Unit 3 Practice Exam Name:

Unit 3 Practice Exam

Name: _________________ *Disclaimer: This practice exam is not to be your only source of material to review before the exam and may not entire all of the concepts tested on your exam*

1. Which of the following compounds are soluble a. Ba(NO3)2

b. PbI2 c. AgSO4 d. FeCl2

2. A solution of barium chloride is mixed with a solution of potassium sulfate and a precipitate forms. Write the reaction and identify the precipitate.

a. BaCl2 b. BaSO4 c. K2SO4 d. KCl

3. Which of the following interactions would be strongest in a dilute aqueous NaCl solution? a. Solute-Solute

b. Solute-Solvent c. Solvent-Solvent

4. Identify which of the following compounds is a strong electrolyte a. Glucose (C6H12O6)

b. Methane (CH4)

c. Carbonic Acid (H2CO3) d. Sulfuric Acid (H2SO4)

5. Which of the following answer choices indicates the correct coefficient for O2 when the equation is balanced?

C6H14 (g) + O2 (g) → CO2 (g) + H2O (g)

a. 8 b. 20 c. 19 d. 6

6. Which of the following correctly identifies the products of a combustion reaction? a. Water (H2O) and Salt

b. Water (H2O) and CO2 c. Water (H2O) and C4H9 d. None of the above

7. What mass of oxygen is present in a 0.650 mole of sucrose (C12H22O11)? ** made up a. 114.33 g

b. 60 g c. 108 g d. 14.4 g

8. Name the compound Se5Br2 a. Selenium Bromide

key

LOOK at _solubility rules!

→ NO3 Always soluble • I typically soluble

unless paired w/Pb

•Soy typically soluble unless

paired w/ _ng

u Cl typically soluble unless paired w/ Ag, Hg,or Pb

1. Back

t Kus04 →_{2 KCI} t _Basoy

2. Assign solubility rules Backcag, t KasOucag,

→ _Bad04 t Zkclcag,

↳ precipitate=

solidthat forms

, other examples:HCl, Hzsoy, NaOH,

↳conducts _electricity KOH

↳

completely dissociates weak _electrolytes: Acetic Acid( HGH_,Oz)

,

in water _{carbonic Acid ( H2 COs)}

, Ammonia (NH's) ,

↳_Strong Acids _phosphoric Acid_{I Hzpoy)} ↳ All weakAcids1Bases

2

(

₁₉ 6 7

)

C : 6 2 fit6 Hi 14 Hi 2114 O iz Oi 31/3/19

↳

_zcatliy t 1902 → _{12COz t 14 H2O}

toooo

0.650 MOI _{x 11¥ x}

¥0

⇐

1M01C¥zHi

,

smog

114.33g

↳ ₂ nonmetals

prefixt Nameof t prefixt Nameof

litelement _2ndelement

b. Heptaselenium Dibromide c. Pentaselenium Dibromide d. Hexaselenium Dibromide

9. How many moles of sodium ions (Na+) are in 274 g of sodium carbonate (Na2CO3). a. 5.17 mol Na+

b. 7.88 mol Na+ c. 4.93 mol Na+ d. 1.991 mol Na+

10. Consider a reaction between chromium(III)nitrate and sodium phosphate. Write out the chemical equation and identify which species are spectator ions.

a. Cr3+, PO43- b. Cr3+, NO3- c. Na+, NO3- d. PO43-, NO3-

11. To what volume should you dilute a 112 mL of a 17.4 M stock NaCl solution to obtain 0.400 M NaCl solution?

a. 112 L b. 52.2 L c. 3.78 L d. 5.22 L

12. What mass of KCl is needed to make a 0.374 M solution in 150 mL? a. 6.23 g

b. 5.22 g c. 4.18 g d. 3.74 g

13. What is the concentration of a solution containing 12.82 g MgSO4s in a 1000 mL solution?

a. .11 M b. 100.1 M c. 1100 M d. 11.1 M

14. What are the correct coefficients (reading from left to right) when the chemical equation shown below is balanced?

Fe2O3 + C → Fe + CO2

a. 1, 2, 3, 4, b. 2, 3, 4, 3, c. 0, 2, 3, 4 d. 2, 3, 3, 4

15. Solution A is composed of a 3.00 M aqueous solution of HCl. Solution B is composed of a 1.5 M aqueous solution of HCl. Which of the aforementioned compounds is the more dilute solution?

a. Solution A b. Solution B

c. They are equally dilute

16. (T/F) The products of a neutralization reaction are carbon dioxide and water. a. True

b. False

17. What volume (in L) of a 8.75 M SrCl2 will completely react with 450 mL of a 5.75 M AgNO3 solution?

MM OF Nazca3=105.98 91mm

2749¥"

oyiinmoina.ca#--5.l7molNatqCr3tqNO5

,Nat qPOy3

-Cr (NO3)_z t _Nazpoy → _Cr Poy _(g) t NANO , lag) Mir,-- Mzvz Vz -- MI = 117.4M

)

f.

112L) MZ BEAT

_YE

= 4.872 M- MOI IL 0.374M -→0.15 . 0.374 - Xmotx # 0.0561 Mol 141×74-5519 O.# lmolkll

B.

-4.18g

↳ AKA _Molarity

12.82g

mgfoyx.jo?zlyyMggn-Og4gy=O.lO65076moiMgS0y

_-3.196,5M€

= . 1065M 2 3 4 3 Fe : 214 Fe :X 214 O : ₃₁₆ 0:26 C ' i X3 C_:X 3 A: _3M B: 1.5M H2O t Salt V_, Mi Vz Mz 1. Balance

equation

SrCl2(aq) + AgNO3(aq) → AgCl(s) + Sr(NO3)2(aq) a. 296 mL

b. 148 mL c. 215 mL d. 199 mL

18. What is the oxidation number of Hg in Hg(PO4)2? a. +1

b. +2 c. -1 d. +3

19. Which of the following is NOT a greenhouse gas? a. Water vapor

b. Carbon Dioxide c. Ozone

d. Oxygen

20. Identify the oxidizing agent in the following reaction

3 Mg(s) + N2(g) → Mg3N2(s)

a. Mg b. N2 c. Mg3N2

21. Name of compound HNO2(aq) a. Nitrous Acid

b. Nitric Acid c. Nitrogen Acid d. Hydronitric Acid 22. Match the following

a. ClO- ___ Chlorite b. ClO2- ___ Perchlorate c. ClO3- ___ Chlorate d. ClO4- ___ Hypochlorite 23. Name the compound: Li2S

a. Lithium sulfide

b. Dilithium monosulfide c. Lithium sulfate

d. Dilithium monosulfide

24. Which compound would form between sodium and sulfur a. Na3S

b. S3Na2 c. NaS d. Na2S

25. Antimony reacts with sulfur according to the equation

2Sb(s) + 3S(s) → Sb2S3(s)

A reaction initially contains 15.7 g antimony and 17.3 g sulfur. Once the reaction has occurred as completely as possible, what mass (in g) of the excess reactant is left?

a. 4.60 g b. 11.1 g c. 6.20 g Sr . I Sr l Cl Cl 112 Ag

:

z

Ang

2 NO3112 2 2 2 M,V,--MzVz ? 8.75M 5.75M _{NO! NO} "Dilute" Vz=? 450mL * start In Q stem '45LAgnos

xfiagnojttsnosxzmoisagr-ozxo.im

. " -1148mi g.

NANNA

must Terancharge

---I

,

be _{since theres} 2Oftheme +2

-1×2=-2

& methane & Nitrous oxide

go

→ -3 ( reduced) AKA q g ft g } -oxidizing -agent O→_{t2 (oxidized)} AKA reducing ACIDS agent -Formula Has Ht - as firstelement

↳ Nitrite → _our t.no is

BinaryAaa te '

oxyacid

that contains t only2 -at- ice elements -it sous B D c A ↳ tonic Nat g 2-Nazs 15.7g 17.3g 15.7

gfbxpzt.my#bybxzlmmogbb-23=

0.64471091 MolSbzsz 17.30¥X

zzt.my#ggxzpmn%fb-2S3--

0.179837419 MOI SbzS3 1.R.

Whats the excess reactant? Sb

3_{mot 32.066gS} O.645M¥34 ,

mobjz-x.no#----6j20ugeSg

were needed , -17.3g- 6.20-- lllilginexcess

d. 1.60 g

25. Silver Nitrate reacts with Magnesium Chloride to produce Silver Chloride and

Magnesium Nitrate. If 305 grams of silver nitrate are reacted in an excess of magnesium chloride producing 23.7 grams of magnesium nitrate, what is the percent yield?

a. 17.80% b. 8.91% c. 14.39%

d. None of the above

26. Balance the following chemical equation

C4H10(l) + O2(g) → CO2(g) + H2O(l)

27. How many grams of calcium chloride are needed to prepare 71.7g of silver chloride according to the following equation?

CaCl2(aq) + 2AgNO3(aq) → Ca(NO3)2(aq) + 2AgCl(s)

a. 42.3 g b. 17.2 g c. 27.8 g d. 33.3 g ZAGNO₃ t _Mgclz

→2AgU

t MglNO3)z

305*03×164

_{?o¥¥#jzxj¥;I}

x

,Yh9i3m3§¥#

-133.2g MglNash

E

!

_,

LL

4 s

yz%

Field

-73?Igxioo%=Ino

Cit 4 H : _{10 IT :Xto} O : 2 069113 2

Cy

H ,. t 1302 → _{8 Coz t} 10h20

71.7GW

xtym.ly#glux*2t-9ak--

_27.775g

✓

_2mo#

I "

1M¥12

Oxidized

OIL

RI

-

lost

electrons

0

→ * -

more

positive

.

AKA

reducing

_agent

Reduced

-

Gain

electrons

0

→ • .

More

negative

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