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CHEM 101 EXAM 1 PRACTICE QUESTIONS WITH CORRECT ANSWERS.

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CHEM 101 EXAM 1 PRACTICE QUESTIONS WITH CORRECT ANSWERS.

Institution
Chemistry 101
Course
Chemistry 101

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CHEM 101 EXAM 1 PRACTICE QUESTIONS
ee ee ee ee ee




WITH CORRECT ANSWERS
ee ee ee




What eeis eethe eechemical eeformula eefor eeIron eeOxide? eeWhat eeroman eenumeral eeneeds eeto eego eewith eeit?
ee- eeCORRECT eeANSWER ee-Fe2O3



Iron ee(III) eeOxide



What eeis eethe eename eeof eea eecompound eewith eethe eechemical eeformula eeN2O5? ee- eeCORRECT
eeANSWER ee- eeDinitrogen eepentoxide.




Calculate eethe eenew eevolume eewhen eethe eepressure eeon ee5.0L eeof eegas eeat ee1.8 eeatm eeis eeincreased eeto
ee4.5 eeatm. ee-


CORRECT eeANSWER ee-

P1V1=P2V2 ee(1.8)(5)=(4.5)(x)

x ee= ee2

New eevolume eeis ee2 eeL.



90% eeof eethe eeuniverse eetoday eeis eemade eeup eeof eetwo eeelements. eeWhat eeare eethey? ee- eeCORRECT
eeANSWER ee- eeThe eefirst eetwo eeelements eeon eethe eeperiodic eetable.



Hydrogen ee(H) eeand eeHelium ee(He).



Name eethe eehalogens. ee- eeCORRECT eeANSWER ee-
Fluorine ee(F), eeChlorine ee(Cl), eeBromine ee(Br), eeIodine ee(I), eeAstatine ee(At)

ee Funny eeClowns eeBroil eeInnocent eeAnts.



Convert ee8.3 eex10^7 eeinches eeto eemeters.

1 eemeter ee= ee39.4 eeinches ee- eeCORRECT eeANSWER ee-In eecalculator:

(8.3x10^7)/39.4 eeAns: ee2,106,598.98
ee

, Correct eeSig eefigs: ee2,100,000 eeOR ee2.1x10^6

Reminder: eealways eebe eeextra eecareful eeusing eescientific eenotation eein eeyour eecalculator. eeI'd eesuggest
eealways eeusing eeparentheses.




Which eeof eethe eefollowing eeis eea eehomogeneous

mixture? eeSalt eewater
ee



Pure eesulfur

Bubble eetea ee- eeCORRECT eeANSWER ee-salt eewater

a eehomogenous eemixture eeyou eecan eethink eeof eea ee"blended" eemixture eeor eea eedissolved

ee solution. eeA eeheterogenous eemixture eeis eemore eelike eeice eecubes eein eewater, eeor eeboba

ee and eemilk eetea.



What eeis eethe eechemical eeformula eeof eeAluminum eesulfide? ee- eeCORRECT eeANSWER ee-Al2S3



What eeis eethe eecharge eeof eea eebarium eeion? eeBa ee- eeCORRECT eeANSWER ee-Ba^2+



How eemany eeprotons, eeneutrons, eeand eeelectrons eeare eein eea eecalcium

atom? eeHow eemany eein eea eecalcium eeion? ee- eeCORRECT eeANSWER ee-
ee


The eeatomic eenumber eeis ee20. eeCalcium eehas ee20 eeprotons.

The eemass eeis ee40.08, eewhich eeaccounts eefor eethe eenumber eeof eeprotons ee+ eeneutrons. ee#
eeprotons ee- eeatomic eemass ee= ee# eeneutrons



40.08 ee- ee20 ee= ee20 eeneutrons.

20 eeelectrons. eeElectrons eeshould eealways eebe eethe eesame eeamount eeas eethe eeprotons ee(so eethe
eeatomicBnumbe eer). eeUNLESS eeit's eea eecharged eeion.



Ca eeion eehas eea ee2+ eecharge eemeaning eeit eehas eeTWO eeLESS eeelectrons, eemaking eeit eemore eepositive.

In eethis eecase, eethe eenumber eeof eeprotons eeand eeneutrons eedon't eechange, eebut eethe eenumber eeof
eeelectrons eedec eereases eeby eetwo, eeleaving ee18 eeelectrons eefor eethe eeCa++ eeion.

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