Answer:
Agree
Explanation:
Theories are refined and then become laws and laws are somehow more important than theories. In science actually what a law is, is a descriptive generalization. So we talk about the laws of thermodynamics that tell you about heat under different circumstances.
There are several various of expressing concentration. For instance, mass percent, volume percent, Molarity, Normality, Molality, etc.
In present case, weight of solute and solvent are given, so it will be convenient to express concentration in terms of mass percent.
Given: weight of solute (Ca2+) = 8500 g
weight of solvent (water) = 490 g.
Therefore, mass of solution = 8500 + 490 = 8990 g
Now, mass percent =

=

= 94.55 %
Answer: Concentration of calcium ions is in this solution is 94.55 % (w/W)
Answer:
I think its iron(II) oxide
Explanation:
The substance is black but when it's mixed with water it turns green solution so when mixed with sodium Hydroxide it turns green
The answer is 365 grams because you need to subtract 411 by 46.