General Chemistry Exam Questions -Consider an organic compound with molecular formula, C5H13NO, and the following connectivity between non-H atoms. How many lone pairs and pi bonds will a good Lewis structure for this compound contain

1 a. Consider an organic compound with molecular formula, C5H13NO, and the following connectivity between non-H atoms. How many lone pairs and pi bonds will a good Lewis structure for this compound contain? Hint: Draw one reasonable Lewis structure. All other reasonable Lewis structures will have the same number of lone pairs and pi bonds.

word image 2287 *a. 3 lone pairs and 0 pi bond word image 2288

  1. 3 lone pairs and I pi bond
  2. 2 lone pairs and 1 pi bond
  3. 4 lone pairs and 0 pi bond
  4. 4 lone pairs and I pi bond

I b. Consider an organic compound with molecular formula, C5HHNO, and the following connectivity between non-H atoms. How many lone pairs and pi bonds will a good Lewis structure for this compound contain? Hint: Draw one reasonable Lewis structure. All other reasonable Lewis structures will have the same number of lone pairs and pi bonds.

word image 2289 word image 2290 2 H so voeea

a. 3 lone pairs and 0 pi bond *b. 3 lone pairs and I pi bond

  1. 2 lone pairs and I pi bond
  2. 4 lone pairs and 0 pi bond
  3. 4 lone pairs and 1 pi bond word image 2291

lc. Consider an organic anion with molecular formula, CsI-IRNO- and the following connectiVity between non-H atoms. How many lone pairs and pi bonds will a good Lewis structure for this compound contain? Hint: Draw one reasonable Lewis structure. All other reasonable Lewis structures will have the same number of lone pairs and pi bonds.

word image 2292

  1. 3 lone pairs and 0 pi bond
  2. 3 lone pairs and I pi bond
  3. 2 lone pairs and I pi bond *d. 4 lone pairs and 0 pi bond

e. 4 lone pairs and I pi bond

Exarn

Id. Consider an organic anion with molecular formula, C5H10NO-, and the following connectivity between non-H atoms. How many lone pairs and pi bonds will a good Lewis structure for this compound contain? Hint: Draw one reasonable Lewis structure. All other reasonable Lewis structures will have the same number of lone pairs and pi bonds.

word image 2293 word image 2294 Z H scz&lSk-j o cke* word image 2295

Soword image 2296

  1. 3 lone pairs and 0 pi bond
  2. 3 lone pairs and I pi bond
  3. 2 lone pairs and I pi bond
  4. 4 lone pairs and O pi bond

*e. 4 lone pairs and I pi bond word image 2297

word image 2298 le. Consider an organic cation with molecular formula, C5H12 0+, d the following connectivity between non-H atoms. How many lone pairs and pi bonds will a good Lewis structure for this compound contain? Hint: Draw one reasonable Lewis structure. All other reasonable Lewis structures will have the same number of lone pairs and pi bonds.

word image 2299

  1. 3 lone pairs and 0 pi bond
  2. 3 lone pairs and 1 pi bond *c. 2 lone pairs and I pi bond
  3. 4 lone pairs and 0 pi bond
  4. 4 lone pairs and 1 pi bond

2a. Consider the following Lewis Structure. Is this a good 3D representation of the structure? If not, what is incorrect?

word image 2300

a. Yes. This is a good 3D representation.

*b. No. The VSEPR geometry about C2 and C3 is not correct.

  1. No. The VSEPR geometry around C4 is not correct.
  2. No. The VSEPR geometry around Cl and C5 is not correct.
  3. No. The VSEPR geometry around C3 is not correct.

2b. Consider the following Lewis Structure. Is this a good 3D representation of the structure? If not, what is incorrect?

word image 2301

*a. Yes. This is a good 3D representation.

  1. No. The VSEPR geometry about C2 and C3 is not correct.
  2. No. The VSEPR geometry around C4 is not correct.
  3. No. The VSEPR geometry around Cl and C5 is not correct.
  4. No. The VSEPR geometry around C3 is not correct.

2c. Consider the following Lewis Structure. Is this a good 3D representation of the structure? If not, what is incorrect?

  1. Yes. word image 2302 This is a good 3D representation.
  2. No. The VSEPR geometry about C2 and C3 is not correct.
  3. No. The VSEPR geomefiy around C4 is not correct. *d. No. The VSEPR geometry around Cl and C5 is not correct.

e. No. The VSEPR geometry around C3 is not correct.

3a. What is the molecular formula for the following organic compound drawn in the organic structure shorthand notation?

word image 2303

  1. C9H10N02
  2. C9HIIN02
  3. C7H6N02
  4. C7H7N02

word image 2304 CIOH]3N02

f. CIOHllN02

3b. What is the molecular formula for the following organic compound drawn in the organic structure shorthand notation?

word image 2305

a. C9H10N02 *b. C9HllN02

  1. C7H6N02
  2. C7H7N02
  3. CIOH13N02
  4. CIOHIIN02

word image 2306 3c. What is the molecular formula for the following organic compound drawn in the organic structure shorthand notation?

word image 2307 C 7 BOOword image 2308

  1. C9H10N02
  2. C9HIIN02
  3. C7H6N02 *d. C7H7N02 e. CIOH13N02

f. CIOHllN02

4. Based on the information provided in lecture, what is the acid/base character of the compound in the previous question?

  1. word image 2309 strong acids e—/

word image 2310

C

  1. weak acid
  2. strong base

*d. weak base

e. neutral (does not affect the pH of solution)

5a. What is the VSEPR geometry around the central atom in S022-? You need to first determine the correct Lewis structure to answer this question.

  1. word image 2311 linear
  2. trigonal planar

*c. tetrahedral word image 2312

  1. trigonal bipyramidal
  2. octahedral

5b. What is the VSEPR geometry around the central atom in XeF2? You need to first determine the correct Lewis structure to answer this question.

  1. word image 2313 linear
  2. trigonal planar
  3. tetrahedral *d. trigonal bipyramidal

e. octahedral

word image 2314 Sc. What is the VSEPR geometry around the central atom in NOE? You need to first determine the correct Lewis structure to answer this question.

a. linear

*b. trigonal planar \vca.A

  1. tetrahedral
  2. trigonal bipyramidal
  3. octahedral

5d. What is the VSEPR geometry around the cenfral atom in IFS? You need to first determine the correct Lewis structure to answer this question.

  1. linear
  2. trigonal planar
  3. tetrahedral
  4. word image 2315 trigonal bipyramidal

*e. octahedral

6a. How are structures (l) and (2), shown below, related to each other?

word image 2316 s : word image 2317

(1) (2)

word image 2318 *a. They completely equivalent resonance structures of each other.

  1. They are non-equivalent resonance structures. Structure (l) is better than structure (2).
  2. They are non-equivalent resonance structures. Structure (2) is better than structure (1).
  3. They are different compounds.

6b. How are structures (1) and (2), shown below, related to each other?

  1. word image 2319 They completely equivalent resonance structures of each other.
  2. They are non-equivalent resonance structures. Structure (l) is better than structure (2). *c. They are non-equivalent resonance structures. Structure (2) is better than structure (I).

d. They are different compounds.

6c. How are structures (l) and (2), shown below, related to each other?

word image 2320 S : ck

word image 2321

Z.e

(1) (2)

a. They completely equivalent resonance structures of each other.

*b. They are non-equivalent resonance structures. Structure (1) is better than structure (2).

  1. They are non-equivalent resonance structures. Structure (2) is better than structure (l).
  2. They are different compounds.

c.

word image 2322

7.

An

to

make

a.

SiN03(aq)

b.

Si(aq)

d.

Ag

e.

3AgN03(aq)

*f.

word image 2323 8a. Taking into consideration the answer to the previous question, if 15.0 mL of a 0.0450 M aqueous silver nitrate solution is mixed with 8.00 mL of a 0.0250 M aqueous sodium phosphate solution, how

word image 2324

9. What is the reaction quotient/equilibrium constant expression for the following reaction in terms of concentrations? 3 Fe(s) + 4 H20(g) Fe304(s) + 4 H2(g)

word image 2325

I Oa. The value of K for the reaction in the previous question is 4.6 at 850 0C. A reaction vessel contains

word image 2326 2.0 mol Fe, 0.15 M H20(g), 1.0 mol Fe304(s) and 0.075 M H2(g) at 850 oc . What is the value of Q? Is the reaction at equilibrium? If not, which direction does the reaction go to reach equilibrium? *a. Q = 0.062, rxn goes left to right word image 2327 0.062, rxn goes right to left

  1. Q — 0.0078, rxn goes left to right
  2. Q — 0.0078, rxn goes right to left
  3. Q — 16, rxn goes left to right
  4. Q 16, rxn goes right to left

10b. The value of K for the reaction in the previous question is 4.6 at 850 oc. A reaction vessel contains 2.0 mol Fe, 0.075 M H20(g), 1.0 mol Fe304(s) and 0.15 M H2(g) at 850 oc . What is the value ofQ? Is the reaction at equilibrium? If not, which direction does the reaction go to reach equilibrium?

  1. word image 2328 Q = 0.062, rxn goes left to right
  2. Q = 0.062, rxn goes right to left
  3. Q = 0.0078, rxn goes left to right
  4. Q = 0.0078, rxn goes right to left
  5. Q = 16, rxn goes left to right *f. Q = 16, rxn goes right to left

I I a. Consider the following acid-base reaction. What is the acid for the forward reaction and what is its conjugate base?

word image 2329

word image 2330 a. (l) is the acid for the forward reaction and (2) is its conjugate base *b. (l) is the acid for forward reaction and (3) is its conjugate base

  1. (l) is the acid for forward reaction and (4) is its conjugate base
  2. (2) is the acid for forward reaction and (l) is its conjugate base
  3. (2) is the acid for forward reaction and (3) is its conjugate base
  4. (2) is the acid for forward reaction and (4) is its conjugate base

I I b. Consider the following acid-base reaction. What is the base for the forward reaction and what is its conjugate acid?

word image 2331

C.ÄO

(1) (2) (3) (4)

  1. (l) is the base for the forward reaction and (2) is its conjugate acid
  2. (l) is the base for forward reaction and (3) is its conjugate acid
  3. (l) is the base for forward reaction and (4) is its conjugate acid
  4. (2) is the base for forward reaction and (1) is its conjugate acid
  5. (2) is the base for forward reaction and (3) is its conjugate acid *f. (2) is the base for forward reaction and (4) is its conjugate acid

1

12a. K = 200 for the acid-base reaction in the previous question. What is the strongest acid involved in this reaction? Ac(01 6 xse

word image 2332

iC

*a. (l)

12b. K = 200 for the acid-base reaction in the previous question. What is the strongest base involved in this reaction?

word image 2333

word image 2334

12c. K = 200 for the acid-base reaction in the previous question. What is the weakest acid involved in this reaction?

word image 2335

word image 2336

12d. K = 200 for the acid-base reaction in the previous question. What is the weakest base involved in this reaction?

word image 2337

word image 2338 word image 2339 13a. Which of the following indicate that a solution is acidic?

a. [H30+] = 7 M word image 2340

*b. [OH-I = I.OxlO-10 M word image 2341

  1. pH = 7.0
  2. pOH= 3.O

13b. Which of the following indicate that a solution is acidic?

  1. [H30+] = net-.x«cca
  2. [OH-I = 10-3 M banc
  3. pH = 7.0 word image 2342 *d. POH = 10.0 word image 2343 1

word image 2344 13c. Which of the following indicate that a solution is basic?

word image 2345

d.

p0H=

10.0

13d. Which of the following indicate that a solution is basic?

word image 2346

word image 2347

b. 4.36

word image 2348

*d. 4.351

f. 4.4

14c. The [H30+] of an aqueous solution(is 2.3 x 10 10 M What is the POH of the solution to the correct number of significant figures?

6

d. 4.351 e

f. 44

word image 2349

word image 2350 word image 2351 15a. 0.15 g ofLiOH (mw = 23.95) is dissolved in 350. mL of water. What is the pH of the resulting solution?

*b. 12.25

  1. 12.63
  2. 10.25

15b. 0.015 g ofLiOH (mw = 23.95) is dissolved in 3.5 L of water. What is the pH of the resulting solution?

b. 12.25

word image 2352

How

many

«-z37

word image 2353 10.25

16a. You have available aqueous stock solutions of 0.125 M of which stock solution should you use to make 3.50 L of a pH 3 SO aqueous solution?

word image 2354 s o Vuoo,-s

  1. N2H4 + H20 N2H3- + H30

word image 2355

*a.

8.9

mL

1–N03

  1. N2H4 + H20 N2H5 + OH *c. N2H4 + H20 N2H5+ + OH-
  2. N2H4 + OH N2H3 + H20
  3. N2H4 + OH- N2H3- + H20

17b. What is the acid dissociation reaction for formic acid, HC02H?

word image 2356 HC02H + H20 HC02- + H30+

  1. HC02H + 1-130+ HC02H2+ + H20
  2. HC02H + OH- word image 2357 HC02Ä + H20
  3. HC02H + H20 word image 2358 HC02 + H30
  4. HC02H + H20 word image 2359 HC02H2 + OH

word image 2360

18a. What is the pH of a 0.30 M solution of hydrazine? Kb ofN2H4 1.7 x 10 6

word image 2361

19a. In lecture we discussed the fact that the equilibrium position (relative amounts of products to reactants) for reactions in which there are an unequal number of reactants and products will be concentration dependent. This was mentioned in the context ofexplaining why the % ionization of a weak acid or base depends on concentration, but it is true for other equilibria.

Consider the reaction A + B C. The reaction is started with 0.10 M A, 0.10 M B and no C and allowed to come to equilibrium. At equilibrium, the A and B concentrations will have decreased and the C concentration will have increased to give a particular value for [C]/[A]. If the reaction is run again, starting with 0.010M A, 0.010 M B and no C, how will the [C]/[A] and ratios change compared to the first time the reaction was run? [This is an “A” question.]

word image 2362 word image 2363 word image 2364 a. [C]/[A] = [C]/[B] at equilibria; both will increase *b. [C]/[A] = at equilibria; both will decrease

word image 2365

(“enc

c. [C]/[A] = [C]/[B] at equilibria; both will stay the same

c

S-c word image 2366

19b. In lecture we discussed the fact that the equilibrium position (relative amounts of products to reactants) for reactions in which there are an unequal number of reactants and products will be concentration dependent. This was mentioned in the context of explaining why the % ionimtion of a weak acid or base depends on concentration, but it is üue for other equilibria.

Consider the reaction A + B C. The reaction is started with 0.10 M A, 0.10 M B and no C and allowed to come to equilibrium. At equilibrium, the A and B concentrations will have decreased and the C concentration will have increased to give a particular value for [C]/[A]. If the reaction is run again, starting with 1.0 M A, 1.0 M B and no C, how will the [C]/[A] and [C]/[B] ratios change compared to the first time the reaction was run? [This is an “A” question.]

word image 2367 co O cc1Q

20a. Consider again the following reaction, which has a K (in terms of concentrations) = 4.6 at 850 oc:

3 Fe(s) + 4 H20(g) -e Fe304(s) + 4 H2(g)

The reaction is started with 0.10 M 1-120 and excess Fe. What is the concenfration ofH2 at equilibrium?

Hint: Set up a reaction table (ICE diagram) to determine mathematical expressions for the concentrations word image 2368 at equilibrium. [This is the other “A” question. I

20b. Consider again the following reaction, which has a K (in tenns of concentrations) = 4.6 at 850 DC:

3 Fe(s) + 4 H20(g) Fe304(s) + 4 H2(g)

word image 2369 The reaction is started with 0.040 M H20 and excess Fe. What is the concentration ofH2 at equilibrium? Hint: Set up a reaction table (ICE diagrarn) to determine mathematical expressions for the concentrations at equilibrium. [This is the other “A” question.]

a. 0.059M

word image 2370 0.024 M

  1. 0.017M
  2. 0.036 M
  3. 0.28 M

q i gsx x

Ехат 2- ВВ Format

1. Info for All Acid/Base Questions:

Acids

 

ка2

 

каз

снзсом

-5

   

носнсом

—4

   

нзвоз

word image 2371

   

word image 2372

1.4 х 10—3

 

-4

 

HClO

word image 2373

   

њсоз

word image 2374

   

НзРО4

—3

 

-8

word image 2375

H2S04

very large

   
 

—4

   

Bases

    
     

CH3NH2

word image 2376

   

(CH3)3N

—5

   

C6H5NH2

4.0 x10-10

   

word image 2377

ка кь кд, 1.008 х 10 -14 РН — РКа + l.og baseacid рка word image 2378

1 а. What is the рн 0f а burer composed 0f 0.25 М НОСЊСОМ and 0.15 М М[НОСН2СО2]?

а..жа..К а а word image 2379 е+осиссаи word image 2380

word image 2381

3.8iH

word image 2382 Ьак

асха

d. 4.60

word image 2383 Ь. What is the рн 0f а buffer composed 0f О. 15 М НОСНСОМ and 0.25 М М[НОСН2СО2]?

word image 2384 word image 2385 4.05 word image 2386

d. 4.60

1 с. What is the рн 0f а burer composed 0f 0.30 М НОСЊСОМ and 0.050 М М[НОСН2СО2]?

word image 2387 word image 2388 т- о ,0so

О ВЪО

d. 4.60

word image 2389

1 d. What is the pH of a buffer composed of 0.050 M HOCH2C02H and 0.30 M Na[HOCH2C02]?

word image 2390 *d. 4.60 word image 2391

2. What buffer component ratio, base/acid, would be needed to make a pH 4.50 buffer using a mixture of HOCH2C02H and Na[HOCH2C02]?

– base

b. 0.21

 
  1. 1.0
  2. 3.6

1 0

a c.aic..*

Hoc LCOL*

3a. How yaaoles ofNaOH would need to be added to 500. mL of a 0.20 M HOCH2C02H solution to ma e a pH 4.5 uffer? (Harder question that you may want to come back toe…You will need to use ormaåon detemined in the previ9question to answer this.)

*a. 0.083 mol

O bQR –

  1. 0.017 mol
  2. 2.6xlO-3 mol O O
  3. 0.012 mol

e. 3 mol X (01010-3) oa t-lg -’10 sne – N.JaoH

3b. How many moles need to be added t 100. mL of a 0.15 M Na[HOCH2CO solution to make a pH 4.50 buffer? (Harder question that you may want to come back t . . * .You will need_to use

information determined in the prpvious question to answer this.) > DI too C—- 0 iOtS¯

(Dose )

H ockLC0i_— a. 0.083 mol

X

b. 0.017 mol – 0.01s–k *c. 2.6×10-3 mol

286

  1. 0.012 mol o Ots—
  2. 8.1 x 10-3 mol — X =

0.0B- – S $ F

4a. Which one of the following acids and bases exists mainly as +1 cation t pH 8.5? (Another harder question that you might want to come back to… )

a. H3B03 Gab – ioc

*b. (CH3)3N –

C. C6H5NH2

d. HCIO

q JD

So

—-1 OJ CLS7_-

word image 2392 4b. Which one of the following acids and bases exists mainly ata —l anion)t pH 8.5? (Another harder question that you might want to come back to… )

  1. H3B03
  2. (CH3)3N
  3. C6H5NH2 *d. HCIO

5. 30.0 mL of a 0.090 M aqueous solution of KOH (in flask) is titrated with 0.150 M HBr (in buret). What is the overall reaction that takes place? word image 2393

*a. KOH(aq) + HBr(aq) H20(l) + KBr(aq)

  1. KOH(aq) + HBr(aq) KO(aq) + H2Br(aq)
  2. KOH(aq) + HBr(aq) H20(l) + KH(aq) + HBrO(aq)
  3. KOH(aq) K+(aq) + OH-(aq) e, I-Br(aq) + H20(1) H30+(aq) + Br-(aq)

word image 2394 6a. Consider the following titration (which is the same as the previous question): 30.0 mL of a 0.090 M aqueous solution of KOH (in flask) is titrated with 0.150 M HBr (in buret). How is the solution in the flask best characterized after some HBr is added but before the equivalence point is reached?

  1. buffer
  2. strong acid
  3. weak acid *d. strong base
  4. weak base
  5. neutral

6b. Consider the following titration (which is the same as the previous question): 30.0 mL of a 0.090 M aqueous solution of KOH (in flask) is tifrated with 0.150 M HBr (in buret). How is the solution in the flask best characterized at the equivalence point of the titration?

  1. buffer
  2. strong acid
  3. weak acid
  4. strong base
  5. weak base *f. neutral

6c. Consider the following titration (which is the same as the previous question): 30.0 mL of a 0.090 M aqueous solution of KOH (in flask) is tifrated with 0.150 M I-IBr (in buret). How is the solution in the flask best characterized past the equivalence point of the titration?

a. buffer *b. strong acid

  1. weak acid
  2. strong base
  3. weak base
  4. neutral

word image 2395

word image 2396 word image 2397 7b. Consider the following titration (which is the same as the previous question): 30.0 mL of a 0.090 M aqueous lution of KOH (in flask) is titrated with 0.15 M HBr (in buret). What is the pH of the solution aft 16.0 mLo HBr has been added? (You first need to calculate the equivalence point of the titration to answe question correctly.)

a. 12.87 Cote-I

*c. 11.81

f. 11.49

word image 2398 7c. Consider the following titration (which is the same as the previous question): 30.0 mL of a 0.090 M aqueous solutkon of KOH (in flask) is titrated with 0.15 M HBr (in buret). What is the pH of the solution after 19.0 mL gfÄ-IBr has been added? (You first need to calculate the equivalence point of the titration to a%swermthis question correctly.)

  1. 12.87
  2. 1.13
  3. 11.81
  4. 2.19

word image 2399 2.51

f. 11.49

8a. What is the Ksp expression for nickel(ll) ph’osphate?

word image 2400

8b. What is the Ksp expression for aluminum hydroxide?

word image 2401word image 2402(0803 (s) (at)word image 2403

word image 2404 9a. Ksp of copper(l) oxide is

word image 2405

M

*a. 7.9 x 104 M

b. 4.5 x 10-8 M

word image 2406 word image 2407 9b. Ksp of magnesium phosphate is I what is the molar solubility of magnesium phosphate in pure word image 2408 water at 25 C?

I Oa. Lead(ll) chloride is poorly soluble in water. Which of the following would you expect to increase the

  1. Add sodium chloride.

word image 2409

solubility

of

lead(ll)

*d.

Add

a

ligand

10b.

Lead(ll)

chloride

the

solubility

of

  1. Add nitric acid. C. Add sodium phosphate.

e. None of the

*a. Add sodium chloride.

  1. Add nitric acid.
  2. Add sodium phosphate.
  3. Add a ligand that forms a complex ion with lead(ll)
  4. None of the other choices.

I la. Iron(lll) forms a complex ion with 6 cyanides. What is the Kf expression for formation of this complex ion?

word image 2410 > word image 2411

6

word image 2412

3

)

I I b. Iron(ll) forms a complex ion with 6 cyanides. What is the Kf expression for formation of this complex ion?

word image 2413 +- CC to-Czt) -e word image 2414

word image 2415 word image 2416 CFeCcO, -a

C?’ a coo-QC

word image 2417 word image 2418 12a. Le Chatelier’s principle applies to all reactions at equilibrium, not just solubility equilibria. Consider the following reaction: N2(g) + 3 H2(g) 2NH3(g)

word image 2419 IfNH3(g) was removed from a mixture ofN2, H2 and NH3 at equilibrium, how would the reaction respond? word image 2420 — SH(.PTS HT,

*a. The reaction would shift to the RIGHT and the amount ofN2 and H2 in the mixture would

DECREASE.

  1. The reaction would shift to the LEFT and the amount ofN2 and H2 in the mixture would DECREASE.
  2. The reaction would shift to the RIGHT and the amount ofN2 and H2 in the mixture would INCREASE.
  3. The reaction would shift to the LEFT and the amount ofN2 and 1–12 in the mixture would INCREASE.
  4. No change would occur.

12b. Le Chatelier’s principle applies to all reactions at equilibrium, not just solubility equilibria.

Consider the following reaction: N2(g) + 3 H2(g) 2NH3(g)

If more NH3 was added to a mixture ofN2, H2 and NH3 at equilibrium, how would the reaction respond?

  1. word image 2421 The reaction would shift to the RIGHT and the amount ofN2 and 1-12 in the mixture word image 2422 would

DECREASE. so

  1. The reaction would shift to the LEFT and the amount ofN2 and 1–12 in the mixture would DECREASE.
  2. The reaction would shift to the RIGHT and the amount ofN2 and H2 in the mixture would INCREASE.i.P word image 2423

*d. The reaction would shift to the LEFT and the amount ofN2 and H2 in the mixture would INCREASE. av…(

e. No change would occur. word image 2424

word image 2425

12c. Le Chatelier’s principle applies to all reactions at equilibrium, not just solubility equilibria. Consider the following reaction: N2(g) + 3 H2(g) 2NH3(g)

If more 1-12 was added to a mixture ofN2, 1–12 and NH3 at equilibrium, how would the reaction respond?

word image 2426 h) word image 2427 .SHiP7S meayu mo;e j.s Se word image 2428

a. The reaction would shift to the RIGHT and the amount ofNH3 in the mixture would DECREASE.

b, The reaction would shift to the LEFT and the amount ofNH3 in the mixture would DECREASE. *c. The reaction would shift to the RIGHT and the amount ofNH3 in the mixture would INCREASE. word image 2429

  1. The reaction would shift to the LEFT and the amount ofNH3 in the mixture would INCREASE.
  2. No change would occur.

13a. Based on the Ksp of manganese(ll) hydroxide (Ksp = I .6x 10-13), what is the highest pH that you can take a I .0 x 10-4 M solution of manganese(ll) nitrate without causing manganese(ll) hydroxide to

*a. just under pH 9.60 b. just under pH 2.60

word image 2430

13b.

Based

on

the

Ksp

of

manganese(ll)

a

I

.0

x

10

-6

M

solution

of

manganese(ll)

precipitate?

  1. just under pH 10.20
  2. just under pH I I .40
  3. just under pH 4.40
  4. just under pH 9.60
  5. just under pH 2.60 *c. just under pH 10.60
  6. just under pH 11.40
  7. just under pH 4.40

14a. A physical process, such as a chemical reaction, that results in an increase in entropy of the system is one in which…

\ v•hcRAse *a. the order in the system decreases. Soya-er-_,

word image 2431

c-.vease_s

  1. the order in the system increases.
  2. the energy of the system increases.
  3. the energy of the system decreases.

14b. A physical process, such as a chemical reaction, that results in an increase in enthalpy of the system

is one in which. word image 2432

  1. word image 2433 word image 2434 the order in the system decreases. c.-vecs-e
  2. the order in the system increases. *c. the energy of the system increases.

d. the energy of the system decreases.

word image 2435

1 5b. Which of the following reactions will most likely have AS O 0?

word image 2436 a. NH4N03(s) NH4+(aq) + N03-(aq) as *b. CO(g) + H20(g) -4 C02(g) + H2(g) As

  1. U02(s) + 4 HF(g) -9 UF4(s) + 2 H20(g) B s < O
  2. 2 HI(g) -4 H2(g) + 126) a s < o

1 5c. Which of the following reactions will most likely have AS O < 0?

  1. MLN03(s) -9 + N03-(aq)

word image 2437

as

  1. CO(g) + -9 C02(g) + H2(g)
  2. UF4(s) + 2 H20(g) -+ U02(s) +4 HF(g) AS nek word image 2438 in word image 2439 *d. 2 Hi(g) -9 H2(g) + 126) word image 2440

16. What are the three laws of thermodynamics?

  1. The total energy of the universe is
  2. The total entropy of the universe for a spontaneous process.

word image 2441

JU

  1. The entropy of a perfectly ordered system is -Zeroat 0K.

word image 2442

The answers in order are

*a. constant, increases, zero

  1. positive, increases, zero
  2. constant, decreases, zero
  3. positive, increases, positive
  4. constant, increases, positive
  5. positive, decreases, positive

2

Consider the following Table of Thermodynamic Values (at 25 oc) for the next 2 questions:

Com ound

AHF, kJ

so, J/K

AGO, kJ

CH4

—74.9

186.1

-50.81

CC14

 

309.7

-53.7

CC14 1

-139

214.4

-68.6

C12

 

223.0

0

HCI

—92.3

186.8

95.3

HCI a

 

-167.5

55.1

-131.2

ASßan word image 2443 Esoproducts reactants

word image 2444H/,products ¯ word image 2445 f,rettctants

word image 2446Gf,products ¯ Gfxeactants rxn word image 2447 rxn word image 2448

AGO

word image 2449 RT1nK word image 2450

R = word image 2451 kJ/(m01.K) O oc 273.15 K

17a. What is ASO of the following reaction? CH4(g) + 4 C12(g) -+ CC14(g) + 4 HCl(g)

word image 2452

*a.

b.

212.0

c.

-548.0

d.

548.0

e.

376.4

f.-376.4

17b. What is ASO ofthe following reaction? CC14(g) + 4 HCl(g) -9 CH4(g) + 4 C12(g)

word image 2453 a. -212.0 JRC 2-(.2*b. 212.0 J/KD

  1. -548.0 J/K
  2. 548.0 J/K
  3. 376.4 J/K

f.-376.4 J/K

lic. What is ASOof the following reaction? CC14(g) + 4 HCl(aq) -+ CH4(g) + 4 C12(g)

  1. -212.0 Ss,l
  2. 212.0 J/K
  3. -548.0 J/K *d. 548.0 J/K

word image 2454

OS

O

e. 376.4 J/K

f.-376.4 J/K

17d. What is ASO of the following reaction? CH4(g) + 4 C12(g) CC14(g) + 4 HCl(aq)

so 213.0 word image 2455

  1. -212.0 JR
  2. word image 2456 word image 2457 word image 2458 212.0 J/K

word image 2459 -548.0 J/K OSO = + q (zu.ö)

  1. 548.0 J/K
  2. 376.4 JR

f.-376.4 J/K

o

1 8a. Considering the thermodynamic values given in the previous question, what is K at 25 c for the

word image 2460

following

word image 2461 1 8b. Considering the thermodynamic values given in the previous question, what is K at 25 o c for the following reaction? CC14(I) CC14(g)

word image 2462

-C-

cacks)

word image 2463 1 8c. Considering the thermodynamic values given in the previous question, what is K at 25 oc for the following reaction? HCl(g) HCl(aq)

word image 2464

-131.21<5

-c-qs-.s

1 8d. Considering the thermodynamic values given in the previous question, what is K at 25 oc for the following reaction? HCl(aq) a HCl(g)

word image 2465 word image 2466 b. 2.5×10 3 word image 2467

Z—

19a. If a reaction has ASO < 0 and AHO < 0, which one of the following will be true?

  1. The reaction will have K>l at all temperatures.

word image 2468

so

  1. The reaction will have K<l at all temperatures.
  2. The reaction will have K<l at low temperatures and K>l at high temperatures. *d. The reaction will have K>l at low temperatures and K<l at high temperatures.

19b. If a reaction has ASO > 0 and AHO > 0, which one of the following will be true?

  1. The reaction will have K>l at all temperatures.
  2. The reaction will have K<l at all temperatures.

*c. The reaction will have K<l at low temperatures and K>l at high temperatures.

d. The reaction will have K>l at low temperatures and at high temperatures.

19c. If a reaction has ASO > 0 and AHO < 0, which one of the following will be true?

*a. The reaction will have K>l at all temperatures. word image 2469

  1. The reaction will have K<l at all temperatures.
  2. The reaction will have K<l at low temperatures and K>l at high temperatures.
  3. The reaction will have K>l at low temperatures and K<l at high temperatures.

19d. If a reaction has ASO < 0 and AHO > 0, which one of the following will be true?

a. The reaction will have K>l at all temperatures. word image 2470 *b. The reaction will have K<l at all temperatures.

  1. The reaction will have K<l at low temperatures and K>l at high temperatures.
  2. The reaction will have K>l at low temperatures and K<l at high temperatures.

20a, Which of the following has to be true for a spontaneous process?

word image 2471 *a. AG<O b. AG> O D

  1. AGO < o
  2. AGO > O

word image 2472

f. ASO >O

20b. Which of the following has to be true for a non-spontaneous process?

word image 2473

word image 2474 AG> O

  1. AGO < o
  2. AGO > O

word image 2475

f. AS O > O

2 —

20c. Which of the following has to be true for a reaction with K > ?

word image 2476

word image 2477 b. AG>O *c. AGO < 0

  1. AGO > 0
  2. AS O word image 2478
  3. AS O >O

20d. Which of the following has to be true for a reaction with K < 1 ?

word image 2479

  1. AG> O
  2. AGO < O *d. AGO > O
  3. AS O word image 2480
  4. AS O > O

Periodic Table of the Elements word image 2481

word image 2482

18

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