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. 66. 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 AcidI 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 H2Otoooo
0.650 MOI x 11¥ x¥0
⇐1M01C¥zHi
,smog
114.33g
↳ 2 nonmetalsprefixt 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 BEATYE
= 4.872 M- MOI IL 0.374M -→0.15 . 0.374 - Xmotx # 0.0561 Mol 141×74-5519 O.# lmolkllB.
-4.18g
↳ AKA Molarity12.82g
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. Balanceequation
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 I Cl Cl 112 Ag
:
zAng
2 NO3112 2 2 2 M,V,--MzVz ? 8.75M 5.75M NO! NO "Dilute" Vz=? 450mL * start In Q stem -45LAgnosxfiagnojttsnosxzmoisagr-ozxo.im
. " -1148mi &NAMMA
must Terancharge ---I
,
be since theres 2Oftheme +2
-1×2=-2
& methane & Nitrous oxide
go
→ -3 ( reduced) AKA q g ft q } -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 →ON B D c A ↳ tonic Nat g 2-Nazs 15.7g 17.3g 15.79¥ ,zt.my#bybxzlmmogbb-23=
0.64471091 MolSbzsz L-R. 17.3gfxzzt.my#ggxzpmnoolSgb-2S3--
0.179837419 MOI Sbzs3Whats the excess reactant? S!
✓
3m
321646
⇐ 6.20gS were needed, g. 645 MolSb2S3X,mo,gbzST
× lMOIS or used -17.3g- 6.20--lll.to/nexcess-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