Part I Instructions: Match the vocabulary word with the letter of its definition.
1. Oxidizing Agent 9. Diffusion
2. Reducing Agent 10. Effusion
3. Molarity 11. Kinetic Energy
4. Gravimetric Analysis 12. Potential Energy
5. Volumetric Analysis 13. Heat
6. Pressure 14. Endothermic
7. Molar Gas Constant (R) 15. Exothermic
8. Partial Pressure
A. The process whereby a gas spreads out through another gas to occupy the space uniformly.
B. A type of quantitative analysis in which the amount of a species in a material is determined by converting the species to a product that can be isolated and completely and weighed.
C. The moles of solute dissolved in one liter of solution.
D. The process in which a gas flows through a small hole in a container.
E. The energy an object has by virtue of its position in a field of force.
F. A species that oxidizes another species; it is itself reduced.
G. A chemical reaction or physical change in which heat is absorbed (q is positive).
H. The force exerted per unit area of surface.
I. A species that reduces another species; it is itself oxidized.
J. A method of analysis based on titration.
K. An energy transfer into or out of a thermodynamic system that results from a temperature difference between the system and its surroundings.
L. A chemical reaction or physical change in which heat is evolved (q is negative).
M. The pressure exerted by a particular gas in a mixture.
N. The energy associated with an object by virtue of its motion.
O. The constant of proportionality relating the molar volume of a gas to T/P.
Short Answer: For the following short answer questions. Please provide the correct answer.
Where appropriate,please show all mathematical calculations and include all units.
1. When calcium hydroxide is reacted with sodium carbonate (both in aqueous solution), solid calcium carbonate and aqueous sodium hydroxide arc I ormed.
For this precipitation reaction, write the balanced molecular, complete ionic, and net ionic equation.
Molecular:
Complete Ionic:
Net Ionic:
2. Balance the following oxidation-reduction reaction by the half-reaction method. 2AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2Ag(s)
3. Magnesium burns in air to produce magnesium oxide, MgO, and Magnesium nitride, Mg3N2. Magnesium nitride reacts with water to give ammonia.
Mg3N2(s) + 6H2O → 3Mg (OH)2(s) + 2NH3 (g)
What volume of ammonia gas at 24oC and 753 mmHg will be produced from 3.93 g of magnesium nitride?
4. For a molecule to leave the moon, it must reach the escape velocity of the moon, which is 2.37 km/s. The average daytime temperature of the moon's surface is 92 degrees Celsius. What is the rms speed (in m/s) of a hydrogen molecule (H2) at this temperature? Will the H2 molecule be able to leave the moon?
5. Ammonia burns in the presence of a copper catalyst to form nitrogen gas.
4NH3 (g) + 3O2 (g) → 2N2 (g) + 6H2O (g) ΔH = 1267 kJ
What is the enthalpy change to burn 35.8 g of ammonia?
6. Coal gasification converts coal into a combustible mixture of carbon monoxide and hydrogen, called coal gas, In a gasifier:
H2O (I) + C (s) → CO (g) + H2 (g)
Calculate the standard enthalpy change for this reaction from the following chemical equations:
2C (s) + 02 (g) → 2C0 (g) ΔHo = -222 kJ
2H2 (g) + O2 (g) → 2H2O (g) ΔHo = -484 kJ
H2O (I) → H20 (g) ΔHo = +44 kJ