Page 229 - Chemistry eBook

may require the use of the 2011 Edi3tion Reference Tables for Physical Setting/Chemistry.
saturated solution at 50.°C? [1]
51 What is the mass of KNO3(s) that must dissolve in 100. grams of water to form a saturated solution at 50.°C? [1]
Base your answers to questions 52 through 55 on the information below. Base your answers to questions 52 through 55 on the information below.
The reaction between alumSainmupmle aRnedgeannts aQquesotuiosnsolution of copper(II) sulfate The reaction between aluminum and an aqueous solution of copper(II) sulfate is
represented by the unbalanced equation below. represented by the unbalanced equation below.
Al(s) 􏰀 CuSO (aq) → Al (SO ) (aq) 􏰀 Cu(s) 44 224343
Al(s) 􏰀 CuSO (aq) → Al (SO ) (aq) 􏰀 Cu(s) 52 Identify the type of chemical reaction represented by the equation. [1]
52 Identify the type of chemical reaction represented by the equation. [1] 53 Balance the equation in your answer booklet, using the smallest whole-number
coefficients. [1]
53 Balance the equation in your answer booklet, using the smallest whole-numb 54 Explain why the equation represents a chemical change. [1]
coefficients. [1]
55 Determine the total mass of Cu produced when 1.08 grams of Al reacts completely with
9.58 grams of CuSO to produce 6.85 grams of Al (SO ) . [1] 4243
54 Explain why the equation represents a chemical change. [1]
June 2012 #53
55 DeteBramseiynoeurtahneswteorstatol qmueasstisonos f56Ctuhropurgoh d59uocnetdhewinhfoernma1ti.o0n8beglorwa.ms of Al reacts completely wi
9.58 grams of CuSO4 to produce 6.85 grams of Al2(SO4)3. [1]
A total of 1.4 moles of sodium nitrate is dissolved in enough water to make 2.0 liters of
an aqueous solution. The gram-formula mass of sodium nitrate is 85 grams per mole.
56 Write the chemical formula for the solute in the solution. [1]
2Al + 3CuSO Al (SO ) + 3Cu
Base your answers to questions 56 through 59 on the information below.
Answer
Explanation: 4 2 4 3
57 Showanumericalsetupforcalculatingthemassofthesoluteusedtomakethesolution. [1]
1. Set up a chart:
A total of 1.4 enough water to make 2.0 liters 58Coeressuretotheboilingpointof
moles o
Element
mpare the
f sodium nitra
LEFT SIDE: Al + CuSO boiling point of t4h
te is dissolved in
RIGHT SIDE: Al (SO ) + Cu solution at2 sta4n3dard p
oOAlna.tTstahned
a1rgdrparmess-ufroer.m[1u]l
2mass of sodium
Cu
1
1
S
1
1x 3 = 3
mical f
O
rmula for the
4
1
solute in the sol
4 x 3 = 12
an aqueous soluHti a nitrate is 85 grams per mole. 2
59 Determine the molarity of the solution. [ ]
56 Write the che o ution. [1]
2. Add a coefficient of 2 to Al, making it 2Al.
Now both sides of the equation have 2 Al.
2Al + CuSO Al (SO ) + Cu
57 Showanumericalsetupforcalculatingthemassofthesoluteusedtomakethesolution. [
Flip to the next card for the continuation.
Al
4243 1x 2 = 2
2
58 Compare the boiling point of the solution at standard pressure to the boiling point
H2O at standard pressure. [1]
P.S./Chem.–June ’12
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UNIT 6: MATH IN CHEMISTRY © 228