Chem 116 Lecture 10
Answer: A, Na and Cl ions
Once NaCl is mixed into the solution is it no longer in the solid form, it breaks into ions
Know the difference between mass and moles
What does the par
Chem notes 9.30.08
Lecture 9 (mo)
Dispersion forces of HCl > HF
Dipole-dipole forces of HF > HCl
Boiling point HF > HCl because hydrogen bond of HF is strongest
*Dipole Dipole moment matters most in small molecules
Chem 116, Lecture 9
Sept. 30, 2008
Class Notes [HT]
Intermolecular Force Practice:
What kinds of intermolecular forces hold the following condensed phases together?
1. H2O (l)
2. CO2 (s)
3. NH3 (l)
4. CaCl2 (s)
5. C8H18 (l) Octane
7. HCl (l)
Summarizing Intermolecular forces
Weakest to strongest attractions:
- London dispersion forces: occurs with non-polar molecules, and is also weakest
attraction (when taken individually) of all and holds ALL molecules. Th
Lesson 15: Solving Vector Problems in 2 Dimensions
We can now start to solve problems involving vectors in 2 dimensions.
We will use all the ideas we've been building up as we've been studying vectors to be able to
solve these questions.
The majority of
Chem 116 Lecture #8 Notes
Summarizing Intermolecular Forces
London Dispersion forces are weakest, but depend on size of molecules so these
kind of forces dominate for large molecules
Dipole-Dipole forces are the next strongest under the Lon
Lesson 15: Magnetic Fields
We can imagine a magnetic field surrounding a magnet in much the
Did You Know?
same way that we did for electrical charges.
There are some theories in
One of the biggest differences is that electrical charges can be
Lecture 9/23/2008 (LL)
TEST: Moved to Thursday 2nd
B) CH3OH- Has the strongest dipole moment
Dipole moment has to do with where the electrons prefer to spend most of their time (on
which atom). The electrons prefer to spend time on the
Lesson 14: Magnetism History
Today we really take magnets for granted. have you ever asked yourself why they can stick to your
The history of magnetism begins with the ancient civilizations in an area known as Asia Minor
(around modern day Turkey)
Lesson 14: Vectors in Two Dimensions
Two dimensional problems are a little tougher, because we are no longer just lining up collinear vectors
and doing quick math.
Instead, we need to pay attention to how the vectors form a more complex (but not very
CHEM 116 Lecture 7 Notes (kl)
September 23, 2008
Exam changed to next Thursday
o Draw Lewis Structures Figure out shapes
o Strength of Dipole=Strength of Bond
o More Attracted to Oxygen because Oxygen has a high
Lesson 13j: Power
Remember from earlier in the course we had a formula for relating electricity to energy changing
E =qV (equation 1)
But from way back in Science 10 and Physics 20 we had a formula to determine the power as
energy is change
Lesson 13i: RC Circuits
If you have a circuit with both resistors and capacitors, you call it (not surprisingly) a RC circuit.
Because of the capacitor, the circuit will behave in a particular way.
At first, with the capacitor uncharged, DC current will
CHEM 116 LECTURE NOTES [si]
CONTINUATION OF LECTURE 5 AND LECTURE 6
Heating curves and phase diagrams
Particle level models of phase changes
Remainder of polar and nonpolar molecules learnt in chem. 115
Lesson 13h: Kirchoff's Rules
We sometimes encounter a circuit that is too complicated for simple analysis.
Maybe there is a weird mix of series and parallel, or more than one power
To deal with such complicated circuits, we use Kirchhoffs rules, i
Chem 116 Notes
A clicker question about material we covered in class last lecture
Which statement about the vapor pressure of water is correct?
A. If atmospheric pressure is 600mmHg, water will boil at about 93oC
B. Water cannot boil above 100oC (
Lesson 13g: Resistors in Series and Parallel Circuits
Any path along which electrons can flow is a circuit.
For a continuous flow of electrons, there must be a complete circuit with no gaps. A
A gap is usually an switch that can be closed to allow electro
Lesson 13f: Capacitors
Capacitors are simple devices found in electric circuits.
At their simplest, they are made up of two metal parallel plates separated
by a non-conductor called the dielectric medium. Note, sometimes the
dielectric medium is simply a
There is always some resistance in every circuit.
A circuit is always made up of some wire, so there will be some resistance there.
Even the battery has parts that offer resistance to the flow of
The only circuits that come near
Chem 116, Lecture 5
Class Notes [HT]
Which answer represents a list in order of increasing deviation from ideal gas behavior?
*Key points of Deviation from Ideal Gas Behavior*
- The greater the deviation the less ideal the gas is.
The amount of current flowing in a circuit depends, in part, on the voltage.
By increasing the voltage (maybe by using a more powerful battery) you increase the pumping
power that is moving current through the circuit.
Current flow also de
Phases Changes and Phase Diagrams
The iclicker question: pg.2
When you have two gases in two tubes and the valves open the gases move between the
The speed at which the molecules move depend on the Molecular Weight of the g
13b: Electric Current
When a conductor is connected between both terminals of a battery it forms an electric circuit.
A circuit must be a complete, unbroken loop connecting one terminal of a
battery (or other source of voltage) to the other.
A battery is
Lecture 4: Phase Changes and Phase Diagrams
o Gases in a mixture spread out until all available space is taken up.
o Each gas in a mixture behaves independently of the other.
o Each gas exerts its own pressure, called th
Until the year 1800 most people were only generating static electricity for their experiments.
They were almost exclusively using devices that would build up charges by friction.
To really make electricity useful (and not just something
IN CLASS NOTES: 09-09-08 (SI)
1. Kinetic Molecular Theory
2. Grahams Law of effusion
Conclusion from Clicker question
1. The higher the temperature, the faster the particles of a gas move
2. Increase in temperature leads to increas