A student makes a model of a hydrocarbon. The model has two carbon atoms joined by one single covalent bond. One carbon atom is joined to two hydrogen atoms and the other carbon atom is joined to three hydrogen atoms. All the bonds in the model are single covalent bonds.
The student labels the model C2H5\mathrm{C_2H_5}C2H5 and says, "This model shows a complete molecule."
Each carbon atom has the electronic structure 2.4.
Explain whether the student is correct. Give the molecular formula of the molecule the model should show.
122 exam-style questions on OCR GCSE Chemistry 2.3 Properties of materials, covering 2.3.1 Carbon bonding and the variety of organic compounds, 2.3.2 Diamond, graphite, fullerenes and graphene, 2.3.3 Bond strength, changes of state and predicting states, 2.3.4 Bulk properties and types of bonding, and 2.3.5 Nanoparticles: scale, surface area, uses and risks. Each one has a worked solution and a mark scheme showing where the marks go.