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The student determined the rate of the reaction at regular time intervals during an experiment.Explain why the rate decreased during the reaction. You should give your answer in terms of particles. __

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RolandProfessional · Tutor for 6 years

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The rate of the reaction decreases during the reaction because as the reactants transform into products, there is a reduction in the concentration of the reactants. This lower concentration means fewer effective collisions among reactive particles, leading to a slowdown in the overall reaction rate.

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The rate of chemical reactions generally decreases over time. This phenomenon has a logical explanation in the context of particle theory. First, a chemical reaction occurs when particles (atoms, ions, molecules, etc.) collide with each other with enough energy. This is often called an effective collision. Most often, these initial collisions occur when there is a high concentration of particles - typically at the start of a reaction, causing a high reaction rate initially. The rule we need to remember here is that a higher concentration of substances leads to more effective collisions per unit of time, leading to a higher reaction rate. As the reaction progresses, the number of particles of the reactants (the starting materials in the reaction) decreases because they are being converted to the products of the reaction. This decrease in the count or concentration of reactant particles means there are fewer particles available to collide, and thus less effective collisions per unit of time. This leads to a decreasing rate of reaction over time.

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Question

The student determined the rate of the reaction at regular time intervals during an experiment.Explain why the rate decreased during the reaction. You should give your answer in terms of particles. __

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