A student is measuring the boiling point of some liquids using the experimental setup shown below:
She measures the boiling point of ethanol, hexane, and octacosane.
a.[2]
The student's method is not safe. Explain why it is not safe and explain how she could improve her method to make it safer.
b.
[2]
The student looks up some data on the melting points and boiling points of some hydrocarbons:
| Substance | Formula | Melting point (∘C^{\circ}\text{C}∘C) | Boiling point (∘C^{\circ}\text{C}∘C) | State at 20 ∘C20\ ^{\circ}\text{C}20 ∘C |
|---|---|---|---|---|
| Propane | C3H8\text{C}_3\text{H}_8C3H8 | −188-188−188 | −42-42−42 | ……………………\dots\dots\dots\dots\dots\dots\dots\dots…………………… |
| Hexane | C6H14\text{C}_6\text{H}_{14}C6H14 | −95-95−95 | 696969 | ……………………\dots\dots\dots\dots\dots\dots\dots\dots…………………… |
| Octacosane | C28H58\text{C}_{28}\text{H}_{58}C28H58 | 616161 | 432432432 | Solid |
Complete the table to show the states of propane and hexane at 20 ∘C20\ ^{\circ}\text{C}20 ∘C.
c.[2]
Hexane burns completely in oxygen, O2\text{O}_2O2. Carbon dioxide and water are made. Write a balanced symbol equation for this reaction.