Chem Test 2
SnF4
Determine the empirical formula of the following compound if a sample contains 5.28 gSn and 3.37 gF;
mole
6.02 x 10^23
0.423
A 17.5 mL sample of an acetic acid (CH3CO2H) solution required 29.6 mL of 0.250 M NaOH for neutralization. The concentration of acetic acid was __________ M.
0.0102
A 31.5 mL aliquot of HNO3 (aq) of unknown concentration was titrated with 0.0134 M NaOH (aq). It took 23.9 mL of the base to reach the endpoint of the titration. The concentration (M) of the acid was __________. 1.02 0.0051 0.0204 0.227 0.0102
79.7%
A student performs an experiment that produces 5.78 grams of silver chloride. He calculated that 7.25 grams of silver chloride should have precipitated if all of the limiting reactant reacted. What is his percent yield? 125% 20.3% 79.724% 79.7%
False
Amnomia is a strong base
(NH4)2S
Aqueous solutions of a compound did not form precipitates with Cl-, Br-, I-, SO4 2-, CO3 2-, PO4 3-, OH-, or S2-. This highly water-soluble compound produced the foul-smelling gas H2S when the solution was acidified. This compound is __________. AgNO3 Pb(NO3)2 KBr Li2CO3 (NH4)2S
0
As in As4
SnBr2 (aq) + Cu (s) → CuBr2 (aq) + Sn (s)
Based on the activity series, which one of the reactions below will occur? Pb (s) + NiI2 (aq) → PbI2 (aq) + Ni (s) SnBr2 (aq) + Cu (s) → CuBr2 (aq) + Sn (s) Mn (s) + NiCl2 (aq) → MnCl2 (aq) + Ni (s) Fe (s) + ZnCl2 (aq) → FeCl2 (aq) + Zn (s) None of the reactions will occur.
1
Br in HBrO
4
C in COCl2
46.1 amu
Calculate the formula weight of ethanol, C2H5OH.
601.93
Calculate the formula weight of the compound Ba3(PO4)2. 569.93 amu 184.30 amu 327.27 amu 601.93 amu
77.54
Calculate the percentage by mass of lead in PbCO3.
Na+ and i-
Combining aqueous solutions of BaI2 and Na2SO4 affords a precipitate of BaSO4. Which ion(s) is/are spectator ions in the reaction? Na+ and I− Ba2+ and SO42− SO42− and I− Ba2+ only Na+ only
K2CO3
Determine the empirical formula of the following compound if a sample contains 0.104 molK, 0.052 molC, and 0.156 molO;
NH2
Determine the empirical formula of the following compound if a sample contains 87.5% N and 12.5% H by mass.
61.1
How many grams of sodium chloride are there in 550.0 mL of a 1.90 M aqueous solution of sodium chloride? 122 6.11 × 104 1.05 61.1 30.5
1.31
How many moles of K+ are present in 343 mL of a 1.27 M solution of K3PO4? 0.145 1.31 11.1 0.436 3.70
1.183
How many moles of carbon dioxide are there in 52.06 g of carbon dioxide? 8.648 ×1023 1.183 6.022 × 1023 3.134 × 1025 0.8452
5.79 ×1022
How many oxygen atoms are contained in 2.74 g of Al2(SO4)3? 12 8.01 ×10−3 7.22 ×1024 6.02 ×1023 5.79 ×1022
1.08 x 10^23
How many sulfur dioxide molecules are there in 0.180 mol of sulfur dioxide? 1.08 ×1024 1.80 ×1023 1.08 ×1023 6.02 ×1024 6.02 ×1023
63.4
In a titration of 35.00 mL of 0.737 M H2SO4, __________ mL of a 0.827 M KOH solution is required for neutralization. 35.0 25.8 62.4 1.12 39.3
K2SO4
In which species does sulfur have the highest oxidation number? S8 (elemental form of sulfur) K2SO4 H2S H2SO3 SO2
7
Mn in MnO−4
-1
O in K2O2
aluminum
Of the following elements, __________ is the most easily oxidized. oxygen fluorine nitrogen aluminum gold
loss of electrons, gain of electron
Oxidation is the __________ and reduction is the __________. loss of oxygen, gain of electrons loss of electrons, gain of electrons gain of oxygen, loss of electrons gain of electrons, loss of electrons gain of oxygen, loss of mass
4
S in SO2
Ca2+,OH−
Specify what ions are present in solution upon dissolving each of the following substances in water. Ca(OH)2
H+,NO3−
Specify what ions are present in solution upon dissolving each of the following substances in water. HNO3
Zn2+,Cl−
Specify what ions are present in solution upon dissolving each of the following substances in water. ZnCl2
2NaN3(s)→2Na(s)+3N2(g)
The balanced equation for the decomposition of sodium azide is __________
2NaN3(s)→2Na(s)+3N2(g)
The balanced equation for the decomposition of sodium azide is __________. 2NaN3(s)→2Na(s)+2N2(g) 2NaN3(s)→2Na(s)+3N2(g) NaN3(s)→Na(s)+N2(g) NaN3(s)→Na(s)+N2(g)+N(g) 2NaN3(s)→Na2(s)+3N2(g)
Ca2+ (aq) + CO3 2- (aq) → CaCO3 (s)
The balanced net ionic equation for precipitation of CaCO3 when aqueous solutions of Na2CO3 and CaCl2 are mixed is __________. Na+ (aq) + Cl- (aq) → NaCl (aq) 2Na+ (aq) + CO3 2- (aq) → Na2CO3 (aq) 2Na+ (aq) + 2Cl- (aq) → 2NaCl (aq) Na2CO3 (aq) + CaCl2 (aq) → 2NaCl (aq) + CaCO3 (s) Ca2+ (aq) + CO3 2- (aq) → CaCO3 (s)
2HNO3 (aq) + Sr(OH)2 (aq) → 2H2O (l) + Sr(NO3)2 (aq)
The balanced reaction between aqueous nitric acid and aqueous strontium hydroxide is __________. HNO3 (aq) + Sr(OH)2 (aq) → H2O (l) + Sr(NO3)2 (aq) HNO3 (aq) + Sr(OH)2 (aq) → Sr(NO3)2 (aq) + H2 (g) 2HNO3 (aq) + Sr(OH)2 (aq) → Sr(NO3)2 (aq) + 2H2 (g) 2HNO3 (aq) + Sr(OH)2 (aq) → 2H2O (l) + Sr(NO3)2 (aq) HNO3 (aq) + SrOH (aq) → H2O (l) + SrNO3 (aq)
123.11
The formula of nitrobenzene is C6H5NO2. The molecular weight of this compound is __________ amu.
123.11
The formula of nitrobenzene is C6H5NO2. The molecular weight of this compound is __________ amu. 109.10 3.06 107.11 43.03 123.11
132
The formula weight of ammonium sulfate ((NH4)2SO4), rounded to the nearest integer, is __________ amu.
H+ (aq) + OH- (aq) → H2O (l)
The net ionic equation for the reaction between aqueous nitric acid and aqueous sodium hydroxide is __________. H+ (aq) + OH- (aq) → H2O (l) HNO3 (aq) + NaOH (aq) → NaNO3 (aq) + H2O (l) H+ (aq) + Na+ (aq) +OH- (aq) → H2O (l) + Na+ (aq) HNO3 (aq) + OH- (aq) → NO3 - (aq) + H2O (l) H+ (aq) + HNO3 (aq) + 2OH- (aq) → 2H2O (l) + NO3 - (aq)
a molecular compound and a strong electrolyte
The reaction between strontium hydroxide and chloric acid produces __________. a molecular compound and a strong electrolyte two molecular compounds two strong electrolytes a molecular compound and a weak electrolyte two weak electrolytes
1.00 x 10^24
The total number of atoms in 0.111 mol of Fe(CO)3(PH3)2 is __________. 1.00 ×1024 2.76 ×10−24 1.67 4.46 ×1021 15.0
100
There are __________ hydrogen atoms in 25 molecules of C4H4S2. 3.8 ×1024 1.5 ×1025 100 25 6.0 ×1025
0.752 and 0.376
What are the respective concentrations (M) of Na+ and SO42− afforded by dissolving 0.500 mol Na2SO4 in water and diluting to 1.33 L? 0.376 and 0.752 0.665 and 0.665 0.665 and 1.33 0.752 and 0.376 1.33 and 0.665
SiO2
What is the chemical formula for quartz?
148.3 amu
What is the formula weight of Mg(NO3)2?
C6H12O6
What is the molecular formula of a compound with a molar mass of 180.16 grams/mole and the empirical formula CH2O? C2H6O2 C1.5H3O1.5 C6H12O6 C2H4O
1.23
What mass (g) of AgBr is formed when 35.5 mL of 0.184 M AgNO3 is treated with an excess of aqueous hydrobromic acid? 1.23 34.5 188 1.44 53.6
375
What volume (mL) of 7.48 × 10-2 M perchloric acid can be neutralized with 115 mL of 0.244 M sodium hydroxide? 8.60 125 375 750 188
29.3
What volume (mL) of a concentrated solution of sodium hydroxide (6.00 M) must be diluted to 200.0 mL to make a 0.880 M solution of sodium hydroxide? 29.3 2.64 176 26.4 50.0
129
What volume (ml) of a 3.45 M lead nitrate solution must be diluted to 450.0 ml to make a 0.990 M solution of lead nitrate? 56 45 129 109 101
NiBr2 and AgNO3
When aqueous solutions of __________ are mixed, a precipitate forms. NaI and KBr K2SO4 and CrCl3 KOH and Ba(NO3)2 Li2CO3 and CsI NiBr2 and AgNO3
2
When the following equation is balanced, the coefficient of H2O is __________. Ca(s)+H2O(l)→Ca(OH)2(aq)+H2(g)
3
When the following equation is balanced, the coefficient of H2S is __________. FeCl3(aq)+H2S(g)→Fe2S3(s)+HCl(aq)
MgSO3
Which compound has the atom with the highest oxidation number? MgSO3 NH4Cl Al(NO2)3 Na3N CaS
Li2Co3
Which compound has the highest percentage composition of oxygen? Li2CO3 KNO3 La2O3 Al(OH)3
reactants
____appear on the left side of the equation
C
Which element is oxidized in this reaction? Fe2O3+3CO→2Fe+3CO2
Sr(OH)2, KOH, NaOH, Ba(OH)2
Which hydroxides are strong bases? Sr(OH)2 KOH NaOH Ba(OH)2 KOH, Ba(OH)2 KOH, NaOH KOH, NaOH, Ba(OH)2 Sr(OH)2, KOH, NaOH, Ba(OH)2 None of these is a strong base.
129 mL of 0.145M solution of KCl
Which solution has the same number of moles of KCl as 75.00 mL of 0.250M solution of KCl? 129 mL of 0.145M solution of KCl 25.0 mL of 0.175M solution of KCl 20.0 mL of 0.200M solution of KCl 50.0 mL of 0.125M solution of KCl 100 mL of 0.0500M solution of KCl
none of the above
With which of the following will the ammonium ion form an insoluble salt? carbonate sulfate sulfate and carbonate chloride none of the above
products
______ appear on the right side of the equation
participation reactions
cations and anions come together to form an insoluble ionic compound
oxidTION reaction
electrons are transferred from one recant to another
reduction
gain of electrons
neutralization reaction
h+ ions and OH- ions come together to from h20 molecules
k2So3
hat is the empirical formula of a compound that contains 49.4% K, 20.3% S, and 30.3% O by mass? K2SO3 KSO4 KSO3 KSO2 K2SO4
132
he formula weight of ammonium sulfate ((NH4)2SO4), rounded to the nearest integer, is __________ amu. 132 116 118 100 264
acids
ionize in aqueous solutions to form H + ions, combination of H+and an anion
oxidation
loss of electrons
nonelectrolyte
may dissolve in water but it doesn't associate into ions when it does so
molarity
measure concentration in a solution
62.4
n a titration of 35.00 mL of 0.737 M H2SO4, __________ mL of a 0.827 M KOH solution is required for neutralization. 35.0 25.8 62.4 1.12 39.3
decomposition reaction
one substance breaks down into two or more substances
combustion reaction
rapid reactions that produce a flame. involve oxygen as a reactant
bases
react with H+ ions. combination of a cation and OH-
neutralization reactions
reactions between an acid and a base
precipitate
salt falling from a solution like snow from the key
electrolyte
substance that dissociates into ions when dissolved in water
molecular weight
sum of the atomic weight of the atoms in a molecule
molar mass
the mass of 1 mol of a substance
theoretical yeild
the maximum amount of product that can be made
limiting reactant
the reactant present in the smallest stoichmetric amount
formula weight
the sum of the atomic weights of atoms in a chemical formula
combination reaction
two or more substances react to form one product