Answer: Option (B) is the correct answer.
Explanation:
A change which brings change in composition of atoms of a substance to result in the formation of new substances is known as a chemical change.
Therefore, in a chemical change new substances are formed which have different properties as compared to their reactants.
For example, 
Thus, we can conclude that during all chemical changes atoms rearrange to form new substances.
Its probably becuase of the amount of minerals found in the ocean floor.Salt just so happens to be a major one.not only that,but the amount of salt that the human body emits while while outside,normally by bodies of water,it could also be that.
Used the Ideal gas law to get the grams of carbon dioxide
PV=nRT Where p is pressure, v is volume, n is a number of moles, t is temperature and r is the ideal gas constant. The value of R is 0.0821.
Solution
First, find the mole of carbon dioxide
n= PV/RT
= 1 x 1.0 / 0.081 x (2.73 x 102)
= 1 / 0.081 x 278.46
= 1 / 22.56
= 0.045 mol
Convert the moles into grams
Grams of CO2 = 0.045 mol x 44 g/mol = 1.98 g
So the grams of CO2 is 1.98g
If the level of acid in a lake increased, then the number of fish that live there will be decreased because highly acidic lakes will not have enough food for the fish to survive. Acidic level increases , then availability of food for fish decreases as some food will be contaminated so if the fish won't got enough food for their survival then their number of fish decreases.
The answer is A I believe, the subscript 2 indicates that there are two magnesium ions for each ion of chlorine. the chloride ion is twice the size of the magnesium ion. magnesium and chlorine form a double covalent bond. there are two chloride ions for each magnesium ion.
