Oxygen . A. breaks down food into energy B. is found in healthy bones and teeth C. is an organic element D. is an important element in DNA

air quality

poor drinking water

and heavy polution

can lead to poor health

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l