Question detail
A 0.080 mol solution is made by dissolving the solute in 400 mL of water. What is the concentration in mol dm⁻³?
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. 0.20 moldm³
- B. 0.20 mol/dm³
- C. 0.20 mol/dm3
- D. A related idea from the topic but not the answer to this question
Answer
The correct option is 0.20 moldm³.
Explanation
The correct option is "0.20 moldm³" because it supports the approved learning objective: Explain that increasing concentration increases collision frequency in solutions. The other options are incorrect or weaker because they are vague, use the wrong Chemistry context, or do not clearly explain the answer for Collision theory and activation energy.
Common mistake
Misunderstanding Concentration Effects
Students often think that increasing concentration only increases the amount of reactants without affecting the rate of reaction.
Emphasize that increasing concentration increases the number of particles in a given volume, leading to more frequent collisions and thus a higher reaction rate.
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