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In which substance do covalent bonds break when it melts? A hexane B ice C iodine D silicon dioxide - AQA - A-Level Chemistry - Question 14 - 2021 - Paper 3
Question 14
In which substance do covalent bonds break when it melts? A hexane B ice C iodine D silicon dioxide
Worked Solution & Example Answer:In which substance do covalent bonds break when it melts? A hexane B ice C iodine D silicon dioxide - AQA - A-Level Chemistry - Question 14 - 2021 - Paper 3
Step 1
C: iodine
Answer
When iodine (I2) melts, covalent bonds between the iodine molecules are broken. Solid iodine consists of diatomic molecules held together by relatively weak van der Waals forces, and when the temperature increases to the melting point, these intermolecular forces are overcome, allowing the iodine to transition into a liquid form. Therefore, the correct answer is C: iodine.