Two separate pure substances X and Y are heated. At the start, both substance X and substance Y are in the solid state. The graph shows how the temperature of each substance varies with time. What does the graph show about the substances?
- ASubstance X has a lower boiling point than substance Y.
- BSubstance X has a lower melting point than substance Y.
- CSubstance Y has a lower boiling point than substance X.
- DSubstance Y has a lower melting point than substance X.