2.3 Properties of materials

The table shows data for four halogens.

Halogen	Boiling point ( $∘C^\circ\mathrm{C}$ )	Energy needed to break the covalent bond in one mole of molecules ( $kJ/mol\mathrm{kJ/mol}$ )
$F2\mathrm{F_{2}}$	−188	158
$Cl2\mathrm{Cl_{2}}$	−34	243
$Br2\mathrm{Br_{2}}$	59	193
$I2\mathrm{I_{2}}$	184	151

A student says, "The stronger the covalent bond in a halogen molecule, the higher its boiling point."

Which statement about the student's idea is correct?

[1]

The student is correct, because boiling breaks the covalent bonds in the molecules.

The student is incorrect, because boiling only overcomes forces between the molecules.

The student is correct, because chlorine has the strongest bond and the highest boiling point.

The student is incorrect, because iodine has the strongest bond but the lowest boiling point.

The table shows data for four halogens.

Halogen	Boiling point ( $∘C^\circ\mathrm{C}$ )	Energy needed to break the covalent bond in one mole of molecules ( $kJ/mol\mathrm{kJ/mol}$ )
$F2\mathrm{F_{2}}$	−188	158
$Cl2\mathrm{Cl_{2}}$	−34	243
$Br2\mathrm{Br_{2}}$	59	193
$I2\mathrm{I_{2}}$	184	151

A student says, "The stronger the covalent bond in a halogen molecule, the higher its boiling point."

Which statement about the student's idea is correct?

The student is correct, because boiling breaks the covalent bonds in the molecules.

The student is incorrect, because boiling only overcomes forces between the molecules.

The student is correct, because chlorine has the strongest bond and the highest boiling point.

The student is incorrect, because iodine has the strongest bond but the lowest boiling point.

2.3 Properties of materials Questions