Chemistry T.2 Final revision Grade 10

To calculate the percent composition of a compound, you need to know the mass of each element and the total mass of the compound.

• True

• False

A solution that contains a small amount of solute is called a concentarted solution.

• True

• False

Diluting a solution increases the number of moles of solute per unit volume, but the total number of moles of solute stays the same.

• True

• False

If the percent by mass of carbon in methane, CH4, is 75%, then 100 grams of methane contain 25 grams of hydrogen.

• True

• False

The molecular formula of a compound is always a multiple of its empirical formula.

• True

• False

The formula for methane, CH4, is both a molecular and an empirical formula.

• True

• False

Molarity is calculated by dividing the number of moles of solute by the volume of the solvent in liters.

• True

• False

(concentarted solution) is a solution that contains a large amount of solute compared to the solvent.

(Percent composiotion) is the percent by mass of each element in a compound.

(Emprical Formula) is the formula that gives the lowest whole-number ratio of the elements in a compound.