Which is more pure, a chemical that contains $1g$ of contaminating material in ${10}^{6}kg$ or

a chemical that contains ${10}^{-2}mg$ of contaminants in ${10}^{-3}kg?$

If you prepare a $1$:$1$ dilution of a $10m\frac{g}{m}l$ solution, what is the final concentration of

the solution?

If you prepare a $\frac{1}{10}$ dilution of a $10m\frac{g}{m}l$ solution, what is the final concentration of

the solution?