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Paraphin [41]
3 years ago
9

Select the correct answer.

Chemistry
1 answer:
amid [387]3 years ago
8 0

Answer:

D. Na+

Explanation:

Na+ is the only ion here that is not related to pH. Adding OH- increases pH, and adding H3O+ or H+ (the two are interchangeable) decreases pH.

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Given the information below, which is more favorable energetically, the oxidation of succinate to fumarate by NAD+ or by FAD? Fu
larisa86 [58]

Answer:

Oxidation with FAD is more favorable energetically.

Explanation:

With FAD as the electron acceptor;

∆E'° = (E'° from reduction reaction) – (E'° from oxidation reaction)

∆E'° = (-0.219) - 0.031 = -0.25 V

The standard free energy change, ∆G'° = -nF∆E'° ; where n is number of moles of electrons = 2, F is Faraday's constant = 96.5 KJ/V.mol

∆G'° = -2 × 96.5 KJ/V.mol × (-0.25)

∆G'° = 48.25 KJ/mol

With NAD+ as electron acceptor

∆E'° = (E'° from reduction reaction) – (E'° from oxidation reaction)

∆E'° = (-0.320) - 0.031 = -0.351 V

The standard free energy change, ∆G'° = -nF∆E'° ; n = 2, F = 96.5 KJ/V.mol

∆G'° = -2 × 96.5 KJ/V.mol × (-0.351)

∆G'° = 67.74 KJ/mol

From the above values obtained, the oxidation by FAD is more favorable energetically as the free energy is less positive than with NAD+

6 0
3 years ago
A liquid occupies 321ml and has a mass of 376g. what is the density of the liquid?​
oee [108]

Answer:

The density of the liquid is 1.153 grams/ml.

Explanation:

You have to use the fomula of density

density = mass/volume ⇒ density = 376 grams/321 ml ⇒

density = 1.153 grams/ml.

6 0
3 years ago
The nucleoside adenosine exists in a protonated form with a pKa of 3.8. The percentage of the protonated form at pH 4.8 is close
Natasha_Volkova [10]

Answer:

Ok:

Explanation:

So, you can use the Henderson-Hasselbalch equation for this:

pH = pKa + log(A^-/HA) where A- is the conjugate base of the acid. In other words, A- is the deprotonated form and HA is the protonated.

We can solve that

1 = log(A^-/HA\\) and so 10 = A^-/HA or 10HA = A-.  For every 1 protonated form of adenosine (HA), there are 10 A-. So, the percent in the protonated form will be 1(1+10) or 1/11 which is close to 9 percent.

6 0
3 years ago
At what point would a chemical bond form between two atoms.
PIT_PIT [208]

Answer:Chemical bonds form when the valence electrons of one atom interact with the valence electrons of another atom.J

Explanation:  Byee stay safe: Wear your mask, drink water and stan bts

also can I have brainliest

5 0
2 years ago
Which object will experience the strongest gravitational attraction to Earth?
Orlov [11]

Answer:

A

Explanation:

The strength of the gravitational force between two objects depends on mass and distance. The object with the greatest mass would be the car.

3 0
3 years ago
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