Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Displayed formulae
19 practice questions
Practice questions
11–19 of 19
Question 11
3 marks · Normal
Answer and see the solution →Methanol is a simple alcohol. Using your knowledge of typical bonding, calculate the total number of bonds present in a molecule of methanol ().
Question 12
3 marks · Normal
Answer and see the solution →Explain why alkanes with four or fewer carbon atoms can be represented with straight-chain displayed formulae, and why each carbon has four bonds.
Question 13
4 marks · Normal
Answer and see the solution →Displayed formulae and properties of small alkenes Molecule Displayed formula Ethene C = C with each C joined to 2 H Propene C = C - C with hydrogens to fill remaining bonds Butene C = C - C - C with hydrogens to fill remaining bonds Use the displayed formulae in the table to answer the questions.
(a)[1 mark]Identify the type of bond connecting the first two carbon atoms in all molecules.
(b)[2 marks]State the total number of single and double bonds in propene.
(c)[1 mark]Describe how the displayed formula helps you determine the locations of hydrogen atoms in butene.
Question 14
1 mark · Normal
Answer and check →In displayed formulae, what is the usual number of bonds formed by an oxygen atom?
- A.1
- B.2
- C.3
- D.4
Question 15
2 marks · Normal
Answer and see the solution →Draw the displayed formula for butanol ().
Question 16
4 marks · Normal
Answer and see the solution →The displayed formula below represents a simple alkene:
(a)[1 mark]Identify the name of this alkene.
(b)[2 marks]Explain how you used the displayed formula to identify the molecule.
(c)[1 mark]State the total number of hydrogen atoms in this molecule.
Question 17
2 marks · Hard
Answer and see the solution →Figure 1 shows the displayed formula of an organic molecule containing three carbon atoms.
Displayed formula of an organic molecule Describe how you can use this displayed formula to: (i) identify the connectivity (how atoms are joined together) and (ii) determine the types of bonds present in the molecule.
Question 18
5 marks · Hard
Answer and see the solution →Answer the following questions about typical bonding in displayed formulae of organic compounds.
(a)[1 mark]State the typical number of bonds formed by a carbon atom in a displayed formula.
(b)[1 mark]State the typical number of bonds formed by a hydrogen atom in a displayed formula.
(c)[1 mark]State the typical number of bonds formed by an oxygen atom in a displayed formula.
(d)[1 mark]State the typical number of bonds formed by a halogen atom (such as chlorine) in a displayed formula.
(e)[1 mark]Explain why a carbon atom in organic molecules always forms this number of bonds.
Question 19
2 marks · Hard
Answer and see the solution →Draw the displayed formula for ethene ([LaTeX][\ce{C2H4}]).