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Equal masses of calcium trioxocarbonate(iv) were added to dilute hydrochloric acid at the temperature specified....

Chemistry
WAEC 2020

Equal masses of calcium trioxocarbonate(iv) were added to dilute hydrochloric acid at the temperature specified. Under which of the following conditions would the reaction be slowest?

  • A. Calcium trioxocarbonate ( iv ) chips a 20°C
  • B. CalcIum trioxocarbonate (IV) chips at 40°C
  • C. Calcium trioxocarbonate (IV) powder at 20'C
  • D. Calcium trioxocarbonate (IV) powder at 40'C
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Correct Answer: Option A
Explanation

- Increasing the surface area of a reactant increases the frequency of collisions and increases the reaction rate.

- Chips have a lower surface area compared to powder, so it accounts for the slowest


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WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts