PChem312 f20 w2

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Monday, Aug 24, 2020

Start reading chapter 1

Questions about Heating Cooling curve Excel?

Sec 1.2: Basic Definitions

- Systems and Surroundings

DEMO: box of system types

• open/closed...exchange of matter or not
• adiabatic/diathermal...heat loss or not
• walls...rigid or moveable/permeable/impermeable
• system variables...for a gas, pressure (P), temperature (T), volume (V), amount (n)
• equation of state...for a gas, ideal gas law

We mainly study gases while developing the basic aspects of thermodynamics

• 0^th Law of Thermodynamics: thermometers work!

- Internal Combustion Engine Example Calculation (worksheet)

Wednesday, Aug 26, 2020

Announcements:

- I will verify your Heating/Cooling Curve EXCEL worksheet in lab (were you proactive or are you now reactive?)

- I will verify your combustion worksheet in lab

Questions about Combustion worksheet?

Sec 1.4: Equations of State/Ideal Gas Law

- There is a STATE --> described by STATE VARIABLES --> the relationship between the state variables is the EQUATION OF STATE (variables).

- Equations of state allow us to have predictive powers.

- Why do we fit data to math equations...data reduction...x/y data set of 100 points can be reduced to slope and y-intercept.

- PV=nRT or PV=NkT

• Dimensional Analysis - nR = Nk ? [R = 0.08314(bar*L)/(mol*K), k = 1.38e-23 J/K, N = number of molecules; 1L = 1 md³, J = Pa*m³, 1 bar = 1e5 Pa) ...yes nR=Nk

- Intensive (density)/Extensive (mass/volume) properties

Side conversation: Do you have an equation of state that we can use to predict your behavior? Myers-Briggs Type Indicator

Sec 1.5: Brief Intro to a Real Gas

- Kinetic Molecular Theory of Gases (handout)

- van der Walls equation; and example of a real gas equation of state/worksheet.

• [Table 7.4]

Thursday, Aug 27, 2020

Meet in CSB 378

Activities

- Myers-Briggs discussion

- ACS Talented 12, 2020.

- Sec 1.3: Thermometry

• Thermometry Types
• Absolute zero data collection/graphing

Example of measuring one system variable to get another...

- Pressure data collection: How many moles can you add to a PVC pipe?

• Vernier pressure probe
• PVC pipe, cut to length

Friday, Aug 28, 2020

Read Chapter 2