Question detail
Explain how increasing the concentration of a reactant affects the rate of reaction.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Rate of reaction
Question
Explain how increasing the concentration of a reactant affects the rate of reaction.
Answer
Increasingthe concentration of a reactant typically increases the rate of reaction because it raises the number of particles in a given volume. This leads to more frequent collisions between reactant particles, which increases the likelihood of successful reactions.
Explanation
This question assesses the student's ability to apply their knowledge of collision theory to explain the effect of concentration on reaction rates. A stronganswer connects concentration changes to collision frequency.
Common mistake
Misidentifying the rate unit
Students often write the rate of reaction as g s⁻¹ or mol s⁻¹ but forget to include the correct unit for the quantity used (e.g. g s⁻¹ for mass change, cm³ s⁻¹ for volume change, or mol s⁻¹ for moles).
Always pair the rate with the appropriate unit that matches the measured quantity: if you are using mass, use g s⁻¹; if volume, use cm³ s⁻¹; if moles, use mol s⁻¹. Write the unit as a fraction (e.g., g s⁻¹) rather than a product (g s).
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