Exam 2 Review

Supplemental lnstructionIowa State University

Instructor: AppyChemlTT

Date: 3l8ll5

l. Classift the following ionic compounds as soluble or insoluble:a. NaCN Sb. AgCl f

(rus*)rs S

L-!fl.u'*)= se. Lh[.[r31

2. Determine the oxidation state of nitrogen in each of the following:NHs ;JNzO+ +{NaNO: a5'

3. Using the activity series, write balanced chemical equations for the following reactions.

[+Br; ftX+B

c.d.

a.b.c.

b. Hydrogen gas is passed over a sample of zinc oxideN0 (xn, He * hr;nm ueA ln SoriCIg.

2. How many milliliters of solution would contain 45.0 g sucrose ([izfl:rr(lrr) is themolaritywere4.0eM? 45,0qxj#$, = 0,lgl rset Cs1H11ft1 ft.=.f:*i4 0q fl= o#l#L =o,igr{ut#,or; HffiL'LL t' -L-

3. What is the molarity of a solution of HrPOn is 50.00 fu_I ofiTl5fitrated with 25.86 ml of0.1201 M NaOH? Assume that all three hydrogens in H:PO+ react with NaOH.

a. Mg is added to a solution of silver nitrate

fngrrt r L[Nos(nr) -+ fng({ot fac)* 2e$ {s\

0, {-$ mql_ x 0, r-00 L , @]g 'lul} * br*}tl1qll ror's,

L I fl1ot rl1soq " 'J-rnrl lunt5. Balance the following equation and give the net ionic equation:

HiPoqhf)3Naotl*) Naf04u*tBH:$1r1 ' Ml,gb rnlNa[u" dhi-* o,t1ot*'o \tgtdg:

ffi+f*ou

ft mus+ bh,gnar {nnn

1.61%t$-fro14. How many K* ions are there in 200.0 mL of a 0.20 M KzSO+ sotuti6r,t ftl:;* vt4lll.r

I o.o5-L

r{rI}o+(sq) + /11(J{o,},(at} -*Xttt$*(.aq} + fl{f,#n(s}rr; 3,/t@ .*6;;;; - r' s1t* r ffi6-* 3 *", z{a,bb tltttg*r+"&rtudir,1

N:f; )0q 37aq\ t *P*tr,h -+ fr1}0q$\6. Which of the following sets of quantum numbers is invalid?

A, U:6,1='.lrilll: -1,fl1, - +jb. ft=[rI:{Jr}rt1 :Ll,tn"= -i

Q tl: 5,1:4, mr:3, ?an = *1d. 'ft = *rI: f,,ml : H.tnr.: +*

4,$x1021 l(Etrli

1060 Hixson-Lied Str*dent Success Center * 515-294-6624 * sistaff@iastate.edu * hup://www.si.iastate.edu

7. Which one of the following sets of quantum numbers corresponds to a 6p electron?y'" = 6,1= f,#tr -;4,m, = +:d "=6,yJ.rw:o'?nr'= -i{ ,fit = },rlli - -1,m, = -}@ tr = 6,I = f,lrrt - -lrr??s = +i

8. Write the noble gas core electron configuration for the following species:a. Mg $q\r,

a. Mg>Na>P>Si>Arb. Ar>Si>P>N A>Mg-c. Si>P:-ao>trta>Mgar.N#tvtg>si>P>Ar/o. Ar>P>Si>Mg>Na

10. A neon atom emits light at many wavelengths, two of which are at616.4 and 638.3 nm.Both of these transitions are to the same final state.

a. What is the energy difference between the two states for each transition?

g Mg?

If a transition between the two higtier*energy states could be observed,

-/,,.. .: \_!,0{.ost0-20 r-}rved-_ilE_af_<bl1p,r'1 v l0-Qrr'

would be the frequency of the light?

\l : E- =- t.b[o x W13 { =-f-

l 1. which atomic ".1), n* 3 t- l, bor tors r'{L{r5a. 3s and 3pb. b. 3s and 4s

$ c.4s and 4pd. d. All p atomic orbitals

12. What is the frequency of yellow light with wavele h of 595 nm?

\--k=ary}ffi= 5,0t{ xl0lq t"'(uz)13. What volume of 1.57 M HCI would react

nag(.s) + zH[I(c{} * ff,(g} + It$g[,](aq]gL,6p#t*'md L(nol *g! * l'05{Yl "- lil0l

rnDl HLl I *r- r***--1tr,fry rTl= l,fiS B'!- tV= I,qU

b. z** fkrl 3d'o

following gives the correct order foratotf,i6 radius for Mg, Na, P, Si, and.\-..- 9A

--\\.-. .---'u

14. A 0.500 g sample of naphthalene (C10H8) is burned in a bomb calorimeter containing650 grams of water at an initial temperature of 20.00"C. After the reaction, the finaltemperature of the water is 26.4"C. The heat capacity of the calorimeter is 420 J/"C.

- Using these data, calculate the heat of combustion of naphthalene in kJ/mol.* * {rxn = {surr {suc. =^ Lkoqbg\(q,rarqc) (ru,a oL- L0,8o{ouq,c\tlb,a,c-ro$

{surr-- L0,0f? L{ r

15. Determine the final temperature when 10.0 g of aluminum at 130.0 oC mixes with 200.0grams of water at25.0 oC. The specific heat of aluminum is 0.901 J/g oC. (Coffee cup

17. A piece of copper metal of mass 6.22kg is heated from 20.5 oC to 324.3 oC.

calorimeter problem.) X -1p{=.LHN- ['u $X$ .t]l 4_gOq - r3o

oc\l = {oo$q,B{sfi(4- 16o}

{t * [lo,T'c16. Find the AHo',n for CzHo(g1+ l12 Oz(g) ) 2 CAz(e) + 3 HzO(g)

AHor CzHo(e) = -84.2 kJ/mol .pf 0d0c+s- f pAdax{3AH'rCOz(B) = -393.5 kJ/molAHorHzO(g)= -241.8 kJ/mol /, \ , ,*'

il1"i"' ((L; - iq"'i,' o" n-"/moj) r ta * - L4t.bracTnro\] - {Ux - aq,? "7p}{;]the heat absorbed by the metal. Specific heat is 0.386J/g'C.

q:ficbr =- (t tto 3\(0. figt*vg,h|stu,30c- ,-0,5'c\ ".18. If 3.4 kJ of heat flows out of the system while 4.8 kJ of work is done by the system on the

surroundings, what is the internal energy?

f =4+ t4 - - 3.4ltd +

19. Given the following reactions,

AHo : -1429 kJ. How much energy is released if 15.7 g of silane is burned?

_btB tL{

I

6,1xlil-ts m

AHo=-l,

Lt,bt/:r-*ru"[4

2xsf+ k rrr) 2 So:(e) AH : -7eo kJ

hi\ , XLG(t) + oz(e) ) Soz (e) . AH = -227 q' '\ I - ' _1-S0 2 /4\ -) tsfSirUs{ts\ Au-- 1qq WWhat is AHo for the reacfion Z SOz(g) + Oz(g) > Z SOr(g)?

Mtsoar$\IAH = lq{p L{)

Zu. wnrerffirCaCOs.Ctt*:* C1r1 +?,r.0irq) + Cat'oggq1

21. Silane, SiH+, burns according to the relction, SiH+ + 2 Oz ) SiOz + 2 HzO, with

AHo/lt]ol txn \d,rtgSiH4 yMy :HTqLr _' 3l'tzY \ rroffi -22.lArl4s23d6 is the electron configuration of a(n)-[Q- atom.

23. The wavelength of a photon that has energy of 6.33* l0-r8J i, 3' I XtO-?n V:\nL(, ,&4$ ,D-rsf = (to, {ot{oxro-sr'l5.t\{3xlon rnl&

h?

24.

25. Which of the following is an excited-state electron configuration?a) 1s2 2s2 3ptb) 1s2 2s2 2p6

G)) 1s2 2s2 2p4 3slii tart 4s2 3dro 4pl

26. The retina of a "predator" eye can function in nearly dark condition, at 2.00* 10'17J. Forlight of 685 nm wavelength, how many photons does this energy correspond to?

L= {.} z. 3,0x10b0/s = V ({ohr x/0-q'{V = t{, 3b tr I0 t.t S- I (Hz\

) 1.00[,0-t? { =* E tte.tgtb{,6-sqf"s\{q, ?sx dgrq $-\

€{h.1)

'f,= bb,q bhU*ont e {sq ph#ans