Recent questions

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60cm3 of oxygen diffuses through a porous pot in 50 seconds. How long would it take 60cm3 of oxygen gas diffuses through a porous pot in 50sec.How long would it take 60cm3 of Sulphur (iv) oxide to diffuse through the same pot under the same conditions?

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

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4 answers

The diagram below represents part of the periodic table use it to answer the questions that follow.

asked Aug 4, 2021 in Chemistry Form 2 by anony mous

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1 answer

asked Aug 4, 2021 in Chemistry Form 1 by anony mous

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1 answer

Briefly outline how you would obtain ethanol from a mixture of ethanol and water.

asked Aug 4, 2021 in Chemistry Form 1 by anony mous

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1 answer

The diagram shows PH values for several substances.

asked Aug 4, 2021 in Chemistry Form 1 by anony mous

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1 answer

Write balanced equations for the following reactions

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

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1 answer

Write down the formula of the following compounds

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

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1 answer

The graph below shows a curve obtained when water at 20℃ was heated for 15 mins.

asked Aug 4, 2021 in Chemistry Form 1 by anony mous

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1 answer

Determine the number of sodium ions contained in 25cm3 of 0.5M sodium carbonate solution [a=6.023 x 1023]

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

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1 answer

The diagram below represents a paper chromatograph for three brands of juices suspected to contain banned food colourings

asked Aug 4, 2021 in Chemistry Form 1 by anony mous

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1 answer

answer to electrical current passing through H2SO4 State and explain the change in mass that occur when following substances are separately heated in open crucibles [4 mks]

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

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1 answer

The diagram shows electric current passing through dilute sulphuric (iv)acid

asked Aug 4, 2021 in Chemistry Form 2 by anony mous

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1 answer

Write down an ionic equation for the reaction between dilute hydrochloric acid and calcium carbonate

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

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2 answers

Give two properties of aluminum that makes it very suitable for making cooking utensils

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

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1 answer

Explain how you would obtain solid sodium carbonate from a mixture of lead II carbonate and sodium carbonate.

asked Aug 4, 2021 in Chemistry Form 2 by anony mous

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1 answer

An oxide of element F has the formulaF2O5

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

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1 answer

The diagram shows the structures of two allotropes of carbon. Study them and answer the questions that follow

asked Aug 4, 2021 in Chemistry Form 2 by anony mous

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1 answer

20g of solid sodium hydroxide were dissolved in distilled water and made to 400cm3. 30cm3 of this solution required 27cm3 of dilute sulphuric (iv) acid for complete reaction. [Na=23 O=16 H=1] Determine

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

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1 answer

X+ is an ion with electronic configuration 2,8,8. Identify element X

asked Aug 4, 2021 in Chemistry Form 2 by anony mous

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1 answer

When 0.288g of an oxide of metal M was reduced using suitable reducing agent, 0.256 of pure metal was formed. Determine the empirical formula of the oxide of the metal M. [M=64 O=16]

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

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