Answer: A saturated solution, by definition, contains an amount of solute equal to the amount of dissolved solute in equilibrium with an undissolved solute. We could, however, make a supersaturated solution in which the solvent contains more solute than would be in equilibrium with undissolved.
Explanation: More solute cannot be dissolved at a given temperature in a saturated solution. This is because the solute dissolves in a solvent due to the space between the solvent particles, but with the continuous addition of solute, the space between the solvent particles is filled. As a result, no more solute particles can dissolve in the solvent.
1. it increases then decreases i.e +1, +2, +3, +4, +5, -2, -1 then 0.
2. group 6 elements have more valence electrons than group 2.
3.fluorine is the most reactive because reactivity and electronegativity reduces down the group.
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<u>Answer:</u> The enthalpy of the reaction for given amount of aluminium will be 
<u>Explanation:</u>
We are given:
Moles of aluminium = 12 moles
For the given chemical reaction:
By Stoichiometry of the reaction:
If 2 moles of aluminium produces -850 kJ of energy.
Then, 12 moles of aluminium will produce = 
of energy.
Converting this into three significant figures, we get:
Thus, the enthalpy of the reaction for given amount of aluminium will be
A pure crystalline substance is a substance with an almost perfect regular and periodic pattern in a solid state. This makes this type of substance a hard one compared to an amorphous substance which is soft because of the irregular pattern within.
