Description
Two liquid compounds, A and B, have the same molecular weight. Samples of A & B were placed on temperature probes and allowed to evaporate, as in today's experimental procedure. After 105 seconds, Liquid A had a ΔT of 10.2ºC, and liquid B had a ΔT of 3.7ºC.
1. Which of the two liquids required more energy to overcome intermolecular attractions and evaporate? Explain your reasoning.
2. Which of the two liquids has higher intermolecular attractions? Explain your reasoning.
Explanation & Answer
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liquid B requires more energy to overcome the inter-molecular attractions. This is because for a liquid to evaporate or boil the intermolecular forces must be broken first. Since liquid B had a lower change in temperature this means that it has stronger intermolecular forces that are not easily overcome by heat.
As indicated liquid B has higher intermolecular forces since they require more energy to break
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