Substance X, a simple molecular compound, is used as a low-temperature heat-transfer fluid. Under standard atmospheric pressure, it is a liquid at −50 ∘C-50\ ^\circ\text{C}−50 ∘C but evaporates to become a gas at room temperature (25 ∘C25\ ^\circ\text{C}25 ∘C).
Which row of the table shows the most likely melting point and boiling point for Substance X?
RowMelting Point (∘C)Boiling Point (∘C)A−3580B−120−78C−115−19D114184 \begin{array}{|c|c|c|} \hline \text{Row} & \text{Melting Point } (^\circ\text{C}) & \text{Boiling Point } (^\circ\text{C}) \\ \hline \text{A} & -35 & 80 \\ \hline \text{B} & -120 & -78 \\ \hline \text{C} & -115 & -19 \\ \hline \text{D} & 114 & 184 \\ \hline \end{array} RowABCDMelting Point (∘C)−35−120−115114Boiling Point (∘C)80−78−19184Select the correct row from the options below:
Row A
Row B
Row C
Row D
84 exam-style questions on Edexcel GCSE Chemistry 3.1 States of matter, covering 3.1.1 The three states of matter and changes of state. Each one has a worked solution and a mark scheme showing where the marks go.