CEM 141

Exam 3 Study Guide



Chapter 1
Concept checklist:
1. Unit conversion.
2. Define Density and be able to do calculations involving it.

End of chapter problems 43,45,47,55,60,76

Chapter 3:

Vocabulary Checklist:

Reactant, product, combustion reaction, decomposition reaction, combination reaction,  limiting reagent, excess reagent

Concept checklist:
1. Balance any chemical equation.
2. Define and recognize a combustion reaction, decomposition reaction and a combination reaction.
3. Given amounts of reactants, determine the limiting reagent, excess reagents and calculate theoretical yields as well as percent yield.

 Suggested End-of-chapter Problems:
1,9,11,13,17,19,55,59,63,67,69,75,79,89 

Chapter 5:

Vocabulary Checklist:
energy ;  system ;  surroundings ;  internal energy ; heat ; endothermic ; exothermic ; work ; state function ; enthalpy ; calorimeter ; heat capacity ; specific heat

Concept checklist:

1. Explain the difference between kinetic and potential energy and how we can change back and forth between them.
2. Understand the difference between the system and the surroundings and be able to define it for each situation.
3. Explain what pressure volume work is.
4. Explain the first law of thermodynamics.
5. Know the sign convention for work, heat and enthalpy change.
6. Perform calculations involving heat capacity and specific heat.
7. Explain Hess's law and how it allows us to determine
DHrxn for a reaction.
8. What are the conditions of standard state.
9. Define and derive the standard enthalpy of formation for any substance.

Suggested End-of-chapter Problems:

Chpt 5: 1,11,17,25,31,35,37, 49,53,63,67,75,77,83,87,93

Suggested Websites:

The Energy Content of Foods
A simple experiment you can actually do at home to determine energy content of nuts and other common foods.
Thermochemistry
This slide show briefly covers a number of topics in graphical format, including exothermic and endothermic processes, Hess's law, standard enthalpy of formation, and calorimetry.
A Simple Definition of the Laws of Thermodynamics
You can't win; you can't break even; and you can't get out of the game! This link provides an extensive but easy to understand discussion of the Laws of Thermodynamics, including some historical perspective.

Hess's Law Problems
This site gives you several balanced chemical equations with reaction enthalpies and asks you to calculate the enthalpy of some other reaction.

Chapter 10:

Vocabulary checklist:
Pressure; barometer; Standard Temperature and Pressure (STP); Mole Fraction; diffusion, effusion

Concept Checklist:
1. Explain pressure (with simple words) and how it is measured.
2. Understand the four measured properties of a gas and how they are related.
3. Manipulate and do all sorts of problems using the ideal gas gas (density, MW included)
4. Know the conditions for STP
5. Be able to explain Dalton's Law of partial pressures and do appropriate calculations.
6. Do appropriate calculations using mole fraction as a unit of concentration
7. Give major points of Kinetic Molecular Theory and explain how the ideal gas law 'follows' it.
8. Do calculations and understand the concept of Grahams law and RMS velocity.
9. Understand Why gases do not behave ideally and why the Van der Waal's equation is more accurate.

Suggested End-of-chapter Problems:

Chpt 10: 1, 4, 9, 13,17, 21,25,29,35, 41, 43,,45,47,49, 55,57,59, 65, 73,85, 93, 105

Chapter 4:

Vocabulary Checklist:

solution, solute, solvent, electrolyte, molarity, precipitation reactions, spectator ion, oxidation state, reduction, Activity strength, indicator, titration, equivalence point, end point

Concept checklist:

1. Explain what happens when a strong and weak electrolytes do in water.
2. Calculate the concentration of a solution and use it in quantitative calculations.
3. Predict precipitation reaction products.
4. Know the solubility rules as presented in class.
5. Write the complete and net ionic equations of aqueous reactions.
6. Know the six strong acids: HCl, HBr, HI, HNO3, H2SO4, HClO
4.
7. Know the strong bases.
8. Recognize, predict products of, and balance neutralization reactions.
9. Recognize, predict products of, and balance oxidation/reduction reactions.
10. Do calculations involving aqueous solutions.
11. Know all the major terms of a titration and what one is.
12. Know many examples of aqueous reactions in the ‘real world’.

Suggested End-of-chapter Problems: 3,5,11,15,19,27,29,39,49,53,57,59,63,65,67,71,85,98

Last Updated 28 Jan 07