Which of the following statements is false?

a. When the hydrogen ion concentration decreases, the hydroxyl ion concentration also decreases.
b. When acids and bases are mixed, they react with each other to form water and a salt.
c. The pH of blood is slightly basic.
d. The more hydrogen ions in a solution, the more acidic the solution.

a. When the hydrogen ion concentration decreases, the hydroxyl ion concentration also decreases.

Explanation:

it is false because the concentration of hydroxyl ions remain constant. When H+ decreases, OH- concentration is automatically higher than H+. Both of them can't be decreased at the same time.

thermophiles, notice the prefix thermo.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c