3.1 Boiling point is the temperature at which a substance changes from a liquid to a gas.
3.2 The substance with the lowest boiling point is methane (CH4). This is because it has the lowest boiling point on the graph, indicating that it requires the least amount of heat energy to convert from a liquid to a gas.
3.3 The vapor pressure of NH3 (ammonia) is not provided in the graph, so it is not possible to determine the exact value.
QUESTION 3 [17 marks]
The graph below compares the boiling points between Group 4 and Group 5
hydrides. Study the graph and answer the questions that follow.
The Boiling Points of Group 5 and Group 4 Hydrides.
275
SbH,
250
NH,
SnH
225
AsH
Ž 200
GeH.
PH,
175
SiH,
150
125
CH4
100
3
4
5
Period
Figure 2: Graph of boiling points of hydrides.
Question 3.1 (2 marks)
Define boiling point.
3.2 substance with lowest vapor pressure, explain your answer
3.3 write the vapor pressure of NH3
1 answer