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This question is about alkanes - AQA - GCSE Chemistry - Question 1 - 2021 - Paper 2
Question 1
This question is about alkanes. Table 1 shows information about some alkanes. | Number of carbon atoms in alkane molecule | Boiling point of alkane in °C | |------... show full transcript
Worked Solution & Example Answer:This question is about alkanes - AQA - GCSE Chemistry - Question 1 - 2021 - Paper 2
Step 1
Plot the data from Table 1 on Figure 2.
Answer
To correctly plot the data from Table 1, you will first need to identify the number of carbon atoms listed in the first column and their corresponding boiling points in the second column. Using this information, plot the points on Figure 2, ensuring that each point is accurately positioned according to the graph's scale.
Step 2
Predict the boiling point X of the alkane with seven carbon atoms in a molecule.
Answer
To predict the boiling point of the alkane with seven carbon atoms, observe the trend in the boiling points from Table 1. Noticing that there is a consistent increase in boiling point with the addition of carbon atoms, we can estimate that the boiling point for seven carbon atoms (X) is approximately 98°C based on the observed data.
Step 3
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Step 5
Explain why nonane will condense lower in a fractionating column during fractional distillation than the other alkanes in Table 1.
Answer
Nonane has a higher boiling point compared to the other alkanes listed in Table 1. In a fractionating column, nonane condenses at a lower position because it collects where the column has a higher temperature, which allows it to remain in vapor form longer than those with lower boiling points.