Chem123 On-Line Quizzes

Announcement Area

[NEW] Some of you have done the quizzes before June 15's announcement by Prof. Le Roy. If your mark were not perfect, I have removed them so that you can re-write the quiz. If they were 99/99, I have kept them.
When you write quiz 7, all marks for quiz 1 to 6 are displayed to you. If you see the mark as -1, it indicates that you have to write that quiz again.
Due to massive SPAM and virus, please specify Chem120 Quiz as your Subject when you send a e-mail. Otherwise, it may not reach Prof. Chieh.
Deadlines for quizzes set a timed schedule for your learning, and we hope you acquire the skills gradually to build a strong solid foundation. However, we have different learning styles and you may write any of the quizzes anytime before the deadline.
Quiz 1 2 3 4 5 6 7 8 9 Deadline 01/23 01/30 02/06 02/13 02/27 03/12 03/19 03/26 04/02

Quizzes are available till 4:00 pm on the deadline indicated for each quiz. Please don't wait till the last day to write your quiz. Deadlines cannot be extended. If you do not write it before the deadline, that quiz mark will automatically be zero (0).

Instruction for Writing Quizzes

Marks are assigned according to performances, which include writing quizzes. Marks are assigned with certain rules, not just providing answers.

Each time you click the mouse, the system detects your intention. Clicking the Submitting Button is counted as an attempt by the system, and losing marks due to double clicking the Submitting Button is a fair price for a lesson early in life.

After a quiz, assess your strength and weakness. Please find ways to improve your learning rather than trying to maximize your quiz mark.
Eight best quiz marks will be used for the average from the nine (9) quizzes.
Please be patient during your quiz. The information goes through a very complicated process over the Internet. If you have difficulty with a quiz, please immediately E-mail cchieh@uwaterloo.ca. and tell him your difficulty. Please include your ID number regarding quiz problems.
Questions and Answers on Quizzes summarize difficulties some students have had. Read it to avoid the same difficulties.
You may do a quiz a few time if you DO NOT Submit it For Marking by closing the quiz Window.

Quizzes

Intermolecular forces January 23
- Phases
- Heating curve
- Intermolecular forces
- Phase diagrams
- The liquid state
- The Clausius-Clapeyron Equation
The solid state January 30
- the Solid state
- Closest packings of spheres as models of crystal structures: fcc, bcc, and simple cubic.
- Metal structures
- Tetrahedral and octahedral sites in packing of spheres
- X-rays and Bragg equztion
Chemical kinetics - rate laws February 6
- Chemical kinetics - factors affecting reaction rates
- Rates and concentrations - effects of concentrations on rates
- Rate laws - differential rate laws
- Rate laws - integrated rate laws
Chemical kinetics - mechanism and activation energy February 13
- Elementary steps in mechanism (Chemical kinetics)
- Rate and mechanism (Deriving rate laws from a proposed mechanism)
- Steady-state approximation (for deriving rate laws)
- Chain reaction (and mechanism)
- Activation energy (temperature effect on rate)
Chemical equilibrium Reading week Feb. 16-20; Midterm Test on Feb. 25
February 27
Notes: The "<=>" is used in chemical equations to represent reversible reactions. Use 1.23e-5 to mean 1.23x10^-5 for numerical answers.
- The Massaction law
- Equilibria and systems
- Chemical equilibrium
- Equilibrium calculations
- Heterogeneous equilibria
Acids and bases March 12
- Acids and bases - Definitions of acids and bases by Arrhenius, Bronsted-Lowry, and Lewis; conjugate acid-base pair; non aqueous solvent;
- Strong acids & bases - autoionization, leveling effect, the pH scale.
- Ka Kb = Kw - pH and pOH relationship
Acid base equilibria March 19
- Weak acids and bases
- K_a, K_b, and K_w relationships.
- Calculate pH when two equilibria are present (exact pH calculation).
- Dissociation fraction or percentage of dissociation.
- Polyprotic acids - equilibria of
- Titration problems - plotting the titration curve, including the buffer and hydrolysis (hydration) problems.
Heterogeneous equilibrium March 26
- Insoluble salts - expressions for solubility products, K_sp, and molar solubilities of salts
- Common ion effect - estimate concentration of common ions in solution, and solubility of salts as a consequence of the common ions
- Ion separation - estimate ion concentrations of one ion type while another ion type begins to form a precipitate
- Metal hydroxides
- Metal complexes
Electrochemistry April 2
- Galvanic cells - cell components, construction, combind to form batteries
- Oxidation states - redox reactions, half reactions
- Half reactions - balance redox reactions using half reactions
- Nernst equation - apply the Nernst equation to solve various problems, also apply the following formulas: DE^o = (R T / n F) ln K_c
  DG^o = - n F E^o
- Electrolysis - calculate the quantities in electrolysis