A student heats a sample of magnesium carbonate ( $MgCO3\text{MgCO}_3$ ) in a crucible to thermally decompose it into magnesium oxide ( $MgO\text{MgO}$ ) and carbon dioxide ( $CO2\text{CO}_2$ ).

The mass of the solid product left in the crucible at the end is found to be less than the calculated theoretical mass of magnesium oxide.

Which of the following is a possible reason for this?

Some solid was lost from the crucible during heating

The thermal decomposition of the magnesium carbonate was incomplete

The solid residue absorbed water vapor from the air after heating

Carbon dioxide gas stayed trapped inside the solid residue

A student heats a sample of magnesium carbonate ( $MgCO3\text{MgCO}_3$ ) in a crucible to thermally decompose it into magnesium oxide ( $MgO\text{MgO}$ ) and carbon dioxide ( $CO2\text{CO}_2$ ).

The mass of the solid product left in the crucible at the end is found to be less than the calculated theoretical mass of magnesium oxide.

Which of the following is a possible reason for this?

Some solid was lost from the crucible during heating

The thermal decomposition of the magnesium carbonate was incomplete

The solid residue absorbed water vapor from the air after heating

Carbon dioxide gas stayed trapped inside the solid residue

Calculations involving masses

Question 74

Markscheme

Calculations involving masses

Question 74

Markscheme

Calculations involving masses

Question 74

Calculations involving masses Questions

Calculations involving masses

Question 74

Calculations involving masses Questions