Figure 8 shows one molecule of a compound obtained from crude oil: H H H | | | H--C--C--C--H | | | H H H *Figure 8* (i) Give the names of the two elements in this molecule: (ii) What is the molecule in Figure 8? A an oxide B a chain molecule C a fullerene D a ring molecule (iii) What is the relative formula mass of the compound in Figure 8? (relative atomic masses: H = 1.0, C = 12) A 13 B 42 C 44 D 96 (b) Crude oil can be separated into different fractions - Edexcel - GCSE Chemistry - Question 5 - 2022 - Paper 1

The molecule depicted in Figure 8 is B, which is a chain molecule. This structure consists of carbon atoms connected in a linear arrangement.

To calculate the relative formula mass, we identify that the molecule has 3 carbon atoms and 8 hydrogen atoms.

Using the atomic masses:

• Hydrogen (H) = 1.0
• Carbon (C) = 12

The formula mass is calculated as follows:

$ext{Relative Formula Mass} = (3 imes 12) + (8 imes 1) = 36 + 8 = 44$

Thus, the answer is C, which is 44.

The appropriate lines connecting the fractions to their uses are:

• Fuel for aircraft: kerosene
• Fuel for ships: petrol
• Fuel for cars: bitumen
• Making plastic: bitumen
• Extracting iron: bitumen
• Making road surfaces: bitumen

For the test tube containing hydrogen chloride gas, the blue litmus paper will turn red due to the acidic nature of hydrogen chloride.

For the test tube containing sulfur dioxide gas, the blue litmus paper will also turn red, as sulfur dioxide can form sulfurous acid in solution, making the solution acidic as well.