Question detail
What is the definition of the rate of reaction?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Rate of reaction
Question
- A. The speed at which reactants are used up or products are formed
- B. The total amount of reactants in a reaction
- C. The temperature at which a reaction occurs
- D. The pressure of the gases involved in a reaction
Answer
The speed at which reactants are used up or products are formed
Explanation
The correct answer is The speed at which reactants are used up or products are formed. This answer directly addresses the question: What is the definition of the rate of reaction? It matches the approved Chemistry 8462 learning objective and the linked subtopic. The other options are incorrect because they either change the rate, catalyst, reversible reaction, equilibrium, or graph context, or they do not answer the exact point being tested.
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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