Question

The graph below shows the shape of the curve obtained by a student when solid X was heated to boiling determine the melting point of solid X

1. Determine the melting point of Solid X
2. State and explain what proportion PQ, QR and RS represent

Answer 1

1. ​​​​​​​QR
2. State and explain what proportion PQ, QR and RS represent.
   • PQ- Increase of temperature towards melting point. The solid X continuously absorbs heat energy in this region as it heads towards it's melting point.
   • QR- melting point. Solid x has reached its melting point and therefore the heat energy absorbed is contant in this region.
   • RS- increase of temperature to boiling point. After melting, X continuously absorbs more heat energy as it heads towards its boiling point

Answer 2

100 degrees