Listenwhich change in the h+ ion concentration of an aqueous solution represents a decrease of one unit on the ph scale?

Explanation:

The pH scale is a logarithmic scale that runs from 1 to 14.

1 is the lower limit of the scale and 14 is the upper limit of the scale. On a pH scale, to represent a decrease of one unit, the concentration of the hydrogen ion or the hydroxyl ion must change.

A decrease in 1 unit or 1 pH represents a concentration of 10moldm⁻³.

                    Note: pH= -log₁₀[H⁺]

b) mutualism

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explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.