Put copper turning in a combustion tube and heat them strongly.pass oxygen over the heated copper turning .The copper reacts with oxygen to form black copper (ii) oxide.After allowing the copper (ii)oxide to cool,Add it to suphuric acidin a beaker.Stir,filter and obtain the filtrate in an evaporating dish.Heat till it is saturated.test the solution by dipping a cleans glass rod and exposing it to the air.If crystals are formed,then poor the solution in a clean beaker and allow it to cool.Filter the crystals,wash them with distilled water and then place them between filter papers to dry
isaacmuthini answered the question on October 6, 2017 at 12:17
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When lead nitrate and sodium sulphate react, a white precipitate is formed. (i)Identify the white precipitate.(ii) Write an ionic equation of the reaction
(Solved)
When lead nitrate and sodium sulphate react, a white precipitate is formed. (i)Identify the white precipitate.(ii) Write an ionic equation of the reaction
Date posted:
October 5, 2017
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Answers (1)
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Starting with copper metal, describe how you can prepare solid copper (ii) carbonate
(Solved)
Starting with copper metal, describe how you can prepare solid copper (ii) carbonate
Date posted:
October 5, 2017
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Answers (1)
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What observation will be made when a few drops of concentrated sulphuric (VI) acid are added to crystals of sugar? Explain your answer
(Solved)
What observation will be made when a few drops of concentrated sulphuric (VI) acid are added to crystals of sugar? Explain your answer
Date posted:
October 4, 2017
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Answers (1)
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Explain one way in which sulphur (IV) oxide is a pollutant
(Solved)
Explain one way in which sulphur (IV) oxide is a pollutant
Date posted:
October 4, 2017
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Answers (1)
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The molar enthalpy of neutralisation between hydrochloric acid and ammonia solution was found to be -52.2 kj mol4, while that of hydrochloric acid and...
(Solved)
The molar enthalpy of neutralisation between hydrochloric acid and ammonia solution was found to be -52.2 kj mol4, while that of hydrochloric acid and sodium hydroxide was 57.1 kJ mol-1. Explain the difference in these values.
Date posted:
October 4, 2017
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Answers (1)
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What is meant by the term 'Enthalpy of formation'?
(Solved)
What is meant by the term 'Enthalpy of formation'?
Date posted:
October 4, 2017
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Answers (1)
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Element M reacts with water at room temperature to produce 0.2 dm3 of gas. Determine the mass of M which was...
(Solved)
Element M reacts with water at room temperature to produce 0.2 dm3 of gas. Determine the mass of M which was reacted with water. (Molar gas volume at room temperature is 24 dm3, Relative atomic mass of M = 7).
Date posted:
October 4, 2017
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Answers (1)
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A solution was made by dissolving 8.2g of calcium nitrate to give 2 litres of solution. (Ca = 40.0; N = 14.0;...
(Solved)
A solution was made by dissolving 8.2g of calcium nitrate to give 2 litres of solution. (Ca = 40.0; N = 14.0; O = 16.0).
Determine the concentration of nitrate ions in moles per litre
Date posted:
October 4, 2017
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Answers (1)
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When 15cm3 of a gaseous hydrocarbon, P, was burnt in 100cm3 of oxygen, the resulting gaseous mixture occupied 70cm3 at room temperature and pressure....
(Solved)
When 15cm^3 of a gaseous hydrocarbon, P, was burnt in 100cm^3 of oxygen, the resulting gaseous mixture occupied 70cm^3 at room temperature and pressure. When the gaseous mixture was passed through potassium hydroxide solution, its volume decreased to 25cm^3.
(a) What volume of oxygen was used during the reaction?
Date posted:
October 4, 2017
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Answers (1)
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Name two ores from which copper is extracted
(Solved)
Name two ores from which copper is extracted
Date posted:
October 4, 2017
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Answers (1)
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A certain mass of gas occupies 146 dm^3 at 291 K and 98.31 kPa. What will be...
(Solved)
A certain mass of gas occupies 146 dm^3 at 291 K and 98.31 kPa. What will be its temperature if its volume is reduced to 133 dm^3 at 101.325 kPa?
Date posted:
October 4, 2017
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Answers (1)
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A gas jar full gas V was opened in air. Explain the observation made by use of an equation.
(Solved)
A gas jar full gas V was opened in air. Explain the observation made by use of an equation.
Date posted:
October 3, 2017
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Answers (1)
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what is evaporation?
(Solved)
paper two.
Date posted:
October 2, 2017
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Answers (1)
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What is boiling?
(Solved)
What is boiling?
Date posted:
October 2, 2017
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Answers (1)
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Define the term saturated solution
(Solved)
What is a saturated solution?
Date posted:
October 2, 2017
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Answers (1)
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Give a reason why nitric (V) acid is stored in dark brown bottles.
(Solved)
Give a reason why nitric (V) acid is stored in dark brown bottles.
Date posted:
September 30, 2017
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Answers (1)
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State one use of sodium carbonate
(Solved)
State one use of sodium carbonate
Date posted:
September 30, 2017
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Answers (1)
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What is meant by the term dynamic equilibrium?
(Solved)
What is meant by the term dynamic equilibrium?
Date posted:
September 29, 2017
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Answers (1)
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a) Name the following processes (i) When anhydrous calcium chloride was left in an open beaker
overnight a solution was formed.(ii) When sodium carbonate decahydrate crystals...
(Solved)
a) Name the following processes:
i) When anhydrous calcium chloride was left in an open beaker
overnight a solution was formed.
ii) When sodium carbonate decahydrate crystals are left in an open beaker for some days it turned
into powder.
Date posted:
September 29, 2017
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Answers (1)
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Explain why the error in the Dalton's theory has not affected its validity?
(Solved)
Explain why the error in the Dalton's theory has not affected its validity?
Date posted:
September 29, 2017
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Answers (1)