Summary
Summary Practice
- Course
- Institution
- Book
Summary study book The Physics Book of DK - ISBN: 9780241450048 (Pract)
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
MOTION IN PHYSICS
-
Give food for ur brain
-
What is the velocity of sound notes?
Seller
Follow
rami1
Content preview
NAME:___________________________ Section:_____ Student Number:__________________Spring 2020 Chemistry 2000 Midterm #2A ____/ 65 marks
INSTRUCTIONS: 1) Please read over the test carefully before beginning. You should have 8 pages
of questions, a blank “overflow” page and two pages of data sheets with
periodic table.
2) If your work is not legible, it will be given a mark of zero.
3) Marks will be deducted for incorrect information added to an otherwise correct
answer.
4) Marks will be deducted for improper use of significant figures and for missing
or incorrect units.
5) Show your work for all calculations. Numerical answers without supporting
calculations will not be given full credit.
6) You may use a calculator but only for the purposes of calculation. No text-
capable calculators are allowed.
7) You have 90 minutes to complete this test.
Confidentiality Agreement:
I agree not to discuss (or in any other way divulge) the contents of this exam until after 8:30 pm Mountain
Time on Tuesday, March 17th, 2020. I understand that breaking this agreement would constitute academic
misconduct, a serious offense with serious consequences. The minimum punishment would be a mark of
0/65 on this exam and removal of the “overwrite midterm mark with final exam mark” option for my grade
in this course; the maximum punishment would include expulsion from this university.
Signature: ___________________________ Date: _____________________________
Course: CHEM 2000 (General Chemistry II)
Semester: Spring 2020
The University of Lethbridge
Question Breakdown
Q1 /7
Q2 /6
Q3 / 13
Q4 / 10
Q5 /3
Q6 /8
Q7 / 18
Total / 65
, NAME:___________________________ Section:_____ Student Number:__________________
1. [7 marks]
(a) Complete each statement with one of the following symbols: >, < or = [4 marks]
For an allowed process at constant temperature and pressure,
i. ∆𝑆𝑢𝑛𝑖𝑣𝑒𝑟𝑠𝑒 > 0
ii. ∆𝐺 < 0
iii. 𝐸 > 0
iv. 𝐾 > 𝑄
(b) One of the statements in part (a) is true under any conditions (not just at constant temperature and
pressure). Which one? [1 mark]
∆𝑆𝑢𝑛𝑖𝑣𝑒𝑟𝑠𝑒 > 0
(c) In statement (a) i., why do we have to write ∆𝑆𝑢𝑛𝑖𝑣𝑒𝑟𝑠𝑒 ? Why can’t we just write ∆𝑆? [1 mark]
∆𝑆 refers to the entropy change for the system only. ∆𝑆𝑢𝑛𝑖𝑣𝑒𝑟𝑠𝑒 also includes the entropy change
for the surroundings, and the second law of thermodynamics states that the entropy of the universe
must increase in any thermodynamically allowed process.
(d) In statement ii. in part (a), can ∆𝐺 be replaced by ∆𝐺°? Why or why not? [1 mark]
No.
∆𝐺° refers specifically to the free energy change of a reaction under standard conditions. ∆𝐺
refers to the free energy change of a reaction under whatever conditions it is actually being run.
2. Consider the following reaction that takes place in aqueous acid. [6 marks]
2− 2+ 3+
𝐶𝑟2 𝑂7(𝑎𝑞) + 𝑍𝑛(𝑠) → 𝑍𝑛(𝑎𝑞) + 𝐶𝑟(𝑎𝑞)
(a) Balance this equation under acidic conditions. [3 marks]
For full marks, your answer must include balanced half reactions.
2+
( 𝑍𝑛(𝑠) → 𝑍𝑛(𝑎𝑞) + 2 𝑒− ) × 3
2− + 3+
𝐶𝑟2 𝑂7(𝑎𝑞) + 14 𝐻(𝑎𝑞) + 6 𝑒 − → 2 𝐶𝑟(𝑎𝑞) + 7 𝐻2 𝑂(𝑙)
2− + 3+ 2+
𝐶𝑟2 𝑂7(𝑎𝑞) + 3 𝑍𝑛(𝑠) + 14 𝐻(𝑎𝑞) → 2 𝐶𝑟(𝑎𝑞) + 3 𝑍𝑛(𝑎𝑞) + 7 𝐻2 𝑂(𝑙)
(b) Identify the oxidizing agent. [1 mark]
𝐶𝑟2 𝑂72−
(c) Identify the reducing agent. [1 mark]
𝑍𝑛
(d) What is 𝜈𝑒 for this reaction? [1 mark]
6
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller rami1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
56326 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now