1. A compound containing only nitrogen and oxygen is 63.65% nitrogen
by mass, and the remainder of the mass is due to oxygen. What is the empirical
formula of this compound?
|a) N2O||b) NO||c) NO2||d) NO3||e) N2O5|
2. Oxygen reacts with nitrogen monoxide to form nitrogen dioxide. The chemical equation for the reaction is
2NO(g) + O2(g) ----------> 2NO2(g)
If 18.784 g NO and 13.215 g O2 are present in a closed tank and they react as described by the equation above, what is the limiting reactant (also called limiting reagent) and what mass of nitrogen dioxide will be formed?
a) NO is the limiting reagent and 11.185 g NO2 will be formed.
b) NO is the limiting reagent and 15.973 g NO2 will be formed.
c) NO is the limiting reagent and 28.800 g NO2 will be formed.
d) O2 is the limiting reagent and 15.973 g NO2 will be formed.
e) O2 is the limiting reagent and 28.800 g NO2 will be formed.
3. A sample of a gas is confined in a cylinder under a pressure of 3.182 atm at a temperature of 15.11 C. Initially, the volume of the gas is 9.162 L. If the pressure on the gas is increased to 6.741 atm and the temperature does not change, what will the new volume of the gas be?
|a) 2.181 L||b) 4.325 L||c) 6.199 L|
|d) 7.244 L||e) 8.917 L|
|a) 5.21 atm||b) 3.87 atm||c) 2.45 atm|
|d) 1.30 atm||e) 0.55 atm|
|a) 1.117 g / L||b) 3.500 g / L||c) 4.992 g / L|
|d) 6.105 g / L||e) 7.051 g / L|
C3H8 + O2 ----------> CO2 + H2O
If your set of coefficients happens to have a common factor other than one, divide all coefficients by the greatest common factor to get the chemical equation in lowest terms. When the equation is balanced using integers in lowest terms, the coefficient of O2 is
|a) 1||b) 2||c) 3||d) 4||e) 5|
7. The reaction
CaCl2(aq) + Na2CO3(aq) ----------> CaCO3(s) + 2NaCl(aq)
is an example of what kind of reaction?
|a) metathesis||b) displacement||c) decomposition|
|d) combination||e) combustion|
|a) Pb(NO3)2||b) Ba(C2H3O2)2||c) CaCl2|
|d) AgCl||e) NaBr|
|a) sodium phosphate||b) silver(I) nitrate|
|c) potassium carbonate||d) calcium nitrate|
|e) sodium acetate|
|a) Only K+||b) Only SO42-|
|c) Ca2+ and SO42-||d) K+ and Cl-|
|e) K+ , Ca2+ , Cl- , and SO42-|
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Last modified: Thursday June 18, 1998