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
Atoms, Molecules, and Ions
STEM_GC11AMIc-e-(15to24)
Multiple-Choice Test
Choose the letter of the correct answer. Write your answer on the space provided
before each number.
___1. The relative charges of an electron, neutron, and proton are, respectively,
A. −1, +1, and 0.
B. +1, 0, and −1.
C. −1, 0, and +1.
D. 0, −1, and +1.
___2. Dalton's atomic theory was an improvement over the ideas of Democritus
because it
A. did not explain the chemical behavior of atoms.
B. explained how subatomic particles were distributed in an atom.
C. explained why atoms are electrically neutral.
D. was based on experimental evidence.
___3. Individual atoms are observable with
A. the naked eye.
B. a magnifying glass.
C. a light microscope.
D. a scanning tunneling microscope.
___4. Which of the following is NOT an example of a subatomic particle?
A. protons.
B. molecules.
C. electrons.
D. neutrons.
___5. Which of the following ideas is NOT part of Dalton's atomic theory?
A. All elements are composed of tiny particles called atoms.
B. Atoms of the same element are identical.
C. In chemical reactions, atoms of one element are changed into atoms of
another element.
D. Atoms of different elements can physically mix together or chemically
combine.

2. Quarter I General Chemistry 1
Atoms, Molecules, and Ions
STEM_GC11AMIc-e-(15to24)
Multiple-Choice Test
___6. Which of the following statements about subatomic particles is correct?
A. The subatomic particle with the greatest mass is the electron.
B. A proton has a mass nearly equal to that of a neutron.
C. Protons, neutrons, and electrons have the same mass.
D. The subatomic particle with the least mass is the proton.
___7. The element X has three isotopes: X-221, X-220, and X-218, with masses
220.9, 220.0, and 1 amu. The relative abundances of these three isotopes
are 74.22%, 12.78%, and 13.00%, respectively. Calculate the atomic mass
of element X.
A. 219.7 amu
B. 220.5 amu
C. 220.42 amu
D. 220.4 amu
___8. Which one of the following is a pair of isotopes of the same element?
A. 116 119
92 92X, X
B. 116 122
92 89X, X
C. 96 116
45 92X, X
D. 233 116
99 92X, X
___9. How many neutrons are there in the nucleus of a Th-232 atom?
A. 232
B. 142
C. 90
D. 151
___10. Naturally occurring bromine consists of two isotopes: 79
35Br and 81
35Br .
How many neutrons are in each isotope?
A. 35, 35
B. 35, 37
C. 44, 46
D. 45, 47

3. Quarter I General Chemistry 1
Atoms, Molecules, and Ions
STEM_GC11AMIc-e-(15to24)
Multiple-Choice Test
___11. The name of the base Ba(OH)2 is
A. barium dihydroxide.
B. barium dioxyhydride.
C. barium hydroxide.
D. barium hydroxite.
___12. The law of definite proportions states that in samples of any chemical
compound, the elements are always in the same proportion by
A. volume.
B. ratio.
C. number.
D. mass.
___13. Which of the following molecular compounds is named incorrectly?
A. SbCl3, antimony trichloride
B. C2O5, dicarbon pentoxide
C. CF4, carbon tetrafluoride
D. H3As, hydrogen arsenide
___14. What is the correct formula for strontium nitride?
A. Sr3N2
B. SrN2
C. Sr2N3
D. Sr3N
___15. The correct chemical name for NH4OH is
A. nitrogen tetrahydrogen hydroxide.
B. nitrogen pentahydrogen oxide.
C. ammonium oxyhydride.
D. ammonium hydroxide.

4. Quarter I General Chemistry 1
Atoms, Molecules, and Ions
STEM_GC11AMIc-e-(15to24)
Multiple-Choice Test
___16. The correct formula for tetraphosphorus trisulfide is
A. P3S4
B. S3P4
C. P4S3
D. S4P3
___17. Which one of the following compounds is named correctly?
A. calcium sulfide, Ca(HS)2
B. ammonia, NH4
+
C. aluminum nitride, AlN
D. iron(III) oxide, FeO
___19. The chemical formula for chlorous acid is
A. HClO2.
B. HClO3.
C. HClO4.
D. HCl.
___20. What is the formula of the ionic compound formed from Ca2+ and PO4
3−?
CaPO4
Ca3(PO4)2
Ca2(PO4)3
Ca(PO4)2

5. QuarterIGeneralChemistry1
Atoms,Molecules,andIons
STEM_GC11AMIc-e-(15to24)
Multiple-ChoiceTest
CORRECTANSWERS:
1.Therelativechargesofanelectron,neutron,andprotonare,respectively,
CORRECT:−1,0,and+1.
2.Dalton'satomictheorywasanimprovementovertheideasofDemocritus
becauseit
CORRECT:wasbasedonexperimentalevidence.
3.Individualatomsareobservablewith
CORRECT:ascanningtunnelingmicroscope.
4.WhichofthefollowingisNOTanexampleofasubatomicparticle?
CORRECT:molecules.
5.WhichofthefollowingideasisNOTpartofDalton'satomictheory?
CORRECT:Inchemicalreactions,atomsofoneelementarechangedinto
atomsofanotherelement.
6.Whichofthefollowingstatementsaboutsubatomicparticlesiscorrect?
CORRECT:Aprotonhasamassnearlyequaltothatofaneutron.
7.TheelementXhasthreeisotopes:X-221,X-220,andX-218,withmasses
220.9,220.0,and218.1amu.Therelativeabundancesofthesethree
isotopesare74.22%,12.78%,and13.00%,respectively.Calculatethe
atomicmassofelementX.
CORRECT:220.4amu
8.Whichoneofthefollowingisapairofisotopesofthesameelement?
CORRECT:116119
9292 X,X
9.HowmanyneutronsarethereinthenucleusofaTh-232atom?
CORRECT:142
10.Naturallyoccurringbromineconsistsoftwoisotopes:79
35Brand81
35Br.How
manyneutronsareineachisotope?
CORRECT:44,46
11.ThenameofthebaseBa(OH)2is
CORRECT:bariumhydroxide.
12.Thelawofdefiniteproportionsstatesthatinsamplesofanychemical
compound,theelementsarealwaysinthesameproportionby
CORRECT:mass.
13.Whichofthefollowingmolecularcompoundsisnamedincorrectly?
CORRECT:H3As,hydrogenarsenide
14.Whatisthecorrectformulaforstrontiumnitride?
CORRECT:Sr3N2
15.ThecorrectchemicalnameforNH4OHis
CORRECT:ammoniumhydroxide.

6. QuarterIGeneralChemistry1
Atoms,Molecules,andIons
STEM_GC11AMIc-e-(15to24)
Multiple-ChoiceTest
16.Thecorrectformulafortetraphosphorustrisulfideis
CORRECT:P4S3
17.Whichoneofthefollowingcompoundsisnamedcorrectly?
CORRECT:aluminumnitride,AlN
19.Thechemicalformulaforchlorousacidis
CORRECT:HClO2.
20.WhatistheformulaoftheioniccompoundformedfromCa2+andPO4
3−?
CORRECT:Ca3(PO4)2