Practice Exam 1
d 1.
What is the correct formula for the carbonate ion? (a) CH3COO(b) Cl(c) CO22(d) CO32(e) (COO-)2
c 2.
What is the name of Fe(OH)3? (a) (b) (c) iron hydroxide iron trihydroxide iron (III) hydroxide (d) (e) iron (II) hydroxide none of these
d 3.
From the following ionic compounds, choose the name-formula pair that is not correctly matched. (a) (b) (c) (d) (e) sodium sulfide ammonium nitrate zinc hydroxide sodium sulfate calcium oxide Na2S NH4NO3 Zn(OH)2 Na2SO3 CaO
b 4.
How many atoms of hydrogen are in 1.00 mole of water? (a) (b) (c) 6.02 x 1023 atoms 1.20 x 1024 atoms 1.81 x 1024 atoms (d) ( e) 2.41 x 1024 atoms 3.01 x 1023 atoms
a 5.
How many atoms of carbon are present in 34.5 g of caffeine, C8H10N4O2? (a) 8.57 x 1023 atoms (b) 2.68 x 1025 atoms (d) 2.09 x 1023 atoms (e) 4.83 x 1023 atoms (c) 1.08 x 1024 atoms
d 6.
What is the percent by mass of sulfur in Al2(SO4)3? (a) 9.38% (b) 18.8% (c) 24.6% (d) 28.1% (e) 35.4%
d 7.
What is the empirical formula for a compound containing 68.3% lead, 10.6% sulfur and the remainder oxygen? (a) PbSO2 (b) PbSO3 (c) PbS2O3 (d) PbSO4 (e) Pb2SO4
d 8.
A compound is known to contain only carbon, hydrogen, and oxygen. If the complete combustion of a 0.150-g sample of this compound produces 0.225 g of CO2 and 0.0614 g of H2O, what is the empirical formula of this compound? (a) C3H4 (b) CH4O (c) C3HO3 (d) C3H4O3 (e) C5H7O5
b 9.
A compound contains, by mass, 87.5% nitrogen and 12.5% hydrogen. Its molecular weight is found to be 32 g/mol. What is its molecular formula? (a) N2H6 (b) N2H4 (c) N2H5 (d) NH3 (e) NH2
e 10.
Balance the following equation with the smallest whole number coefficients. What is the coefficient for O2 in the balanced equation? C4H10 + O2 CO2 + H2O (a) 9 (b) 5 (c) 15 (d) 6 (e) 13
b 11.
The reaction of a hydrocarbon with oxygen to produce CO2 and water is called complete combustion. Write the balanced reaction for the complete combustion of heptane,
What is the correct formula for the carbonate ion? (a) CH3COO(b) Cl(c) CO22(d) CO32(e) (COO-)2
c 2.
What is the name of Fe(OH)3? (a) (b) (c) iron hydroxide iron trihydroxide iron (III) hydroxide (d) (e) iron (II) hydroxide none of these
d 3.
From the following ionic compounds, choose the name-formula pair that is not correctly matched. (a) (b) (c) (d) (e) sodium sulfide ammonium nitrate zinc hydroxide sodium sulfate calcium oxide Na2S NH4NO3 Zn(OH)2 Na2SO3 CaO
b 4.
How many atoms of hydrogen are in 1.00 mole of water? (a) (b) (c) 6.02 x 1023 atoms 1.20 x 1024 atoms 1.81 x 1024 atoms (d) ( e) 2.41 x 1024 atoms 3.01 x 1023 atoms
a 5.
How many atoms of carbon are present in 34.5 g of caffeine, C8H10N4O2? (a) 8.57 x 1023 atoms (b) 2.68 x 1025 atoms (d) 2.09 x 1023 atoms (e) 4.83 x 1023 atoms (c) 1.08 x 1024 atoms
d 6.
What is the percent by mass of sulfur in Al2(SO4)3? (a) 9.38% (b) 18.8% (c) 24.6% (d) 28.1% (e) 35.4%
d 7.
What is the empirical formula for a compound containing 68.3% lead, 10.6% sulfur and the remainder oxygen? (a) PbSO2 (b) PbSO3 (c) PbS2O3 (d) PbSO4 (e) Pb2SO4
d 8.
A compound is known to contain only carbon, hydrogen, and oxygen. If the complete combustion of a 0.150-g sample of this compound produces 0.225 g of CO2 and 0.0614 g of H2O, what is the empirical formula of this compound? (a) C3H4 (b) CH4O (c) C3HO3 (d) C3H4O3 (e) C5H7O5
b 9.
A compound contains, by mass, 87.5% nitrogen and 12.5% hydrogen. Its molecular weight is found to be 32 g/mol. What is its molecular formula? (a) N2H6 (b) N2H4 (c) N2H5 (d) NH3 (e) NH2
e 10.
Balance the following equation with the smallest whole number coefficients. What is the coefficient for O2 in the balanced equation? C4H10 + O2 CO2 + H2O (a) 9 (b) 5 (c) 15 (d) 6 (e) 13
b 11.
The reaction of a hydrocarbon with oxygen to produce CO2 and water is called complete combustion. Write the balanced reaction for the complete combustion of heptane,