Add sulphuric acid to the mixture. Copper(II) oxide, a black solid and dilute sulfuric acid react to produce copper(II) sulfate, yielding a characteristic blue colour to the solution.Copper does not react with dilute sulphuric acid as its reduction potential is higher than that of hydrogen and therefore, does not displace hydrogen from dilute H2SO4.Filter the mixture to obtain copper turning as the residue and copper ii sulphate as the filtrate.Wash the residue to obtain pure copper and dry it between filter papers.
Mr Masinde answered the question on May 5, 2018 at 08:08
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A solution of tetrachloromethane burns colourless when propene gas is bubbled through it . What type of reaction takes place?
(Solved)
A solution of tetrachloromethane burns colourless when propene gas is bubbled through it. What type of reaction takes place?
Date posted:
May 1, 2018
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Answers (1)
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Suggest a reason why BaSO4(a pigment made from sulphuric acid) would be
suitable in making paint for cars.
(Solved)
Suggest a reason why BaSO4(a pigment made from sulphuric acid) would be
suitable in making paint for cars.
Date posted:
April 29, 2018
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Answers (1)
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Nitric v acid is manufactured by catalytic oxidation of ammonia gas (a) Name two raw materials other than ammonia that are used to manufacture the acid.....
(Solved)
Nitric v acid is manufactured by catalytic oxidation of ammonia gas
a. Name two raw materials other than ammonia that are used to manufacture the acid
b. Name the catalyst used.
c. Write an equation for reaction between nitric v acid and ammonia gas
d. sate one use of product in c
Date posted:
April 24, 2018
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Answers (1)
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A mixture contains iron(III)chloride, zinc(II)oxide and potassium chloride. Describe how each of the substance can be obtained from the mixture
(Solved)
A mixture contains iron(III)chloride,zinc(II)oxide and potassium chloride. Describe how each of the substance can be obtained from the mixture.
Date posted:
April 23, 2018
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Answers (1)
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Substance Q has a melting point of 15°C and boiling point of 70°c.
(a)On the same axis,draw the melting point and boiling point graph for Q...
(Solved)
Substance Q has a melting point of 15°C and boiling point of 70°c.
(a)On the same axis,draw the melting point and boiling point graph for Q and the room temperature.
(b)State the physical state of substance Q at room temperature.
Date posted:
April 22, 2018
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Answers (1)
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Explain why ammonium trioxocarbonate (iv) leaves no residue when heated
(Solved)
Explain why ammonium trioxocarbonate (iv) leaves no residue when heated
Date posted:
April 22, 2018
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Answers (1)
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Write chemical equation for reaction between dry hydrogen gas and heated lead (ii) oxide
(Solved)
Write chemical equation for reaction between dry hydrogen gas and heated lead (ii) oxide.
Date posted:
April 21, 2018
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Answers (1)
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Given the following reagents describe how to prepare lead (ii) sulphate, Solid potassium sulphate, solid lead (ii) carbonate, dilute nitric (iv) acid and distilled water.
(Solved)
Given the following reagents describe how to prepare lead (ii) sulphate: Solid potassium sulphate, solid lead (ii) carbonate, dilute nitric (iv) acid and distilled water.
Date posted:
April 19, 2018
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Answers (1)
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What are the advantages of universal indicators over other acid-base indicators?
(Solved)
What are the advantages of universal indicators over other acid-base indicators?
Date posted:
April 19, 2018
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Answers (1)
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A crystal of copper (II) sulphate was placed in a beaker of water. The beaker was left standing for two days without shaking. State and...
(Solved)
A crystal of copper (II) sulphate was placed in a beaker of water. The beaker was left standing for two days without shaking. State and explain the observations that were made.
Date posted:
April 17, 2018
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Answers (1)
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Explain how the hotness of a bunsen burner flame can be increased
(Solved)
Explain how the hotness of a bunsen burner flame can be increased.
Date posted:
April 17, 2018
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Answers (1)
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Explain why it is not advisable to store a solution of cadmium nitrate in a container made of zinc
(Solved)
Explain why it is not advisable to store a solution of cadmium nitrate in a container made of zinc.
Date posted:
April 17, 2018
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Answers (1)
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Dry ammonia gas is passed over heated lead(II) oxide in a combustion tube.
a) What observation would be made in the combustion tube
b) Outline a chemical...
(Solved)
Dry ammonia gas is passed over heated lead(II) oxide in a combustion tube.
a) What observation would be made in the combustion tube
b) Outline a chemical test you would use to identify the colourless liquid collected in the u-tube
c) Name the colourless liquid
d) Write an equation for the reaction between ammonia and lead(II)oxide
Date posted:
April 17, 2018
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Answers (1)
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Name the method that can be used to obtain pure iron (III) chloride from a mixture of iron (III) chloride and sodium chloride
(Solved)
Name the method that can be used to obtain pure iron (III) chloride from a mixture of iron (III) chloride and sodium chloride.
Date posted:
April 14, 2018
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Answers (1)
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Calculate the number of moles of molecules in 7.30g of HCL
(Solved)
Calculate the number of moles of molecules in 7.30g of HCL
Date posted:
April 12, 2018
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Answers (1)
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Starting with lead oxide, describe how you can prepare lead chloride.
(Solved)
Lead chloride is an insoluble salt so it is prepared by double decomposition. So basically we must come up with a soluble salt from the lead oxide, the mix it with another soluble chloride to form the lead chloride.
Date posted:
April 12, 2018
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Answers (1)
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Starting with lead(ii)oxide, describe how you would prepare a solid sample of lead (ii)chloride
(Solved)
Starting with lead(ii)oxide, describe how you would prepare a solid sample of lead (ii)chloride.
Date posted:
April 11, 2018
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Answers (1)
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Fraction distillation of liquid air usually produces nitrogen and oxygen as the major products
1. Name one substance that is used to remove carbon dioxide...
(Solved)
Fraction distillation of liquid air usually produces nitrogen and oxygen as the major products
1. Name one substance that is used to remove carbon dioxide from the air before it is changed into liquid
2. Describe how nitrogen gas is obtained from the liquid air (boiling points nitrogen = -196 degrees oxygen =-183 degrees
Date posted:
April 10, 2018
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Answers (1)
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Explain how you would separate a mixture of nitrogen and oxygen given that their boiling points are -196^0c and 183^0c
(Solved)
Explain how you would separate a mixture of nitrogen and oxygen given that their boiling points are -196^0c and 183^0c.
Date posted:
April 10, 2018
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Answers (1)
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Carbon and silicon belong to the same group of the periodic table yet carbon (4) oxide is a solid with a high melting point. Explain...
(Solved)
Carbon and silicon belong to the same group of the periodic table yet carbon (4) oxide is a solid with a high melting point. Explain this difference
Date posted:
April 6, 2018
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Answers (1)