Unit 6

On completion of the unit you should be able to:

1. balance chemical equations.
2. interpret balanced equations in terms of moles, mass units and number of particles.
3. given the number of moles (or mass or number of particles) of one substance calculate the number of moles ( or mass or number of particles) of another substance in the balanced equation.
4. define limiting and excess reactants.
5. identify the following types of reactions:

  • synthesis
  • decomposition
  • combustion
  • single-replacement
  • double-replacement
  • neutralization

6. define endothermic and exothermic reactions.
7. define acids and bases.

CHEMICAL REACTIONS
6.1 Law of conservation of energy
6.2 Chemical reactions: Law of conservation of mass
Reading: Hebden – page 105-106
6.3 Balancing chemical equations
Reading: Hebden – page 107-112
6.4 What is an aqueous solution?

Dissolving NaCl (1st video)
NaCl (s) Na+ (aq) + Cl (aq)

Dissolving NaCl (2nd video)
NaCl (s) Na+ (aq) + Cl (aq)

Dissolving copper(II) chloride
CuCl2 (s) Cu+2 (aq) + 2 Cl (aq)
6.5 Types of Reactions
Five major classes of chemical reactions

  1. Combination or Synthesis reactions
  2. Decomposition Reactions
  3. Single-replacement reactions
  4. Double-replacement reactions
  5. Combustion reactions

SUMMARY
Demonstrations of the five major classes of chemical reactions

    • Synthesis or Combination
      Cu (s) + S (g) CuS (s)
    • Decomposition
      Ca(OH)2 (s) CaO (s) + H2O (g)
    • Single Replacement
      2 Al (s) + Fe2O3 (s) 2 Fe(s) + Al2O3 (s)
    • Double Replacement
      KI (aq) + Hg2(NO3)2 (aq) KNO3 (aq) + HgI (s)
    • Combustion
      CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O (l)
Reading: Hebden – page 114-118
6.6 Endothermic and exothermic reactions
Bill Nye The Science Guy on Chemical Reactions
6.7 Acids and bases

PROBLEMS:
Balance chemical equations
Classify and balance chemical equations
Predict and balance chemical equations

Download the Video Player

Video player interviews:
WED, NOV 29, 2017

Place: SW3 4092 (Rosamaria's office)
Duration: ~ 10-12 min
9:30 - Mark
9:45 - Sam
10:00 - Kade
10:15 - Raphael
10:30 - Jordan
10:45 - Drew
11:00 - Jack
11:15 - Dannicah
11:30 - Nick
11:45 - Em
12:00 (noon) - Jon
12:15 - Sean
12:30 - Justin
12:45 - Victor
********************

Windows version
Mac version

If you have problems with the video player, email Matt at mfong[at]ece.ubc.ca

LAB INSTRUCTORS

Bob Bower SW3-4092

Office hours are posted on the office door.

Got an Android device? Track your grades with My Grade Tracker. It's a FREE app!


: : : : : : : : : : : :

: : : : : : : : : : : :