Waec Model Questions Vol1 2018 Mathematics Question 10

Practice essay / theory question 10 from the 2018 Waec Model Questions Vol1 Mathematics examination. This question covers Variation .

Waec Model Questions Vol1 2018 Mathematics Essay / Theory

Topic: Variation

Question 10 WAEC_MODEL_QUESTIONS_VOL1 • 2018 • MATHEMATICS • essay

The time t (in seconds) taken for a certain chemical reaction to complete varies directly with the square of the concentration c (in mol L⁻¹) of a catalyst and inversely with the absolute temperature T (in K). When c = 0.20 mol L⁻¹ and T = 300 K the reaction requires 120 s.

Question Parts

( a )

Find the constant of variation k.

( b )

If the temperature is raised to 350 K and the catalyst concentration is increased to 0.25 mol L⁻¹, determine the new reaction time (to the nearest second).

( c )

The laboratory wishes the reaction to finish in under 90 s while keeping the temperature at 350 K. Determine the minimum catalyst concentration required, giving your answer to two decimal places.

( d )

Discuss qualitatively how the reaction time would change if both the temperature and the catalyst concentration were doubled from the values in part (b).

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About This Question

This is Waec Model Questions Vol1 2018 Mathematics Question 10. It is one of the essay questions from the 2018 Waec Model Questions Vol1 Mathematics examination.

The question covers Variation .

View More Waec Model Questions Vol1 2018 Mathematics Questions More Waec Model Questions Vol1 Practice Questions Back to Questions

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