Exam (elaborations)
biochem module 2 exam
- Module
- Biochem module 2 exam
- Institution
- Biochem Module 2 Exam
biochem module 2 exam
[Show more]
Content preview
biochem module 2 examThe pH of a solution of 0.0010 M NaOH is:
1
11
8
0
14 - -11 [Kw=[H+ ][OH- ] = 1.0 x 10-14; [H+ ][0.0010] = 1.0 x 10-14
[H+ ]=1.0 x 10-11; pH=-log[1.0 x 10-11;]=11]
-Water is a unique molecule. Which of the following contributes to water's
unique place in the chemical world?
- The geometry of the molecule
- The polarity of the O-H bonds
- The ability of water molecules to hydrogen bond
- The bond angle of water
- All of the answers are correct - -- All of the answers are correct
-The bent shape of water is due to ______________.
- The dipole arrows in a water molecule - - The electronegativity difference
between hydrogen and oxygen
- The unequal electron sharing between hydrogen and oxygen
- The unshared electron pairs on the oxygen atom
- None of the answers are correct - -- The unshared electron pairs on the
oxygen atom
-The H+ concentration of a solution is 1.2 x 10-3 M. What is the pH?
-1.20
1.20
3.12
-2.92
2.92 - -2.92
-If the Ka of an acid is 5.63 x 10-3, what is the pKa?
6.86
2.25
5.63
10.12
1.38 - -2.25 [pKa = -log(5.63 x 10-3) = 2.25]
, -List the acids in DECREASING order of strength (strongest to weakest):
Nitrous acid (Ka = 4.0 x 10-4);
acetic acid (Ka = 1.7 x 10-5);
phosphoric acid (Ka = 7.3 x 10-3)
- Nitrous acid, acetic acid, phosphoric acid
- Acetic acid, nitrous acid, phosphoric acid
- Phosphoric acid, nitrous acid, acetic acid - Acetic acid, phosphoric acid,
nitrous acid
- None of the above - -- Phosphoric acid, nitrous acid, acetic acid
-Elemental iodine (I2) is a solid at room temperature. What is the dominant
attractive force that exists between I2 molecules in the solid?
- London forces
- Hydrogen bonds
- Halogen forces
- Dipole-dipole forces
- Covalent bonds - -- London forces
-Which one of the following molecules can form a hydrogen bond?
A. HBr
B. HCl
C. NH3
D. CH4
E. H - -C. NH3
-A hydrogen bond can form between a hydrogen atom bonded to oxygen, O-
H, and ________.
C
B
Cl
P
N - -N
-dipole arrow points towards - -negative side
-The following reaction occurs in glues purchased from hardware stores.
Customers use this product to glue plastic together. Epoxy (l) + hardener (l)
⟶ Glue (s) + heat given off What is the sign (+ or -) of the change in Δ G
and Δ H?
A) Δ G is (+) and Δ H is (-)
B) Δ G is (-) and Δ H is (-)
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 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 Victorious23. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £8.06. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77973 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now