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A compound has empirical formula C3H6O and relative formula mass of 116. Determine it’s molecular formula.(C = 12, H = 1, O = 16).
(Solved)
A compound has empirical formula C3H6O and relative formula mass of 116. Determine it’s molecular formula.(C = 12, H = 1, O = 16).
Date posted:
March 28, 2019
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Answers (1)
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The scheme below shows some reaction of salt. Study it and answer questions that follow.
(Solved)
The scheme below shows some reaction of salt. Study it and answer questions that follow.

(i) Write an equation for the reaction to show formation of gas P and solid X.
(ii) Give the name and formula of the complex ion responsible for the deep blue colour in the solution.
Date posted:
March 28, 2019
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Answers (1)
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Explain why potassium chloride conducts electricity in both the molten state and in aqueous solution whereas hydrogen chloride conducts electricity only in aqueous solution and...
(Solved)
Explain why potassium chloride conducts electricity in both the molten state and in aqueous solution whereas hydrogen chloride conducts electricity only in aqueous solution and not in gaseous state.
Date posted:
March 28, 2019
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Answers (1)
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An element E has relative atomic mass of 69.39. Given that the element has two isotopes of atomic masses 62.35 and 70.45, calculate the relative...
(Solved)
An element E has relative atomic mass of 69.39. Given that the element has two isotopes of atomic masses 62.35 and 70.45, calculate the relative abundance of each of the isotopes.
Date posted:
March 28, 2019
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Answers (1)
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Name the method of separation that can most suitably be used to separate the following mixtures.
(a) Gasoline from petroleum
(b) Benzoic acid and potassium carbonate
(c) Oil...
(Solved)
Name the method of separation that can most suitably be used to separate the following mixtures.
(a) Gasoline from petroleum
(b) Benzoic acid and potassium carbonate
(c) Oil from cashew nuts
Date posted:
March 28, 2019
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Answers (1)
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25.0cm3 of 0.12M potassium hydroxide solution required 30.0cm3 of a solution of a dibasic acid (H2Y) for complete neutralization. The acid contained 3.15g per 500cm3...
(Solved)
25.0cm3 of 0.12M potassium hydroxide solution required 30.0cm3 of a solution of a dibasic acid (H2Y) for complete neutralization. The acid contained 3.15g per 500cm3 solution.
Calculate:
(a) The molarity of the acid solution
(b) The relative formula mass of the acid.
Date posted:
March 28, 2019
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Answers (1)
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A Student in form four placed a thermometer in molten naphthalene at 850C and recorded the temperature and time until the naphthalene solidified. From the...
(Solved)
A Student in form four placed a thermometer in molten naphthalene at 850C and recorded the temperature and time until the naphthalene solidified. From the values obtained, the figure below was drawn.

(a) What name is given to such a figure?
(b) Which part of the figure represents the change of state of naphthalene?
(c)In terms of kinetic theory. Explain what happens to molecules along AB.
Date posted:
March 28, 2019
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Answers (1)
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The table below shows information about three solid substances A, B and C. Study it and answer the question that follow.
Describe how you will separate...
(Solved)
The table below shows information about three solid substances A, B and C. Study it and answer the question that follow.

Describe how you will separate the three solids from a mixture of the three.
Date posted:
March 28, 2019
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Answers (1)
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Calculate the volume of carbon (IV) oxide that would be produced if 15g of calcium carbonate reacted with 100cm³ of 2.0M hydrochloric acid (C =...
(Solved)
Calculate the volume of carbon (IV) oxide that would be produced if 15g of calcium carbonate reacted with 100cm³ of 2.0M hydrochloric acid (C = 12.0, O = 16.0, Ca = 40.0) molar gas volume = 24000cm³
Date posted:
March 28, 2019
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Answers (1)
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When lead (II) Carbonate is reacted with dilute sulphuric (VI) acid, the reaction takes place for a short time and then stops. Explain.
(Solved)
When lead (II) Carbonate is reacted with dilute sulphuric (VI) acid, the reaction takes place for a short time and then stops. Explain.
Date posted:
March 28, 2019
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Answers (1)
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Name the particles responsible for the electrical conductivity of:
(a) Graphite
(b) Magnesium Sulphate solution
(Solved)
Name the particles responsible for the electrical conductivity of:
(a) Graphite
(b) Magnesium Sulphate solution
Date posted:
March 28, 2019
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Answers (1)
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It is advisable to leave your flame in the luminous state when not in use. Give a reason why.
(Solved)
It is advisable to leave your flame in the luminous state when not in use. Give a reason why.
Date posted:
March 28, 2019
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Answers (1)
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The diagram below shows a non-luminous flame. Use it to answer the questions that follow:
(Solved)
The diagram below shows a non-luminous flame. Use it to answer the questions that follow:

Two wooden splints were placed across regions X and Y respectively. Draw labelled diagrams to show the effects observed on the wooden splint placed across each region.
(i) Region X.
(ii) Region Y.
Date posted:
March 28, 2019
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Answers (1)
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280cm³ of nitrogen gas diffuse through a porous plug in 70 seconds. How long will it take 400cm³ of carbon (IV) oxide gas to diffuse...
(Solved)
280cm³ of nitrogen gas diffuse through a porous plug in 70 seconds. How long will it take 400cm³ of carbon (IV) oxide gas to diffuse through the same porous plug. (C = 12, O = 16, N = 7).
Date posted:
March 28, 2019
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Answers (1)
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In an experiment, a jar containing sulphur (IV) oxide was inverted over another jar containing hydrogen sulphide gas.
(a) State and explain the observation that was...
(Solved)
In an experiment, a jar containing sulphur (IV) oxide was inverted over another jar containing hydrogen sulphide gas.
(a) State and explain the observation that was made.
(b) State two conditions necessary for the reaction to take place.
(c) Write an equation for the reaction
(d) What is the role of sulphur (IV) oxide in the reaction
Date posted:
March 28, 2019
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Answers (1)
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The diagram below represents a set-up used to prepare oxygen gas.
(Solved)
The diagram below represents a set-up used to prepare oxygen gas.

(a) Name substance Q.
(b) Complete the set-up to show how oxygen gas is collected.
(c) Write the equation for the reaction that occur.
Date posted:
March 28, 2019
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Answers (1)
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Describe briefly how potassium sulphate can be prepared using 50cm³ of 1M potassium hydroxide.
(Solved)
Describe briefly how potassium sulphate can be prepared using 50cm³ of 1M potassium hydroxide.
Date posted:
March 28, 2019
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Answers (1)
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Radioactive polonium – 216 decay as shown below.
(Solved)
Radioactive polonium – 216 decay as shown below.

Find the value of M and n.
Date posted:
March 28, 2019
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Answers (1)
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The flow chart below gives some reactions starting with ethane. Study it and answer the questions that follow.
(Solved)
The flow chart below gives some reactions starting with ethane. Study it and answer the questions that follow.

(a) Draw the structure of compounds:
P:
Q:
(b) Write the name of Compound R.
Date posted:
March 28, 2019
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Answers (1)
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The apparatus below was used to separate a mixture of liquid A and B.
(Solved)
The apparatus below was used to separate a mixture of liquid A and B.

(i) State two properties of the liquids that make it possible to separate them are using such apparatus.
(ii) Give the name of the above apparatus.
Date posted:
March 28, 2019
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Answers (1)