Recent questions in Chemistry Form 3

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1 answer

The diagram below shows a set-up that can be used to obtain nitrogen gas in an experiment.

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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1 answer

The diagram below represents the extraction of sulphur by Frasch process

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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2 answers

Explain how you would show chemically that a given gas is ammonia.

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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1 answer

20cm3 of oxygen diffused through a porous partition in 70s .how long would it take 20cm3. Of sulphur VI oxide to diffuse through the same portion under the same condition.

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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1 answer

The rate of diffusion of neon was found to be 1.45 times faster than that of an equa! volume of gas X at room temperature. Determine the relative formula mass of gas X (Ne = 20.0).

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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1 answer

A compound W consist of 26.7%carbon, 2.2% hydrogen and the rest oxygen. It has a relative formula Mass of 90(C=12, H=1, O=16,)

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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1 answer

A fixed mass of a gas has a volume of 200cm3 at a temperature of 47°C and 750mmHg. Calculate the volume the gas would occupy at 7°C and 750mmHg pressure.

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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1 answer

Name the two allotropes of sulphur.

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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1 answer

Use the following information to answer the questions that follow:

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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1 answer

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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1 answer

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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1 answer

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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1 answer

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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2 answers

State Gay-Lussac’s law

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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1 answer

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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1 answer

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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