1. According sto sthe slaw sof sdefinite sproportions,
a. the sratio sof sthe smasses sof sthe selements sin sa scompound sis salways sthe ssame.
b. it sis snot spossible sfor sthe ssame stwo selements sto sform smore sthan sone scompound.
c. if sthe ssame stwo selements sform stwo sdifferent scompounds, sthey sdo sso sin sthe ssame sratio.
d. the stotal smass safter sa schemical schange sis sthe ssame sas sbefore sthe schange.
ANSWER: a
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.2
KEYWORDS: compound s| sgeneral schemistry s| sgeneral sconcepts s| smatter
2. Which sof sthe sfollowing spairs sof scompounds scan sbe sused sto sillustrate sthe slaw sof smultiple sproportions?
a. CaO sand sCaCl2
b. NO sand sNO2
c. H2S sand sHBr
d. SiH4 s and sSiO2
e. NF3 s and sNCl3
ANSWER: b
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.2
KEYWORDS: compound s| sgeneral schemistry s| sgeneral sconcepts s| smatter
3. How smany sof sthe sfollowing sdid sDalton snot sdiscuss sin shis satomic stheory?
I. isotopes
II. ions
III. protons
IV. neutrons
V. electrons
a. s 2
b. s5
c. s 4
d. s1
e. s 3
ANSWER: b
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.3
KEYWORDS: atomic stheory sof smatter s| sDalton's satomic stheory s| searly satomic stheory s| sgeneral schemistry
4. When s2.0 sL sof soxygen sgas s(O2) sreacts swith s1.0 sL sof snitrogen sgas s(N2), s2.0 sL sof sgaseous sproduct sis sformed.
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, All svolumes sof sgases sare smeasured sat sthe ssame stemperature sand spressure. sWhat sis sthe sformula sof sthe sproduct?
a. NO
b. NO4
c. N2O3
d. N2O
e. NO2
ANSWER: e
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.4
KEYWORDS: chemical sformula s| schemical ssubstance s| searly satomic stheory s| sgeneral schemistry s|
smolecular ssubstance
5. Which sone sof sthe sfollowing sstatements sabout satomic sstructure sis sfalse?
a. Almost sall sof sthe smass sof sthe satom sis sconcentrated sin sthe snucleus.
b. The sprotons sand sneutrons sin sthe snucleus sare svery stightly spacked.
c. The snumber sof sprotons sand sthe snumber sof sneutrons sare salways sthe ssame sin sthe sneutral satom.
d. The selectrons soccupy sa svery slarge svolume scompared sto sthe snucleus.
ANSWER: c
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.4
2.5
KEYWORDS: atomic stheory sof smatter s| searly satomic stheory s| sgeneral schemistry s| snuclear sstructure
6. Which sof sthe sexperiments slisted sbelow sdid snot sprovide sthe sinformation sstated sabout sthe snature sof sthe satom?
a. The sRutherford sexperiment sproved sthat sthe sThomson s"plum spudding" smodel sof sthe satom
swas sessentially scorrect.
b. The sRutherford sexperiment sdetermined sthe scharge son sthe snucleus.
c. The scathode-ray stube sproved sthat selectrons shave sa snegative scharge.
d. Millikan's soil-drop sexperiment sshowed sthat sthe scharge son sany sparticle swas sa ssimple smultiple sof
sthe scharge son sthe selectron.
ANSWER: a
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.5
KEYWORDS: atomic stheory sof smatter s| searly satomic stheory s| sgeneral schemistry s| sstructure sof sthe satom
7. Which sof sthe sfollowing satomic ssymbols sis sincorrect?
a. 3115P
b. 199F
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, c. 34
17Cl
d. 39
19K
e. 15
8C
ANSWER: e
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.5
KEYWORDS: atomic stheory sof smatter s| searly satomic stheory s| sgeneral schemistry s| sisotope
8. The selement srhenium s(Re) sexists sas stwo sstable sisotopes sand s18 sunstable sisotopes. sRhenium-185 shas sin
sits snucleus
a. 75 sprotons, s110 sneutrons.
b. 75 sprotons, s75 sneutrons.
c. 75 sprotons, s130 sneutrons.
d. 130 sprotons, s75 sneutrons.
e. not senough sinformation sis sgiven.
ANSWER: a
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.5
KEYWORDS: atomic stheory sof smatter s| searly satomic stheory s| sgeneral schemistry s| sisotope
9. Which sof sthe sfollowing sstatements sis(are) strue?
I. O sand sF shave sthe ssame snumber sof sneutrons.
C sand sN sare sisotopes sof seach sother sbecause stheir smass snumbers
II. sare sthe ssame.
III. O2– s has sthe ssame snumber sof selectrons sas sNe.
a. I sonly
b. II sonly
c. III sonly
d. I sand sII sonly
e. I sand sIII sonly
ANSWER: c
POINTS: 1
DIFFICULTY: s moderate
TOPICS: 2.5
KEYWORDS: atomic stheory sof smatter s| searly satomic stheory s| sgeneral schemistry s| sisotope
10. Which samong sthe sfollowing srepresent sa sset sof sisotopes? sAtomic snuclei scontaining
I. 20 sprotons sand s20 sneutrons.
II. 21 sprotons sand s19 sneutrons.
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a. the sratio sof sthe smasses sof sthe selements sin sa scompound sis salways sthe ssame.
b. it sis snot spossible sfor sthe ssame stwo selements sto sform smore sthan sone scompound.
c. if sthe ssame stwo selements sform stwo sdifferent scompounds, sthey sdo sso sin sthe ssame sratio.
d. the stotal smass safter sa schemical schange sis sthe ssame sas sbefore sthe schange.
ANSWER: a
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.2
KEYWORDS: compound s| sgeneral schemistry s| sgeneral sconcepts s| smatter
2. Which sof sthe sfollowing spairs sof scompounds scan sbe sused sto sillustrate sthe slaw sof smultiple sproportions?
a. CaO sand sCaCl2
b. NO sand sNO2
c. H2S sand sHBr
d. SiH4 s and sSiO2
e. NF3 s and sNCl3
ANSWER: b
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.2
KEYWORDS: compound s| sgeneral schemistry s| sgeneral sconcepts s| smatter
3. How smany sof sthe sfollowing sdid sDalton snot sdiscuss sin shis satomic stheory?
I. isotopes
II. ions
III. protons
IV. neutrons
V. electrons
a. s 2
b. s5
c. s 4
d. s1
e. s 3
ANSWER: b
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.3
KEYWORDS: atomic stheory sof smatter s| sDalton's satomic stheory s| searly satomic stheory s| sgeneral schemistry
4. When s2.0 sL sof soxygen sgas s(O2) sreacts swith s1.0 sL sof snitrogen sgas s(N2), s2.0 sL sof sgaseous sproduct sis sformed.
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, All svolumes sof sgases sare smeasured sat sthe ssame stemperature sand spressure. sWhat sis sthe sformula sof sthe sproduct?
a. NO
b. NO4
c. N2O3
d. N2O
e. NO2
ANSWER: e
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.4
KEYWORDS: chemical sformula s| schemical ssubstance s| searly satomic stheory s| sgeneral schemistry s|
smolecular ssubstance
5. Which sone sof sthe sfollowing sstatements sabout satomic sstructure sis sfalse?
a. Almost sall sof sthe smass sof sthe satom sis sconcentrated sin sthe snucleus.
b. The sprotons sand sneutrons sin sthe snucleus sare svery stightly spacked.
c. The snumber sof sprotons sand sthe snumber sof sneutrons sare salways sthe ssame sin sthe sneutral satom.
d. The selectrons soccupy sa svery slarge svolume scompared sto sthe snucleus.
ANSWER: c
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.4
2.5
KEYWORDS: atomic stheory sof smatter s| searly satomic stheory s| sgeneral schemistry s| snuclear sstructure
6. Which sof sthe sexperiments slisted sbelow sdid snot sprovide sthe sinformation sstated sabout sthe snature sof sthe satom?
a. The sRutherford sexperiment sproved sthat sthe sThomson s"plum spudding" smodel sof sthe satom
swas sessentially scorrect.
b. The sRutherford sexperiment sdetermined sthe scharge son sthe snucleus.
c. The scathode-ray stube sproved sthat selectrons shave sa snegative scharge.
d. Millikan's soil-drop sexperiment sshowed sthat sthe scharge son sany sparticle swas sa ssimple smultiple sof
sthe scharge son sthe selectron.
ANSWER: a
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.5
KEYWORDS: atomic stheory sof smatter s| searly satomic stheory s| sgeneral schemistry s| sstructure sof sthe satom
7. Which sof sthe sfollowing satomic ssymbols sis sincorrect?
a. 3115P
b. 199F
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, c. 34
17Cl
d. 39
19K
e. 15
8C
ANSWER: e
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.5
KEYWORDS: atomic stheory sof smatter s| searly satomic stheory s| sgeneral schemistry s| sisotope
8. The selement srhenium s(Re) sexists sas stwo sstable sisotopes sand s18 sunstable sisotopes. sRhenium-185 shas sin
sits snucleus
a. 75 sprotons, s110 sneutrons.
b. 75 sprotons, s75 sneutrons.
c. 75 sprotons, s130 sneutrons.
d. 130 sprotons, s75 sneutrons.
e. not senough sinformation sis sgiven.
ANSWER: a
POINTS: 1
DIFFICULTY: s easy
TOPICS: 2.5
KEYWORDS: atomic stheory sof smatter s| searly satomic stheory s| sgeneral schemistry s| sisotope
9. Which sof sthe sfollowing sstatements sis(are) strue?
I. O sand sF shave sthe ssame snumber sof sneutrons.
C sand sN sare sisotopes sof seach sother sbecause stheir smass snumbers
II. sare sthe ssame.
III. O2– s has sthe ssame snumber sof selectrons sas sNe.
a. I sonly
b. II sonly
c. III sonly
d. I sand sII sonly
e. I sand sIII sonly
ANSWER: c
POINTS: 1
DIFFICULTY: s moderate
TOPICS: 2.5
KEYWORDS: atomic stheory sof smatter s| searly satomic stheory s| sgeneral schemistry s| sisotope
10. Which samong sthe sfollowing srepresent sa sset sof sisotopes? sAtomic snuclei scontaining
I. 20 sprotons sand s20 sneutrons.
II. 21 sprotons sand s19 sneutrons.
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