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vladimir1956 [14]
3 years ago
8

A scientist has found a new drug that appears to provide weight loss in humans without dieting. The scientist has tested the dru

g on thousands of people and has found few side effects. Which of the following should the scientist do next?
Chemistry
1 answer:
g100num [7]3 years ago
4 0

Answer:

Give the test to a company that gives permission for the drug to given to the rest of the world.

Explanation:

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What concentration of benzoic acid will have a ph of 4.0? (for benzoic acid, pka=4.20)?
aalyn [17]
We are given the molar concentration of an aqueous solution of weak acid and the pH ofthe solution, and we are asked to determine the value of Ka for the acid.
The first step in solving any equilibrium problem is to write the equation for the equilibriumreaction. The ionization of benzoic acid can be written as seen in the attached image (1).
The equilibrium-constant expression is the equation number (2)
From the measured pH, we can calculate pH as seen in equation (3)
To determine the concentrations of the species involved in the equilibrium, we imagine that thesolution is initially 0.10 M in HCOOH molecules. We then consider the ionization of the acidinto H+ and HCOO-. For each HCOOH molecule that ionizes, one H+ ion and one HCOO- ionare produced in solution. Because the pH measurement indicates that [H+] = 1x 10^-4 M atequilibrium, we can construct the following table as seen in the equation number (4)
To find the value of Ka, please see equation (5):
We can now insert the equilibrium concentrations into the expression for Ka as seen in equation (6)
Therefore, 2.58x10^-4 M is the concentration of benzoic acid to have a pH of 4.0

7 0
3 years ago
PLEASE HURRY!!!Which common characteristic makes both batteries and fuel cells practical to use?
12345 [234]

Answer:

Option A

Explanation:

They are portable resources that convert chemical energy to electrical energy

6 0
3 years ago
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What is the maximum number of orbitalks for each set of quantum numbers? If it is not possible to determine the maximum number o
kolbaska11 [484]

Answer:

See Below for answer!

Explanation:

In order to find the number of orbitals given the principal quantum number, n, we can use 2n^{2}. For example n=2 would have 8 orbitals.

A) 32

B) 98

C) 50

D) 18

8 0
2 years ago
When 2 grams of Hydrogen (H2) react with 32 grams of Oxygen (O2) the reaction yields hydrogen peroxide (H2O2). How many grams of
alexgriva [62]
The correct answer is D: 34

Hope it helps :)
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3 years ago
Describe the formation of an image in a pinhole camera
Alla [95]

Answer:

Explanation:

A pinhole camera is a simple camera without a lens but with a tiny aperture, a pinhole camera – effectively a light-proof box with a small hole in one side. Light from a scene passes through the aperture and projects an inverted image on the opposite side of the box, which is known as the camera obscura effect.

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