A) ppm or ppb
Explanation:
To express the concentration of the lead sample in the water, the best way is to use ppm or ppb.
ppm = parts per million
ppb = parts per billion
- ppm and ppb are used to make sense of small concentration values.
- It is the best way of expressing the small amount of solute that is dissolved in a large amount of solvent.
- Other percentage units will not make sense for this expression as they would be too small to make sense of.
The ppm or ppb helps to simply express dilute concentration.
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Answer:
Explanation:
Interesting way to teach molarity. Count the number of Black dots in Vessel 1. There are 4. There are also 4 clear dots. The number Ks = Cls
The molarity is 4 units of KCl/volume of vessel 1.
Now look at vessel 2. All you need do is count the black dots. There are fewer of them
There are 8 by my count. The volume hasn't changed but the black dots have doubled. That means there are 8 units of CaCl2 / volume of Vessel 2 (which is the same volume as Vessel one.)
The answer cannot be anything but D.
Before you count the clear dots in vessel two, make a guess of how many there should be. Notice the formula for CaCl2 has a two in it. Make your best guess and count away.
Answer:
Density of the oil is lesser than that of the water
Explanation:
The density of water is given as 1.0g/cm³.
Salad oil is found to float on water, this implies that the density of this salad oil is lesser than that of the water.
- When the density of a substance is greater than another, it will sink. If the density of the salad oil is greater than that of water, then it will sink and not float.
- Since the oil floats on water, the density of the oil is lesser than that of the water.
Density is the mass per unit volume of a substance.
Answer:
CaCO3 -> CaO + CO2
Explanation:
Woahhhh, did you balance it yourself just then?
A swimming pool is a solution as it is a solution of chlorinated water