AQA GCSE Chemistry 4.3 Quantitative chemistry overview quiz quiz

The total mass of products equals the total mass of reactants

Mass is always lost during the course of any chemical reaction

Mass increases in every reaction

Only gases conserve mass

$17$

$18$

$16$

$34$

$6.02 \times 10^{-23}$

$1.0 \times 10^{14}$

$6.02 \times 10^{23}$

$3.0 \times 10^{8}$

$0.5$ mol

$1$ mol

$24$ mol

$2$ mol

The ratio of moles that react

The ratio of masses that react

The number of atoms in each molecule

The percentage yield

The reactant present in the greatest mass

The reactant that is completely used up first and controls the amount of product

The reactant that is left over at the end

The reactant that happens to have the very largest relative formula mass of the two

$5$ g/dm$^3$

$50$ g/dm$^3$

$80$ g/dm$^3$

$0.08$ g/dm$^3$

Theoretical mass divided by actual mass, times 100

Mass of useful product divided by total mass of products, times 100

Moles of product times the Avogadro constant

Actual mass of product divided by theoretical mass, times 100

$75\%$

$70\%$

$80\%$

$133\%$

Some of the atoms are completely destroyed during the chemical reaction

Some product is lost during transfer or the reaction is incomplete

The relative formula mass is too high

The Avogadro constant is too small

It uses more raw materials

It always gives a 100 percent yield

It produces less waste, so the process is more sustainable

It increases the relative formula mass of the useful product

Atoms are destroyed

The metal evaporates

Oxygen is absorbed from the surrounding air by the solid

Carbon dioxide gas is given off and escapes