Semester 2 Final Chemistry Exam Practice Test 2013-2014
1.
Ammonia is formed from 1 Nitrogen and 3 Hydrogen atoms. (Review 8.3 Red Book)
a. Draw the correct Lewis Structure for Ammonia.
b. Is Ammonia polar or non-polar?
2. Balanced Equations: (Review 9.1 & 9.2)
PCl3
a. Write and balance the following equation: P + Cl2
b. Is the equation above a synthesis, single replacement, double replacement or
decomposition reaction?
c. Write and balance the following equation: KOH + H2SO4
K2SO4 + H2O
d. Is the equation above a synthesis, single replacement, double replacement or
decomposition reaction?
3. Net Ionic Equations: for the following equation provide the balanced equation, full ionic
equation and net ionic equation: MgCl2 + AgNO3
Mg(NO3)2 + AgCl (Review 9.3)
a. Balanced Equation
b. Full Ionic Equation
c. Net Ionic Equation
4. What is the empirical formula of a compound that contains 26.6% K, 35.4% Cr and
38.0% O? (Review 10.4)
5. The reaction between 25.0 g of solid white phosphorus (P4) and 50.0 g of oxygen (O2)
produces solid tetraphosphorus decoxide (P4O10). In a lab experiment you obtained 56.6
g of P4O10.
a. Write the balanced equation
b. Determine the limiting reactant.
c. Determine the theoretical yield in grams of tetraphosphorus decoxide.
d. Determine the percent yield of tetraphosphorus decoxide.
e. Determine the amount (in grams) of excess reactant
6. If 400.0 cm3 of oxygen are collected over water at 20.0 oC, and the atmospheric
pressure is 9.70 x 104 Pa, what would the volume of the dry gas be at STP? Vapor
Pressure of water at 260.0o C is 2.30 kPa.
7.
If 0.850 grams of hydrogen (H2) are produced by a reaction, what volume in cubic
decimeters will the gas occupy if its collected over water at 23.0 oC and 1.0 x 105 Pa.
Water vapor at 23.0 oC is 2.80 kPa.
8. If 10.0 grams of Na2O2 react with water to produce NaOH and O2, how many cm3 of O2
are produced at 20.0oC and 110.0 kPa?
Na2O + H2O
NaOH + O2
9. If 15,000 cm3 of ethane gas (C2H6) at STP are burned completely to form CO2 and
water, what volume in cm3 of O2 are required?
C2H6 + O2
CO2 + H2O
10. What is Avogadro’s number?