D. Cell membrane: surrounds a cell and allows substances to pass in and out
Answer:
the answer is true
Explanation:
as sound travels through the air it creates a disturbance in the particles of the medium
A method of procedure that has characterized natural sciences the 17th century, consisting in systematic observation, measurement, and experiments, and the formulation, testing, and modification of hypotheses.
<u>Answer:</u> The amount of p-toluidine hydrochloride contained is 2.4 moles.
<u>Explanation:</u>
To calculate the number of moles for given molarity, we use the equation:

Molarity of p-toluidine hydrochloride solution = 0.167 M
Volume of solution = 70. mL
Putting values in equation 1, we get:

Hence, the amount of p-toluidine hydrochloride contained is 2.4 moles.