For the student who missed the class, you must complete Chapter 2 Review Questions on page 56 to 57, Question #9 through #14.
Chapter 2
Question #9 (page 56):
Derive relationship: Density ∝ MW (gas molecular weight) at STP
……..
Density = Mass / Volume, PV=nRT, n = Mass / MW
PV=nRT → n/V = P/RT
n/V = (Mass / MW ) * (1/V ) = (Mass / V) * (1/MW ) = Density / MW
n/V = P/RT = Density / MW
Density = (P/RT ) * (MW)
For all five gases, the P and T are the same, i.e. (P/RT ) is a constant, at STP (273.15 K; 1 atm or 760 Torr),
Density ∝ MW (P/RT ) is a proportionality constant in this case
Question #10 (page 57):
Using relationship: V = nR * (T) * (1/P) (from PV=nRT)
V ↓, when T ↓,
V ↓, when P↑, i.e. (1/P)↓,
Question #13 (page 57):
Try using elimination method
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Chapter 3
Study page 59 to page 61, staring
- Subatomic particles
- Isotopes
- The Born Model of the Atom
Practice
- Solve the Problem on page 61.
- Solve Question #1 in the Chapter Review Questions on page 72
Watch video: Charge of an Electron: Millikan’s Oil Drop Experiment
