Fe2+ + 2e− → Fe (E0 = −0.44 V)
Ag+ + e− → Ag (E0 = +0.80 V)
What is the cell potential?
A. +1.24 V
B. +1.16 V
C. −1.24 V
D. +0.36 V
___16. In electrolysis, direct electric current is used to
A. cause a chemical change.
B. produce a battery.
C. generate heat.
D. run a motor.
___17. All half-cell potentials are measured relative to the standard
A. hydrogen electrode.
B. platinum electrode.
C. oxygen electrode.
D. copper electrode.
___18. The electrical potential of a cell results from the competition for
__________ between two half-cells.
A. electrolytes
B. oxygen
C. electrons
D. protons

5. Quarter IV General Chemistry 2
Electrochemistry
STEM_GC11ABIVf-g-(169to185)
Multiple-Choice Test
___19. During the electrolysis of water, the region around the anode
A. changes color.
B. turns basic.
C. turns acidic.
D. remains neutral.
___20. The electrolysis of brine produces __________ at the anode and
__________ at the cathode.
A. Cl2(g), H2(g)
B. H2(g), Cl2(g)
C. NaCl(s), NaOH(aq)
D. H2O(g), Cl2(g)

6. QuarterIVGeneralChemistry2
Electrochemistry
STEM_GC11ABIVf-g-(169to185)
Multiple-ChoiceTest
CORRECTANSWERS:
1.Whichofthefollowingoxidationnumbersisincorrect?
CORRECT:Ca(ClO)2;Ca+2,Cl+2,O−2
2.Breathalyzersusearedoxreactiontodeterminealcoholcontent:
Cr2O7
2−+C2H5OH→Cr3++C2H4O2.
Identifythereducingagentandtheoxidizingagent.
CORRECT:C2H5OH,reducingagent;Cr2O72−,oxidizingagent
3.Whichreactionislikelytobearedoxreaction?
I.acid-basereaction
II.metalreactingwithoxygen
III.combustionreaction
CORRECT:(II)and(III)
4.Adouble-replacementreactionisNOTaredoxreactionbecause
CORRECT:thereisnochangeinoxidationnumbers.
5.Theelementthatdonateselectronsinaredoxreactioniscalledthereducing
agent.Thismeansthereducingagentisalways
CORRECT:oxidized.
6.WhatistheoxidationnumberofCoinCoCl6
3−?
CORRECT:+3
7.Whenthefollowingunbalancedequationisseparatedintohalf-reactions,the
reductionhalf-reactionwillshowa__________of__________electrons.
Al(s)+Cl2(aq)→Al3+(aq)+Cl−(aq)
CORRECT:gain,two
8.Whichstatementisincorrect?
CORRECT:Reductionisanincreaseinpositivecharge.
9.Identifytheoxidizingagentinthefollowingreaction.
2NaOH(aq)+6H2O(l)+2Al(s)→2NaAl(OH)4(aq)+3H2(g)
CORRECT:water

7. QuarterIVGeneralChemistry2
Electrochemistry
STEM_GC11ABIVf-g-(169to185)
Multiple-ChoiceTest
10.Whatarethecoefficientsthatbalancethisredoxreaction?
AsH3(g)+NaClO3(aq)→H3AsO4(aq)+NaCl(aq)
CORRECT:3,4,3,4
11.Avoltaiccellconsistingofanyttriumelectrodeinasolutionof1MY2(SO4)3
andacopperelectrodein1MCuSO4hasastandardpotentialof+2.71V,
andtheYelectrodeistheanode.IfE0forCu2+/Cu=+0.337V,calculatethe
potentialinvoltsforthefollowingreaction:
Y3+(aq)+3e−→Y(s).
CORRECT:−2.37
12.Ifthecellpotentialforagivenredoxreactionis__________,thenthe
reactionisspontaneousaswritten.Ifthecellpotentialis__________,then
thereactionisnonspontaneous.
CORRECT:positive,negative
13.Inavoltaiccell,theelectrodecalledthe__________istheoneatwhichat
whichreductionoccurs,andtheelectrodecalledthe__________istheoneat
whichoxidationoccurs.
CORRECT:cathode,anode
14.Thepurificationofcopperisaccomplishedbytheprocessof
CORRECT:electrorefining
15.Acellisconstructedusingthesehalf-reactions.
Fe2++2e−→Fe(E0=−0.44V)
Ag++e−→Ag(E0=+0.80V)
Whatisthecellpotential?
CORRECT:+1.24V
16.Inelectrolysis,directelectriccurrentisusedto
CORRECT:causeachemicalchange.
17.Allhalf-cellpotentialsaremeasuredrelativetothestandard
CORRECT:hydrogenelectrode.
18.Theelectricalpotentialofacellresultsfromthecompetitionfor__________
betweentwohalfcells.
CORRECT:electrons

8. QuarterIVGeneralChemistry2
Electrochemistry
STEM_GC11ABIVf-g-(169to185)
Multiple-ChoiceTest
19.Duringtheelectrolysisofwater,theregionaroundtheanode
CORRECT:turnsacidic.
20.Theelectrolysisofbrineproduces__________attheanodeand__________at
thecathode.
CORRECT:Cl2(g),H2(g)