c.form-three-chemistry-topical-quiz_1
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DATE 06 Dec 2025
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Document Type: This is a Study Notes, designed for Reviewing core curriculum material.
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KCSE CHEMISTRY FORM THREE TOPICAL GOLDLITE ONLINE SERVICES FORM THREE CHEMISTRY TOPICAL QUESTIONS GAS LAWS (15 LESSONS) 1. (a) State Graham‟s law of diffusion. (b) Two gases A and B have relative densities of 1. They diffuse under the same conditions. (i) Compare their rates of diffusion (1 mark) (ii) Determine the relative molecular mass of A, given that the relative molecular mass of B is 64. 600cm³ of oxygen gas diffused through a porous hole in 50 seconds. How long will it take 80cm³ of sulphur (IV) oxide to diffuse through the same hole under the same conditions (S = 32, O = 16). (a) (b) State the Graham’s law of diffusion. (1 mark) Two gases A and B diffuse in the ratio 2: 1 if the molecular mass of gas A is 16g, find the molecular mass of B. (2 marks) (a) State Charles‟ Law. (1mk) (b) The volume of a sample of nitrogen gas at a temperature of 298k and 600 minHg pressures was 4.
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KCSE CHEMISTRY FORM THREE TOPICAL GOLDLITE ONLINE SERVICES FORM THREE CHEMISTRY TOPICAL QUESTIONS GAS LAWS (15 LESSONS) 1. (a) State Graham‟s law of diffusion. (b) Two gases A and B have relative densities of 1.98 and 2.90 respectively. They diffuse under the same conditions. (i) Compare their rates of diffusion (1 mark) (ii) Determine the relative molecular mass of A, given that the relative molecular mass of B is 64. (2 marks) 2. 600cm³ of oxygen gas diffused through a porous hole in 50 second...
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