Answer:- 0.0002 ppm
Solution:- 1 ppm is one mg of solute per liter of solvent or one kg of solvent.
It asks to convert
pb in blood to ppm. density of blood is
.
Let's convert micrograms to milligrams and also calculate the mass of blood from it's given density. The set up could be made using dimensional analysis and doing unit conversions as:
First the set up for the conversion of micrograms of Pb to milligrams:

= 
Now, the set up for converting dL of blood to kg using it's given density and unit conversion from dL to mL as:

= 0.200 ppm
The answer is A, a new chemical substance has to be formed for there to be a chemical change. This is because chemical change happens when a phase of matter changes due to chemicals.
No. The mass is released into the air.
Answer:
you knsiebedi djd dud ud dud djd du dud djd did d
The sand on the beach cools down at night then the ocean is because the sand is on dry land.