(1)PbO(S)+CO(g)?Pb(s)+CO2(g)
(2)There was colour change from yellow to white/greyish.
(3)Carbon
Keziahndichu answered the question on April 20, 2019 at 12:31
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Describe tests for common cations in the laboratory.
(Solved)
Describe tests for common cations in the laboratory.
Date posted:
April 12, 2019
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Answers (1)
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Give the procedure,observation and conclusions for testing for the common anions in the laboratory.
(Solved)
Give the procedure,observation and conclusions for testing for the common anions in the laboratory.
Date posted:
April 12, 2019
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Answers (1)
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Give the procedure,observation and conclusions for testing of common gases in the laboratory.
(Solved)
Give the procedure,observation and conclusions for testing of common gases in the laboratory.
Date posted:
April 12, 2019
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Answers (1)
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Discuss the Fehling's test for reducing sugars.
(Solved)
Discuss the Fehling's test for reducing sugars.
Date posted:
April 12, 2019
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Answers (1)
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Describe the electrolysis of lead bromide.
(Solved)
Describe the electrolysis of lead bromide.
Date posted:
April 12, 2019
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Answers (1)
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Describe an experiment to estimate the size of an oil molecule.
(Solved)
Describe an experiment to estimate the size of an oil molecule.
Date posted:
April 12, 2019
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Answers (1)
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Describe how Oxygen gas is prepared,collected and tested in the laboratory.
(Solved)
Describe how Oxygen gas is prepared,collected and tested in the laboratory.
Date posted:
April 12, 2019
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Answers (1)
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Using a solid naphthalene as an example,describe how impurities affects the melting point of a substance.
(Solved)
Using a solid naphthalene as an example,describe how impurities affects the melting point of a substance.
Date posted:
April 12, 2019
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Answers (1)
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Explain how a burette is used.
(Solved)
Explain how a burette is used.
Date posted:
April 12, 2019
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Answers (1)
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Draw and name the apparatus used in the laboratory.
(Solved)
Draw and name the apparatus used in the laboratory.
Date posted:
April 12, 2019
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Answers (1)
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Describe an experiment to demonstrate the purity of water using boiling point.
(Solved)
Describe an experiment to demonstrate the purity of water using boiling point.
Date posted:
April 11, 2019
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Answers (1)
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State three examples of allotropes of carbon
(Solved)
State three examples of allotropes of carbon.
Date posted:
April 9, 2019
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Answers (1)
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Define the following terms as used in chemistry: atom,molecule, element and compound
(Solved)
Define the following terms as used in chemistry: atom,molecule, element and compound
Date posted:
April 9, 2019
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Answers (1)
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Describe how the mixture of sugar, iodine and lead (II) carbonate can be separated
(Solved)
Describe how the mixture of sugar, iodine and lead (II) carbonate can be separated.
Date posted:
April 9, 2019
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Answers (1)
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The diagram below shows an investigation on a property of ammonia gas.
(Solved)
The diagram below shows an investigation on a property of ammonia gas.

(a) The platinum wire is observed to glow. Explain the cause of that observation.
(b) State the observations made when the rubber bang is removed.
Date posted:
April 1, 2019
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Answers (1)
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The molar masses of gases W and X are 16.0 and 44.0 respectively. If the rate of diffusion of W through porous material is 12cm3s-1....
(Solved)
The molar masses of gases W and X are 16.0 and 44.0 respectively. If the rate of diffusion of W through porous material is 12cm3s-1. Calculate the rate of diffusion of X through the same material.
Date posted:
April 1, 2019
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Answers (1)
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The lattice energy of sodium bromide and hydration energies of sodium and bromide ions are:- 733, 406 and 335kJ/mol respectively.
(Solved)
The lattice energy of sodium bromide and hydration energies of sodium and bromide ions are:- 733, 406 and 335kJ/mol respectively.
(i) Complete the energy cycle diagram below by inserting the values of changeH1, changeH2 and changeH3.

(ii) Determine the molar heat of solution of solid sodium bromide.
Date posted:
April 1, 2019
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Answers (1)
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Using dots (.) and crosses (x), show bonding in:-Sodium oxide (Na = 11; O = 8 )
(Solved)
Using dots (.) and crosses (x), show bonding in:-Sodium oxide (Na = 11; O = 8 )
Date posted:
April 1, 2019
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Answers (1)
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Using dots (.) and crosses (x), show bonding in:The compound formed when nitrogen reacts with fluorine. (F = 9, N = 7)
(Solved)
Using dots (.) and crosses (x), show bonding in:The compound formed when nitrogen reacts with fluorine. (F = 9, N = 7)
Date posted:
April 1, 2019
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Answers (1)
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20.0cm3 of a solution containing 4gm per litre of sodium hydroxide was neutralized by
8.0cm3 of dilute sulphuric acid. Calculate the concentration of sulphuric acid in...
(Solved)
20.0cm3 of a solution containing 4gm per litre of sodium hydroxide was neutralized by
8.0cm3 of dilute sulphuric acid. Calculate the concentration of sulphuric acid in moles per litre.( Na = 23.0; O = 16.0; H = 1.0 )
Date posted:
April 1, 2019
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Answers (1)