Add excess zinc oxide to dilute hydrochloric acid. Filter and to the filtrate, add aqueous sodium carbonate as residue
johnmulu answered the question on February 2, 2017 at 13:02
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When potassium nitrate is heated, it produces potassium nitrite and gas C1
(Solved)
When potassium nitrate is heated, it produces potassium nitrite and gas C1
a) Identify gas C1
b) Name the type of reaction undergone by the potassium nitrate
Date posted:
February 2, 2017
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Answers (1)
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How would you obtain a sample of pure iodine from a mixture of iodine and lead sulphate?
(Solved)
Explain how you would you obtain a sample of pure iodine from a mixture of iodine and lead sulphate.
Date posted:
February 2, 2017
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Answers (1)
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Starting with copper metal, describe how a solid sample of copper (II) carbonate can be prepared
(Solved)
Starting with copper metal, describe how a solid sample of copper (II) carbonate can be prepared
Date posted:
February 2, 2017
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Answers (1)
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Describe how a solid sample of lead (II) Chloride can be prepared using the following reagents; dilute nitric (V) acid, dilute hydrochloric acid and lead carbonate
(Solved)
Describe how a solid sample of lead (II) Chloride can be prepared using the following reagents; dilute nitric (V) acid, dilute hydrochloric acid and lead carbonate
Date posted:
February 2, 2017
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Answers (1)
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Explain how you would obtain solid sodium carbonate from a mixture of lead carbonate and sodium carbonate powders
(Solved)
Explain how you would obtain solid sodium carbonate from a mixture of lead carbonate and sodium carbonate powders.
Date posted:
February 2, 2017
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Answers (1)
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Describe how the following reagents can be used to prepare lead sulphate
(Solved)
Describe how the following reagents can be used to prepare lead sulphate. Solid potassium sulphate, solid lead carbonate, dilute nitric (V) acid and distilled water.
Date posted:
February 2, 2017
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Answers (1)
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Why is there is general increase in the first ionization energies of the elements in period 3 of the periodic table from left to right?
(Solved)
Explain why there is general increase in the first ionization energies of the elements in period 3 of the periodic table from left to right.
Date posted:
February 2, 2017
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Answers (1)
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Yellow phosphorous reacts with chlorine gas to form a yellow liquid. The liquid fumes when exposed to air. Explain these observations
(Solved)
Yellow phosphorous reacts with chlorine gas to form a yellow liquid. The liquid fumes when exposed to air. Explain these observations.
Date posted:
February 2, 2017
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Answers (1)
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Give a reason why phosphorus is stored under water
(Solved)
Explain why Phosphorous is stored under water
Date posted:
February 2, 2017
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Answers (1)
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Explain why anhydrous aluminium chloride is fairly soluble in organic solvent while anhydrous magnesium chloride is insoluble
(Solved)
Explain why anhydrous aluminium chloride is fairly soluble in organic solvent while anhydrous magnesium chloride is insoluble.
Date posted:
February 2, 2017
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Answers (1)
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A crystal of iodine, heated gently in a test gave off a purple vapour.
(Solved)
A crystal of iodine, heated gently in a test gave off a purple vapour.
a) Write the formula of the substance responsible for the purple vapour
b) What type of bond is broken when the iodine crystal is heated gently
c) state one use of iodine
Date posted:
February 2, 2017
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Answers (1)
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In terms of structure and bonding, explain the following observations
(Solved)
In terms of structure and bonding, explain the following observations
a) The melting point of aluminium is higher than that of sodium:
b) Melting point of chlorine is lower than that of sulphur
Date posted:
February 2, 2017
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Answers (1)
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Other than their location in the atom, name two other differences between an electron and a proton
(Solved)
Other than their location in the atom, name two other differences between an electron and a proton
Date posted:
February 2, 2017
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Answers (1)
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In terms of structure and bonding, explain why the melting point of oxygen is much lower than that of sodium.
(Solved)
In terms of structure and bonding, explain why the melting point of oxygen is much lower than that of sodium.
Date posted:
February 2, 2017
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Answers (1)
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Both chlorine and iodine are halogens (a) what are halogens
(Solved)
Both chlorine and iodine are halogens
a) what are halogens
b) In terms of structure and bonding, explain why the boiling point of chlorine is lower than that of iodine
Date posted:
February 2, 2017
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Answers (2)
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Distinguish between a covalent bond and co-ordinate bond
(Solved)
Distinguish between a covalent bond and co-ordinate bond.
Date posted:
February 2, 2017
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Answers (1)
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The atomic numbers of elements C and D are 19 and 9 respectively. State and explain the electrical conductivity of the compound CD in
(Solved)
The atomic numbers of elements C and D are 19 and 9 respectively. State and explain the electrical conductivity of the compound CD in
a) Solid state
b) Aqueous state
Date posted:
February 2, 2017
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Answers (1)
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With reference to iodine, distinguish between covalent bonds and Van Der Waals forces
(Solved)
With reference to iodine, distinguish between covalent bonds and Van Der Waals forces.
Date posted:
February 2, 2017
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Answers (1)
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Oxygen and sulphur belong to group (VI) of the periodic table. Explain why there is a big difference in their melting points (melting points of oxygen is -216oC) while that of sulphur is 44oC
(Solved)
Oxygen and sulphur belong to group (VI) of the periodic table. Explain why there is a big difference in their melting points (melting points of oxygen is -216oC) while that of sulphur is 44oC
Date posted:
February 2, 2017
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Answers (1)
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The melting point of phosphorus trichloride is - 91oC while that of magnesium chloride is 715oC.
(Solved)
The melting point of phosphorus trichloride is - 91oC while that of magnesium chloride is 715oC. In terms of structure and bonding, explain the difference in their melting points
Date posted:
February 2, 2017
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Answers (1)