Recent questions in Chemistry Form 3

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An organic compound J has the following percentage by mass, carbon 64.86%, hydrogen 13.51% and the rest is oxygen. The relative molecular mass of the compound is 74. C = 12, O = 16, H = 1)

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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Cracking can also be achieved using less amount of heat in the presence of a catalyst. Name one catalyst that is often used.

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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Sodium metal reacts with air to form two oxides. Give the formulae of the oxides.

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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State one use of C2H4.

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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A student in form three was given two gases C2H6 and C2H4. He added acidified Potassium Manganate (VII) to each solution. State the observations the student made.

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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The diagram below is used to prepare nitrogen (IV) oxide gas.

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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Given that the hydration energies of Ca2+(g) and Cl-(g) are -1562KJ/Mole and -364KJ/Mole respectively. The heat of solution (Hsoln) for one Mole of CaCl2 is -82.9 KJ/Mole. Determine the lattice energy for CaCl2.

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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10cm3 of a gaseous hydrocarbon, CxHy required 30cm3 of oxygen for complete combustion. If steam and 20cm3 of Carbon (IV) oxide were produced, what is the value of x in CxHy.

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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State Gay-Lussac’s law

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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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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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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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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what happens oxygen is mixed with hydrogen

asked Aug 16, 2021 in Chemistry Form 3 by realpalmer

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When Chlorine gas was bubbled through water the resulting solution act as a bleaching agent

asked Aug 4, 2021 in Chemistry Form 3 by anony mous

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When potassium Nitrate is heated, it produces potassium Nitrate and gas X

asked Aug 4, 2021 in Chemistry Form 3 by anony mous

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State Boyle’s Law

asked Aug 4, 2021 in Chemistry Form 3 by anony mous

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A certain mass of gas occupies 0.15dm3 at 20°c and 98,648.5pa, Calculate it volume at 101325pa and 0°c

asked Aug 4, 2021 in Chemistry Form 3 by anony mous

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In a experiment to determine the percentage of purity of a sample of sodium carbonate, 2.15g of the sample reacted completely with 40cm3 of 0.5m sulphuric (iv) acid

asked Aug 4, 2021 in Chemistry Form 3 by anony mous

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