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biochem module 2 exam questions and answers rated A+ 2024/2025
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biochem module 2 examThe pH of a solution of zero.0010 M NaOH is:
1
11
8
0
14 - ANS11 [Kw=[H+ ][OH- ] = 1.Zero x 10-14; [H+ ][0.0010] = 1.Zero x 10-14 [H+ ]=1.Zero 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 region in
the chemical global?
- The geometry of the molecule
- The polarity of the O-H bonds
- The capacity of water molecules to hydrogen bond
- The bond angle of water
- All of the answers are correct - ANS- All of the solutions are correct
The bent form of water is because of ______________.
- The dipole arrows in a water molecule - - The electronegativity distinction 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 - ANS- The unshared electron pairs at the oxygen atom
The H+ awareness of an answer is 1.2 x 10-3 M. What is the pH?
-1.20
1.20
3.12
-2.92
2.Ninety two - ANS2.Ninety two
If the Ka of an acid is 5.Sixty three x 10-three, what's the pKa?
6.86
2.25
5.Sixty three
10.12
1.38 - ANS2.25 [pKa = -log(5.63 x 10-3) = 2.25]
List the acids in DECREASING order of electricity (most powerful to weakest):
, Nitrous acid (Ka = four.Zero x 10-4);
acetic acid (Ka = 1.7 x 10-five);
phosphoric acid (Ka = 7.Three 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 - ANS- Phosphoric acid, nitrous acid, acetic acid
Elemental iodine (I2) is a stable at room temperature. What is the dominant appealing
pressure that exists between I2 molecules within the solid?
- London forces
- Hydrogen bonds
- Halogen forces
- Dipole-dipole forces
- Covalent bonds - ANS- London forces
Which one of the following molecules can shape a hydrogen bond?
A. HBr
B. HCl
C. NH3
D. CH4
E. H - ANSC. NH3
A hydrogen bond can shape among a hydrogen atom bonded to oxygen, O-H, and
________.
C
B
Cl
P
N - ANSN
dipole arrow factors closer to - ANSnegative aspect
The following reaction happens in glues purchased from hardware stores. Customers use
this product to connect plastic together. Epoxy (l) + hardener (l) ⟶ Glue (s) + heat given off
What is the signal (+ or -) of the alternate in Δ G and Δ H?
A) Δ G is (+) and Δ H is (-)
B) Δ G is (-) and Δ H is (-)
C) Δ G is (-) and Δ H is (+)
D) Δ G is (+) and Δ H is (+)
E) None of the above - ANSB) Δ G is (-) and Δ H is (-)
Which of the following is the loose-power exchange of a reaction?
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