100 points answer hurry
which of these is a mixture?
a. carbon dioxide
b. calcium
c. salt water
d. potassium

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.

6what is the importance of water on earth? a) it keeps the top layer of the geosphere cool b) it allows life to exist c) it provides ice at the poles d) it creates earth's blue color from space

Give the orbital configuration of the phosphorus (p) atom.