Compare a base unit and a derived unit, and list the derived units used for
density and volume.

Explanation:

The fundamental units of a measurement is known as its base unit. The units of these substances serves as the base through which other  quantities depends. Examples of such quantities are mass, length, time, electric current, temperature, amount of substance and luminous intensity.

Derived units are those that results from the combination of the fundamental or basic units. Examples of derived quantities are force, volume, density, pressure e.t.c.

Derived units of Density:

kgm⁻³

gcm⁻³

Derived unit of volume:

m³

cm³

mL

L

dm³

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.