2. Which statement is TRUE for a chemical change?
er
Identity of the substance is not
changing
O Mass is conserved
The substances always changes
from solid to liquid

chemistry sucks a**

explanation:

it's filtration, but this is an assumption so my apologies if i got this

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.

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