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 I General Chemistry 1
Stoichiometry
STEM_GC11S-Ie-(25to30); STEM_GC11PCIf-(31to33);
STEM_GC11CRIf-g-(34to37); STEM_GC11MRIg-h-(38to42)
Multiple-Choice Test
Choose the letter of the correct answer. Write your answer on the space provided
before each number.
___1. Calculate the number of molecules in a spoonful of table sugar
(C12H22O11) having a mass of 10.5g.
A. 6.29 × 1024
B. 1.13 × 1023
C. 1.85 × 1022
D. 3.01 × 1023
___2. Calculate the mass in grams of a sample containing 1.85 × 1034
molecules of water.
A. 3.07 × 1010 g
B. 5.53 × 1011 g
C. 188 g
D. 8.46 × 103 g
___3. Which of the following is NOT an empirical formula?
A. NO2
B. H2N
C. CH
D. C3H6
___4. What is the empirical formula of a compound with the molecular formula
C8H16 and a molecular weight of 112.21 amu?
A. C8H16
B. C2H4
C. CH3
D. CH2

2. Quarter I General Chemistry 1
Stoichiometry
STEM_GC11S-Ie-(25to30); STEM_GC11PCIf-(31to33);
STEM_GC11CRIf-g-(34to37); STEM_GC11MRIg-h-(38to42)
Multiple-Choice Test
___5. Calculate the mass of 0.333 mol CO2. The molar mass of carbon dioxide
is 44.0 g.
A. 120 g
B. 12.5 g
C. 13.3 g
D. 14.7 g
___6. Calculate the percentage by mass of nitrogen in HNO3.
A. 22.2 percent
B. 20.0 percent
C. 25.0 percent
D. 76.2 percent
___7. Three common ways of measuring the amount of something are by count,
by mass, and by
A. temperature.
B. volume.
C. area.
D. density.
___8. The atomic mass of fluorine is 19.0 amu, so the molar mass is
A. 19.0 amu.
B. 19.0 g.
C. 6.02 × 1023 amu.
D. 6.02 × 1023 g.
___10. Calculate the percentage by mass of carbon in cadaverine, C5H14N2, a
compound present in rotting meat.
A. 67.4 percent C
B. 58.8 percent C
C. 51.7 percent C
D. 68.2 percent C

3. Quarter I General Chemistry 1
Stoichiometry
STEM_GC11S-Ie-(25to30); STEM_GC11PCIf-(31to33);
STEM_GC11CRIf-g-(34to37); STEM_GC11MRIg-h-(38to42)
Multiple-Choice Test
___11. Balance the following equation.
Al + Cr2O3 → Al2O3 + Cr
A. 2Al + Cr2O3 → Al2O3 + 2Cr
B. 2Al + Cr2O3 → Al2O3 + Cr
C. 4Al + 2Cr2O3 → 2Al2O3 + 4Cr
D. Al + Cr2O3 → Al2O3 + 2Cr
___12. Identify the correct net ionic equation for the following reaction and the
spectator ion, if there is one.
FeO(s) + 2HClO4(aq) → H2O(l) + Fe(ClO4)2(aq)
A. FeO(s) + 2H+(aq) + 2ClO4
-(aq) → H2O(l) + Fe2+(aq) + 2ClO4
-(aq); no
spectator ion
B. FeO(s) + 2H+(aq) + 2ClO4
-(aq) → H2O(l) + Fe2+(aq) + 2ClO4
-(aq); ClO4- is a
spectator ion.
C. FeO(s) + 2H+(aq) → H2O(l) + Fe2+(aq); ClO4
- is a spectator ion.
D. FeO(s) + 2HClO4(aq) → H2O(l) + Fe(ClO4)2(aq); no spectator ion
___13. Balance the following equation and indicate whether it represents a
combustion, combination, or decomposition reaction.
H2SO4 → H2O2 + SO2
A. H2SO4 → H2O2 + SO2, combination reaction
B. H2SO4 → H2O2 + SO2, decomposition reaction
C. H2SO4 → 2H2O2 + SO2, combination reaction
D. H2SO4 → 2H2O2 + SO2, decomposition reaction
___14. What coefficient is needed for HCl when the following equation is
correctly balanced?
CaCO3(s) + HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)
A. 1
B. 2
C. 3
D. 4

4. Quarter I General Chemistry 1
Stoichiometry
STEM_GC11S-Ie-(25to30); STEM_GC11PCIf-(31to33);
STEM_GC11CRIf-g-(34to37); STEM_GC11MRIg-h-(38to42)
Multiple-Choice Test
___15. What is(are) the spectator ion(s) when a BaCl2 solution is combined with
an H2SO4 solution?
A. Ba2+(aq), H+(aq)
B. SO4
2-(aq), H+(aq)
C. Cl-(aq)
D. Cl-(aq), H+(aq)
___16. Which of the following is a skeleton equation?
A. H2 + CO → CH3OH
B. 2H2 + CO → CH3OH
C. 2H2 + CO2 → CH3OH
D. hydrogen + carbon monoxide → methanol
___17. Choose the correct net ionic equation for the reaction that occurs when
the following compounds are mixed: AgNO3(aq) and Na2CO3(aq).
A. 2AgNO3(aq) + Na2CO2(aq) → Ag2CO3(s) + 2NaNO3(aq)
B. 2Na+(aq) + 2NO3(aq) → 2NaNO3(s)
C. 2Ag+(aq) + CO32-(aq) → Ag2CO3(s)
D. 2Na+(aq) + 2Ag+(aq) + 2NO3
-(aq) + CO3
2-(aq) → Ag2CO3(s) + 2NaNO3(s)
___18. Which one of the following substances should be soluble in water?
A. AgCl
B. PbSO4
C. Mg(OH)2
D. Mo(NO3)2
___19. Choose the correct equation for the reaction of hydrobromic acid with
zinc.
A. Zn(s) + HBr(aq) → ZnBr(aq) + H+(aq)
B. Zn(s) + HCl(aq) → ZnCl2(aq) + H2(g)
C. Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
D. Zn(s) + 2HBr(aq) → ZnBr(aq) + H2(g)

5. Quarter I General Chemistry 1
Stoichiometry
STEM_GC11S-Ie-(25to30); STEM_GC11PCIf-(31to33);
STEM_GC11CRIf-g-(34to37); STEM_GC11MRIg-h-(38to42)
Multiple-Choice Test
___20. What is the net ionic equation for the reaction between aqueous Sr(OH)2
and FeSO4 solutions?
A. Sr2+(aq) + SO4
2-(aq) → SrSO4(s).
B. Fe2+(aq) + 2OH-(aq) → Fe(OH)2(s).
C. Fe2+(aq) + SO4
2-(aq) → FeSO4(s).
D. Sr2+(aq) + SO4
2-(aq) + Fe2+(aq) + 2OH(aq) → SrSO4(s) + Fe(OH)2(s).
___21. The alcohol in gasohol burns according to the following equation.
C2H5OH + 3O2 → 2CO2 + 3H2O.
How many moles of CO2 are produced when 3.00 mol of C2H5OH are burned
in this way?
A. 3.00 mol
B. 6.00 mol
C. 2.00 mol
D. 4.00 mol
___22. Automotive airbags inflate when sodium azide, NaN3, rapidly
decomposes to its component elements via this reaction.
2NaN3 → 2Na + 3N2
How many grams of sodium azide are required to form 5.00 g of nitrogen
gas?
A. 9.11 g
B. 8.81 g
C. 7.74 g
D. 3.33 g
___23. Choose the correct values for the spaces. 27.0 g H2O are formed from
24.0 g O2 and __________ g H2. The same 24.0 g O2 could form __________
grams of H2O2 if there were sufficient H2.
A. 3.0, 28.0
B. 3.0, 25.5
C. 6.0, 28.0
D. 48.0, 25.5

6. Quarter I General Chemistry 1
Stoichiometry
STEM_GC11S-Ie-(25to30); STEM_GC11PCIf-(31to33);
STEM_GC11CRIf-g-(34to37); STEM_GC11MRIg-h-(38to42)
Multiple-Choice Test
___24. If 3.00 mol of gaseous SO2 react with oxygen to produce sulfur trioxide,
how many moles of oxygen are needed?
A. 3.00 mol O2
B. 6.00 mol O2
C. 1.50 mol O2
D. 4.00 mol O2
___25. How many grams of iron oxide, Fe2O3, can be produced from 2.50 g of
oxygen reacting with solid iron, according to the following equation?
2Fe(s) + 3O2(g) → Fe2O3(s)
A. 12.5 g
B. 8.32 g
C. 2.50 g
D. 11.2 g
___26. Octane burns according to the following equation.
2C8H18 + 25O2 → 16CO2 + 18H2O
What is the percent yield if 14.6 g of CO2 are produced when 5.00 g of C8H18
are burned?
A. 106%
B. 94.8%
C. 34.2%
D. 62.5%
___27. Silicon carbide, SiC, is commonly known as carborundum. This hard
substance, which is used commercially as an abrasive, is made by heating
SiO2 and C to high temperatures.
SiO2(s) + 3C(s) → SiC(s) + 2CO(g)
How many grams of SiC form when 3.00 g of SiO2 and 4.50 g of C are
allowed to react?
A. 2.00 g
B. 3.00 g
C. 5.01 g
D. 15.0 g

7. Quarter I General Chemistry 1
Stoichiometry
STEM_GC11S-Ie-(25to30); STEM_GC11PCIf-(31to33);
STEM_GC11CRIf-g-(34to37); STEM_GC11MRIg-h-(38to42)
Multiple-Choice Test
___28. The total mass of all reactants in a chemical reaction
A. cannot be determined.
B. equals the mass of the products.
C. is less than the products.
D. is more than the products.
___29. How many moles of water are produced when 2.5 mol of O2 react
according to the following equation?
C3H8 + 5O2 → 3CO2 + 4H2O
A. 4.0
B. 3.0
C. 2.5
D. 2.0
___30. A reaction that produces iron metal from iron ore is shown below.
Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)
How many moles of iron are produced from the reaction of 10 mol Fe2O3 and
25 mol of CO?
A. 10 mol
B. 17 mol
C. 25 mol
D. 35 mol

8. QuarterIGeneralChemistry1
Stoichiometry
STEM_GC11S-Ie-(25to30);STEM_GC11PCIf-(31to33);
STEM_GC11CRIf-g-(34to37);STEM_GC11MRIg-h-(38to42)
Multiple-ChoiceTest
CORRECTANSWERS:
1.Calculatethenumberofmoleculesinaspoonfuloftablesugar(C12H22O11)
havingamassof10.5g.
CORRECT:1.85×1022
2.Calculatethemassingramsofasamplecontaining1.85×1034molecules
ofwater.
CORRECT:5.53×1011g
3.WhichofthefollowingisNOTanempiricalformula?
CORRECT:C3H6
4.Whatistheempiricalformulaofacompoundwiththemolecularformula
C8H16andamolecularweightof112.21amu?
CORRECT:CH2
5.Calculatethemassof0.333molCO2.Themolarmassofcarbondioxideis
44.0g.
CORRECT:14.7g
6.CalculatethepercentagebymassofnitrogeninHNO3.
CORRECT:22.2percent
7.Threecommonwaysofmeasuringtheamountofsomethingarebycount,by
mass,andby
CORRECT:volume.
8.Theatomicmassoffluorineis19.0amu,sothemolarmassis
CORRECT:19.0g.
10.Calculatethepercentagebymassofcarbonincadaverine,C5H14N2,a
compoundpresentinrottingmeat.
CORRECT:58.8percentC
11.Balancethefollowingequation.Al+Cr2O3→Al2O3+Cr
CORRECT:2Al+Cr2O3→Al2O3+2Cr

9. QuarterIGeneralChemistry1
Stoichiometry
STEM_GC11S-Ie-(25to30);STEM_GC11PCIf-(31to33);
STEM_GC11CRIf-g-(34to37);STEM_GC11MRIg-h-(38to42)
Multiple-ChoiceTest
12.Identifythecorrectnetionicequationforthefollowingreactionandthe
spectatorion,ifthereisone.FeO(s)+2HClO4(aq)→H2O(l)+Fe(ClO4)2(aq)
CORRECT:FeO(s)+2H+(aq)→H2O(l)+Fe2+(aq);ClO4
-isaspectatorion.
13.Balancethefollowingequationandindicatewhetheritrepresentsa
combustion,combination,ordecompositionreaction.
H2SO4→H2O2+SO2
CORRECT:H2SO4→H2O2+SO2,decompositionreaction
14.WhatcoefficientisneededforHClwhenthefollowingequationiscorrectly
balanced?CaCO3(s)+HCl(aq)→CaCl2(aq)+CO2(g)+H2O(l)
CORRECT:2
15.Whatis(are)thespectatorion(s)whenaBaCl2solutioniscombinedwithan
H2SO4solution?
CORRECT:Cl-(aq),H+(aq)
16.Whichofthefollowingisaskeletonequation?
CORRECT:H2+CO→CH3OH
17.Choosethecorrectnetionicequationforthereactionthatoccurswhenthe
followingcompoundsaremixed:AgNO3(aq)andNa2CO3(aq).
CORRECT:2Ag+(aq)+CO3
2(aq)→Ag2CO3(s)
18.Whichoneofthefollowingsubstancesshouldbesolubleinwater?
CORRECT:Mo(NO3)2
19.Choosethecorrectequationforthereactionofhydrobromicacidwithzinc.
CORRECT:Zn(s)+2HBr(aq)→ZnBr(aq)+H2(g)
20.WhatisthenetionicequationforthereactionbetweenaqueousSr(OH)2
andFeSO4solutions?
CORRECT:
Sr2+(aq)+SO4
2-(aq)+Fe2+(aq)+2OH(aq)→SrSO4(s)+Fe(OH)2(s).
21.Thealcoholingasoholburnsaccordingtothefollowingequation.
C2H5OH+3O2→2CO2+3H2O.HowmanymolesofCO2areproducedwhen
3.00molofC2H5OHareburnedinthisway?
CORRECT:6.00mol

10. QuarterIGeneralChemistry1
Stoichiometry
STEM_GC11S-Ie-(25to30);STEM_GC11PCIf-(31to33);
STEM_GC11CRIf-g-(34to37);STEM_GC11MRIg-h-(38to42)
Multiple-ChoiceTest
22.Automotiveairbagsinflatewhensodiumazide,NaN3,rapidlydecomposes
toitscomponentelementsviathisreaction.2NaN3→2Na+3N2
Howmanygramsofsodiumazidearerequiredtoform5.00gofnitrogen
gas?
CORRECT:7.74g
23.Choosethecorrectvaluesforthespaces.27.0gH2Oareformedfrom24.0
gO2and__________gH2.Thesame24.0gO2couldform__________grams
ofH2O2ifthereweresufficientH2.
CORRECT:3.0,25.5
24.If3.00molofgaseousSO2reactwithoxygentoproducesulfurtrioxide,
howmanymolesofoxygenareneeded?
CORRECT:1.50molO2
25.Howmanygramsofironoxide,Fe2O3,canbeproducedfrom2.50gof
oxygenreactingwithsolidiron,accordingtothefollowingequation?
2Fe(s)+3O2(g)→Fe2O3(s)
CORRECT:8.32g
26.Octaneburnsaccordingtothefollowingequation.
2C8H18+25O2→16CO2+18H2O
Whatisthepercentyieldif14.6gofCO2areproducedwhen5.00gofC8H18
areburned?
CORRECT:94.8%
27.Siliconcarbide,SiC,iscommonlyknownascarborundum.Thishard
substance,whichisusedcommerciallyasanabrasive,ismadebyheating
SiO2andCtohightemperatures.SiO2(s)+3C(s)→SiC(s)+2CO(g)
HowmanygramsofSiCformwhen3.00gofSiO2and4.50gofCare
allowedtoreact?
CORRECT:2.00g
28.Thetotalmassofallreactantsinachemicalreaction
CORRECT:equalsthemassoftheproducts.
29.Howmanymolesofwaterareproducedwhen2.5molofO2reactaccording
tothefollowingequation?C3H8+5O2→3CO2+4H2O
CORRECT:2.0

11. QuarterIGeneralChemistry1
Stoichiometry
STEM_GC11S-Ie-(25to30);STEM_GC11PCIf-(31to33);
STEM_GC11CRIf-g-(34to37);STEM_GC11MRIg-h-(38to42)
Multiple-ChoiceTest
30.Areactionthatproducesironmetalfromironoreisshownbelow.
Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)
Howmanymolesofironareproducedfromthereactionof10molFe2O3and
25molofCO?
CORRECT:17mol