Scientists are studying compounds in a newly discovered rain forest plant. the plant produces an unusual substance that local pe
ople from the area say acts as an anesthetic.
if another scientist tests the substance using iodine, which macromolecule is the scientist testing for?
a. lipid
b. carbohydrate
c. nucleic acid
d. protein
if another scientist tests the substance using iodine, which macromolecule is the scientist testing for?
a. lipid
b. carbohydrate
c. nucleic acid
d. protein
2 answers:
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<u>Answer:</u> The cell voltage of the given chemical reaction is 2.74 V
<u>Explanation:</u>
For the given chemical reaction:
Here, gold is getting reduced because it is gaining electrons and nickel is getting oxidized because it is loosing electrons.
<u>Oxidation half reaction:</u>
<u>Reduction half reaction:</u>
Substance getting oxidized always act as anode and the one getting reduced always act as cathode.
To calculate the of the reaction, we use the equation:
To calculate the EMF of the cell, we use the Nernst equation, which is:
where,
= electrode potential of the cell = ?V
= standard electrode potential of the cell = +2.76 V
n = number of electrons exchanged = 2
Putting values in above equation, we get:
Hence, the cell voltage of the given chemical reaction is 2.74 V
Molarity of solution = 1.6 M
<h3>Further explanation</h3>Given
40 g NaOH
6 L solution
Required
Steps to solve the problem of molarity
Solution
No additional information about the question.
If you want to make the solution above, then we just need to put the existing NaOH (40 g) into 6 L of water, then do the stirring (in a warm temperature above the hot plate will speed up the NaOH dissolving process)
But if you want to know the molarity of a solution, then
- 1. we calculate the moles of NaOH
MW(molecular weight) of NaOH=
Ar Na+ Ar O + Ar H
23 + 16 + 1 = 40 g/mol
so mol NaOH :
- 2. Molarity(M)