Which of the following is true about the properties of aqueous solutions?
a. a ph change from 5.0 to 6.0 reflects an increase in the hydroxide ion concentration ([oh-]) of 20%
b. a ph change from 8.0 to 6.0 reflects a decrease in the proton concentration ([h+]) by a factor of 100
c. charged molecules are generally insoluble in water
d. hydrogen bonds form readily in aqueous solutions
e. the ph can be calculated by adding 7 to the value of the poh

d. Hydrogen bonds forma readily in aqueous solutions.

Explanation: pH is a logarithmic scale which means that a change of 1 unit on it equlas a change of 1 order of magnitude (1, 10, 100 etc)in the concentration of [H+] or [OH-] depending on if we are talking of pH or pOH. So a its not correct. And b is not correct either because when pH decrease, H+ concentration increase.

On the other hand, water is a dipolar molecule so it has negative and positive charge and dissolves easily charged molecules. This difference in charge occurs because oxygen atoms have free electrons arround that make them negative and hydrogen atoms give electrons so they remain positive. Taking into account that opposite charges attract each other, the positive hydrogen of one molecule stay closer to oxygen of other because of charge affinity. Thats haw hydrogen bonds are formed and water facilitated them.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.  

d. planting trees

the trees take in carbon to make oxygen.