A student in a Barbados laboratory investigated the reaction between dilute hydrochloric acid and marble chips at different temperatures. She observed that the reaction was faster at higher temperatures. According to collision theory, which of the following BEST explains this observation?

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Question

A student in a Barbados laboratory investigated the reaction between dilute hydrochloric acid and marble chips at different temperatures. She observed that the reaction was faster at higher temperatures. According to collision theory, which of the following BEST explains this observation?

Accepted Answer

At higher temperatures, particles move faster and collide more frequently with greater energy — Award 1 mark for recognizing that higher temperature increases both collision frequency and collision energy. B is incorrect — temperature does not change concentration. C is incorrect — solubility is not the primary factor affecting reaction rate in this context. D is incorrect — activation energy is a fixed value for a given reaction and does not change with temperature.

Answer

At higher temperatures, the concentration of the acid increases

Answer

At higher temperatures, the marble chips become more soluble

Answer

At higher temperatures, particles move faster and collide more frequently with greater energy

Answer

At higher temperatures, the activation energy of the reaction decreases

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