<u>Answer:</u> The volume of stock solution needed is 0.016 L
<u>Explanation:</u>
To calculate the volume of stock solution, we use the equation:

where,
are the molarity and volume of the stock solution
are the molarity and volume of diluted solution
We are given:

Putting values in above equation, we get:

Hence, the volume of stock solution needed is 0.016 L
Answer:
The answer is option b.
Explanation:
Amplitude is the distance apart each wave is.
Answer:
I think that's a physical change since nothing is getting it's properties changed.
Explanation:
a chemical change usually changes the properties and cannot be changed back, this is simply washing your hands so I would guess that a physical change. think of like putting water on paper, the properties aren't changed you just have a paper with water on it now and can be easily dried.