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Bromine is a liquid at room temperature and vaporises readily - Edexcel - GCSE Chemistry Combined Science - Question 5 - 2022 - Paper 1
Question 5
Bromine is a liquid at room temperature and vaporises readily. Bromine has a simple molecular structure. Which row of the table shows the most likely melting and bo... show full transcript
Worked Solution & Example Answer:Bromine is a liquid at room temperature and vaporises readily - Edexcel - GCSE Chemistry Combined Science - Question 5 - 2022 - Paper 1
Step 1
Which row of the table shows the most likely melting and boiling points of bromine?
Answer
The most likely melting and boiling points of bromine can be determined by considering its molecular structure and properties. Given that bromine is a liquid at room temperature, we can eliminate rows that have melting points significantly higher than room temperature. The correct answer corresponds to Row B, which shows a melting point of -17 °C and a boiling point of 63 °C, as these values are consistent with bromine's behavior as a liquid at standard conditions.
Step 2
Explain why graphene will be a good conductor of an electric current.
Answer
Graphene is an excellent conductor of electricity due to its unique structure and properties. It consists of a single layer of carbon atoms arranged in a two-dimensional honeycomb lattice. This arrangement allows for the delocalization of electrons, which means that electrons can move freely across the graphene sheet. As a result, the ability of electrons to flow can produce an electric current with minimal resistance. Additionally, graphene has a high electron mobility, further enhancing its conductivity.