The set up below was used to collect a dry sample of a gas.

Give two reasons why the set up cannot be used to collect carbon (IV) oxide gas.

Answer:

- Carbon (IV) oxide gas is denser than air.
- Carbon (IV) oxide will react with calcium oxide since Carbon (IV) oxide is
acidic and calcium oxide is basic.

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in an experiment, soap solution was added to three separate samples of water. The table below shows the volumes of the soap solutions required to form lather with #1000cm^3# of each sample of water before and after boiling. a) Which water sample is likely to be soft? Explain. (b) Name the cause of change in the volume of soap solution used in sample III (Answered)
in an experiment, soap solution was added to three separate samples of water. The table below shows the volumes of the soap solutions required to form lather with #1000cm^3# of each sample of water before and after boiling. a) Which water sample is likely to be soft? Explain. (b) Name the cause of change in the volume of soap solution used in sample III .
Posted On:Tue 2, March 2021 05:57:59 am

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Posted On:Tue 2, March 2021 06:02:45 am

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What would be observed if soap solution was added dropwise to a sample of the water after the addition of the calcium hydroxide? Give a reason. (Answered)
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Posted On:Sat 6, March 2021 11:49:14 am

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Study the information in the table and answer the question below the table. Describe how a solid sample of substance A could be obtained from a solid mixture of A and B (Answered)
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Posted On:Sat 6, March 2021 12:24:30 pm

A sample of water drawn from a river passing through an agricultural district was divided into two portions. The first portion gave a white precipitate when acidified barium chloride was added. The second portion when warmed with aqueous sodium hydroxide gave a colourless gas which turned a moist red litmus paper blue. (a) Identify the ions present in the river water. (b) Suggest the possible (Answered)
A sample of water drawn from a river passing through an agricultural district was divided into two portions. The first portion gave a white precipitate when acidified barium chloride was added. The second portion when warmed with aqueous sodium hydroxide gave a colourless gas which turned a moist red litmus paper blue. (a) Identify the ions present in the river water. (b) Suggest the possible .
Posted On:Sat 6, March 2021 12:29:38 pm

Distinguish between a strong and a weak acid. Give an example of each. (Answered)
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The column below was used to soften hard water (i) Explain how hard water was soften as it passed through the column. (ii) After sometime the material in the column is not able to soften hard water. How can the material be reactivated? (b) Give one advantage of using hard water for domestic purposes. (Answered)
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Posted On:Sat 6, March 2021 13:07:10 pm

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Sample solutions of salts were labeled as I, II, III and IV. The actual solutions, not in that order , are lead nitrate, zinc sulphate, potassium chloride and calcium chloride. (a) When aqueous sodium carbonate was added to each sample separately, a white precipitate was formed in I, III and IV only. Identify solution II. (b) When excess aqueous sodium was added to each sample separately, a white (Answered)
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a) What method can be used to separate a mixture of ethanol and propanol? (b) (i) Explain how a solid mixture of sulphur and sodium chloride can be separated into solid sulphur and solid sodium chloride. (ii) How can one determine if the solid sulphur is pure? (c) The table below gives the solubilities of potassium bromide and potassium sulphate at #0^0C# and #40^0C# (Answered)
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The following tests were carried out on three separate portions of a colourless solution R. (a) From the information in test (i), name a cation which is not present in solution (b) Identify a cation, which is likely to be present in solution S (c) Write an ionic equation for the reaction which takes place in test(ii) (Answered)
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Posted On:Sat 6, March 2021 14:51:34 pm

Give a reason why calcium hydroxide solution is used to detect the presence of carbon (IV) oxide gas while sodium hydroxide is not (Answered)
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Posted On:Thu 11, March 2021 20:25:48 pm

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The set up below was used to collect a dry sample of a gas. Give two reasons why the set up cannot be used to collect carbon (IV) oxide gas.

The set up below was used to collect a dry sample of a gas.

Give two reasons why the set up cannot be used to collect carbon (IV) oxide gas.