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A student tried to prepare aluminium carbonate by mixing a solution of aluminium chloride and a solution of sodium carbonate but did not succeed. Explain.
(Solved)
A student tried to prepare aluminium carbonate by mixing a solution of aluminium chloride and a solution of sodium carbonate but did not succeed. Explain.
Date posted:
April 1, 2019
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Answers (1)
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Phosphorus has an atomic number of 15. State the type of bond formed when phosphorous combines with bromine.
(Solved)
Phosphorus has an atomic number of 15. State the type of bond formed when phosphorous combines with bromine.
Date posted:
April 1, 2019
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Answers (1)
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Using oxidation numbers identify the oxidizing agent in the reaction below.
(Solved)
Using oxidation numbers identify the oxidizing agent in the reaction below.
Date posted:
April 1, 2019
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Answers (1)
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Would copper be suitable to prevent rusting in iron? Explain
(Solved)
Would copper be suitable to prevent rusting in iron? Explain.
Date posted:
April 1, 2019
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Answers (1)
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Filtration is usually carried out in the purification of water. Which other process would be required to obtain water for drinking?
(Solved)
Filtration is usually carried out in the purification of water. Which other process would be required to obtain water for drinking?
Date posted:
April 1, 2019
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Answers (1)
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a)A hydrocarbon decolourises both bromine gas and acidified potassium permanganate.Name and draw the structure of the fourth member of the series to which the hydrocarbon...
(Solved)
a)A hydrocarbon decolourises both bromine gas and acidified potassium permanganate.Name and draw the structure of the fourth member of the series to which the hydrocarbon belongs.
b)To which homologous series does (a) above belong to.
Date posted:
April 1, 2019
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Answers (1)
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The formula given below represents a portion of a polymer.
(Solved)
The formula given below represents a portion of a polymer.
(i) Give the name of the monomer.
(ii) State one disadvantage of continued use of the polymer.
(iii) State one use of the polymer.
Date posted:
April 1, 2019
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Answers (1)
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The table below shows the formulae of the chlorides of P, Q, R and S ( not the actual symbols )
(Solved)
The table below shows the formulae of the chlorides of P, Q, R and S ( not the actual symbols )
(i) State the group to which the elements belong.
P
Q
R
S
(ii) Which of the chlorides would conduct electricity when dissolved in water . Explain.
Date posted:
April 1, 2019
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Answers (1)
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The equilibrium reaction of phenolphthalein indicator in water may be represented as follows.
(Solved)
The equilibrium reaction of phenolphthalein indicator in water may be represented as follows.
State and explain the observations made when an acid is added to the equilibrium
mixture.
Date posted:
April 1, 2019
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Answers (1)
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Study the chart below and answer the questions that follow.
(Solved)
Study the chart below and answer the questions that follow.
(i) Identify metal ion present in solution M.
(ii) Give the formula of the complex ion in
I) Solution P
II) Solution N
Date posted:
April 1, 2019
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Answers (1)
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Draw the isomers of the compound C3H7Cl and give their systematic names.
(Solved)
Draw the isomers of the compound C3H7Cl and give their systematic names.
Date posted:
April 1, 2019
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Answers (1)
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What do you understand by the term isomers ?
(Solved)
What do you understand by the term isomers ?
Date posted:
April 1, 2019
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Answers (1)
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Calculate the mass of calcium carbonate that would react completely with 20cm3 of 0.2M hydrochloric acid (Ca = 40.0, C = 12.0, O = 16.0)
(Solved)
Calculate the mass of calcium carbonate that would react completely with 20cm 3 of 0.2M hydrochloric acid (Ca = 40.0, C = 12.0, O = 16.0)
Date posted:
April 1, 2019
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Answers (1)
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The following graph represents a thermochemical process
(Solved)
The following graph represents a thermochemical process
(a) What does Y represent.
(b) Is the overall reaction exothermic or endothermic. Explain your answer.
Date posted:
April 1, 2019
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Answers (1)
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Why is water not used to put off oil fires?
(Solved)
Why is water not used to put off oil fires?
Date posted:
March 29, 2019
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Answers (1)
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Suppose 180cm3 of a 2.0M solution is diluted to 1.0dm3. What will be the concentration of the resulting solution.
(Solved)
Suppose 180cm3 of a 2.0M solution is diluted to 1.0dm3. What will be the concentration of the resulting solution.
Date posted:
March 29, 2019
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Answers (1)
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Using the following standard electrode potentials to answer the questions that follow.
(Solved)
Using the following standard electrode potentials to answer the questions that follow.
Calculate the e.m.f of the following cell:
Date posted:
March 29, 2019
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Answers (1)
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The formula below represents the active ingredients in a soap and a detergent respectively.
(Solved)
The formula below represents the active ingredients in a soap and a detergent respectively.
(a)Explain why (I) is suitable for washing using water from a river.
(b) Give one advantage and one disadvantage of II.
Date posted:
March 29, 2019
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Answers (1)
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The diagram below shows the appearance of two pieces of paper placed in different parts of a non-luminous flame of a Bunsen burner and removed...
(Solved)
The diagram below shows the appearance of two pieces of paper placed in different parts of a non-luminous flame of a Bunsen burner and removed quickly before they caught fire.
(a) What do the experiments show about the outer region of the flame?
(b) From the above experiment, which part of the flame is better to use for heating? Give a reason
Date posted:
March 29, 2019
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Answers (1)
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Determine the mass left after 90 hours
(Solved)
The isotope decays
by Beta,-emission to a stable nuclide. The half-life of the isotope is 15 hours 2.0g of allowed to decay. Determine the mass left after 90 hours.
Date posted:
March 29, 2019
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Answers (1)