Prepare for your exams
Get points
Guidelines and tips

Prepare for your exams

Study with the several resources on Docsity

Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips

Sell on Docsity

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search Store documents

The best documents sold by students who completed their studies

Search through all study resources

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents

20 Points

For each uploaded document

Answer questions

5 Points

For each given answer (max 1 per day)

All the ways to get free points

Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

University Rankings

Discover the best universities in your country according to Docsity users

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

From our blog

Exams and Study

Go to the blog

CHMY 361: How to Estimate Your Final Grade and Review of Thermodynamics Concepts, Slides of Physical Chemistry

Montana State University Physical Chemistry

ACS Standard Physical Chemistry Exam with solved Questions.

Typology: Slides

2018/2019

Uploaded on 02/11/2022

butterflymadam 🇺🇸

4.4

(26)

312 documents

1 / 19

This page cannot be seen from the preview

Don't miss anything!

ACS Standard

Physical Chem

Exam Taken

Tuesday by

21 students

Score %

33 55.0

32 53.3

31 51.7

29 48.3

28 46.7

27 45.0

26 43.3

25 41.7

24 40.0

23 38.3

22 36.7

21 35.0

19 31.7

18 30.0

16 26.7

Average

25.1 41.9 %

Last Year

38.6%

Nat. Avg.

52 %

Partial preview of the text

Download CHMY 361: How to Estimate Your Final Grade and Review of Thermodynamics Concepts and more Slides Physical Chemistry in PDF only on Docsity!

ACS Standard Physical Chem Exam Taken Tuesday by 21 students

Score % 33 55. 32 53. 32 53. 32 53. 31 51. 29 48. 28 46. 28 46. 27 45. 27 45. 26 43. 25 41. 24 40. 23 38. 22 36. 21 35. 19 31. 19 31. 18 30. 16 26. 16 26. Average 25.1 41.9 % Last Year 38.6% Nat. Avg. 52 %

CHMY 361 How to estimate your final grade Handout

December 7, 2017 Total points = 700; Homework is worth 100; midterms = 100 each, and final = The total possible homework points =150 , so: Total % = (total HW/150 * 100 + total exam points )/700 (after including your Final)

Last year’s letter grades were typical, but could be slightly different this year. T Total % Grade (Estimate) 90-100 A 86-89 A- 80-85 B+ 75-80 B 70-74 B- 68-70 C+ 63-67 C 60-62 C- 50-59 D

A little quiz

System = insulated room with weight lifter

Weight lifter works out and the room heats up

from 20o^ C to 25 o^ C

Are ∆ U, q, w positive, zero, or negative?

Always True Conditional

∆U = q + w

Adiabatic: q = 0 ; ∆U = w ; Constant V:

∆U = C (^) v (T 2 -T 1 ) if Cv constant For ideal gas the above is always true (even if volume changes)

H = U + PV

∆H = ∆U + P 2 V 2 - P 1 V 1

For P=Pext = constant and PV work only:

∆H = q =

∆H = C (^) P (T 2 -T 1 ) if C (^) P constant For ideal gas the above is always true (even if pressure changes)

for Pext constant: wpv = -Pext (V 2 – V 1 ) ;

if isothermal reversible and ideal gas:

Solids and Liquids (volume changes are very small) Cp ≅ Cv and ∆H ≅ ∆U

∆ H T C dTp

T = (^) ∫ (^1)

= −

= − (^) ∫

P dV

ext

V ext

w (^) pv = − (^) ∫ PdV = − nRT V V V

V (^) ln 2 (^11)

U C dT

T ∆ =∫ T 2

1 v

Reversible Isothermal PV work (ideal gas)

p ext = p = nRT/V (balanced forces)

ONLY if p = pext = and ideal gas (but is common case)

V

dV

V

nRT

w pextdV pdV

Sum of fractional changes = natural logarithm

ln

V

nRT

V

dV

w = − nRT = −

V

An integral is just a

Sum

What are ∆ U and q?

∆ U =0 (isothermal, ideal gas), therefore q = -w

361 Lec
Tue 14sep

NOOOO

At constant T and P, the Gibbs Free Energy is king.

Definition: G = H-TS

∆ G = ∆ H- ∆ (TS) always true

But, most useful for constant T and P=Pext = constant

so that: ∆ (PV) =P ∆ V and ∆ (TS) = T ∆ S; then

∆ G = ∆ U + p ∆ V - T ∆ S = q - Pext ∆ V + w (^) useful + p ∆ V - T ∆ S

but, ∆ S surr = -q/T so q = -T ∆ S surr

∆ G = -T( ∆ S + ∆ Ssurr) + w (^) useful

∆ G = -T ∆ S (^) univ + w (^) useful if T and p constant

361 Lec 12 Mon 20sep

non-PV

(“other”) work

(w = - p (^) ext ∆ V + w (^) useful )