Recent questions without a selected answer

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State three factors that increase the rate of reaction for the following reaction.

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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The empirical formula of a hydrocarbon is C2H3. The hydrocarbon has a relative molecular Mass of 54. (H = 1, C = 12)

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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The diagram below represents paper chromatogram of four types of sugar.

asked Aug 17, 2021 in Chemistry Form 1 by anonymous

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Below is a cross- section of a charcoal burner

asked Aug 17, 2021 in Chemistry Form 2 by anonymous

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An element F has a relative atomic mass of 88. When a current of 0.5 amperes was persed through the fused chloride of F for 20 minutes and 20 seconds, 0.278g of F were deposited at the cathode. Determine the charge on ion of F (1Faraday = 9650ºC).

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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What is a binary electrolyte.

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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Explain why concentrated Sulphuric (VI) acid is a poor electrolyte and has no effect on blue litmus paper whereas 2M Sulphuric (VI) acid conducts electricity and changes blue litmus paper red.

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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The solubility of Potassium Manganate (VII) at 20ºC is 13g per 100g of water and at 90ºC is 60g per 100g of water.

asked Aug 17, 2021 in Chemistry Form 1 by anonymous

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What is an alkali

asked Aug 17, 2021 in Chemistry Form 1 by anonymous

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A white solid dissolve in water to form a colourless solution. The colourless solution forms a white precipitate with Ammonia solution but dissolve in excess alkali. The colourless solution forms a white precipitate with Lead (II) Nitrate solution. The white Precipitate dissolve on warming to form a colourless solution.

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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Name the compound below

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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Name a compound that causes temporary hardness of water.

asked Aug 17, 2021 in Chemistry Form 2 by anonymous

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Lime water is also used to soften hard water. Why is this method not preferred to soften hard water.

asked Aug 17, 2021 in Chemistry Form 2 by anonymous

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The apparatus shown below was used to investigate the effect of Carbon (II) Oxide on Lead (II) Oxide.

asked Aug 17, 2021 in Chemistry Form 1 by anonymous

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Hydrogen Sulphide gas was bubbled into two solutions of metallic nitrates as shown in the flow diagram below

asked Aug 17, 2021 in Chemistry Form 2 by anonymous

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When a solid B was heated in a test-tube, it gave off two gases. The two gases were separated by passing them through a plug of glass wool in a test-tube as shown below.

asked Aug 17, 2021 in Chemistry Form 1 by anonymous

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A solution contains 29.1g per litre of aluminium Sulphate. Calculate the number of Sulphate ions in 350cm3 of the solution.(Al = 27, S = 32, O = 16) Avogadro’s constant = 6.0 x 1023.

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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When magnesium is burnt in air it reacts with both oxygen and nitrogen gas giving a white ash. Write two equations for the reactions that take place.

asked Aug 17, 2021 in Chemistry Form 1 by anonymous

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Determine the number of neutrons in 1818O

asked Aug 17, 2021 in Chemistry Form 2 by anonymous

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What are isotopes?

asked Aug 17, 2021 in Chemistry Form 2 by anonymous

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