(a) A – Chlorine.
B – Hydrogen.
(b) H2(g) + Cl2---->2HCl(g)
maurice.mutuku answered the question on September 16, 2019 at 08:22
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A student was provided with 1.5g of XCO3. He reacted it with 50cm³ of 1M HCl which was excess. Determine the volume of CO2 produced...
(Solved)
A student was provided with 1.5g of XCO3. He reacted it with 50cm³ of 1M HCl which was excess. Determine the volume of CO2 produced at S.T.P.
(R.F.M of x CO3 = 100) molar gas volume at S.T.P = 22400cm³.
Date posted:
September 16, 2019
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Answers (1)
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Sulphur (IV) oxide and nitrogen (IV) oxide reacts as shown in the equation below.
(Solved)
Sulphur (IV) oxide and nitrogen (IV) oxide reacts as shown in the equation below.
SO2 + NO2----->SO3(g) + NO(g)
(a) Using oxidation numbers show that this is a redox reaction.
(b) Identify the reducing agent.
Date posted:
September 16, 2019
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Answers (1)
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15cm³ of a gaseous hydrocarbon reacted completely with 45cm³ of oxygen. 30cm³ of carbon (IV) oxide were formed.
Determine the formula of the hydrocarbon given that...
(Solved)
15cm³ of a gaseous hydrocarbon reacted completely with 45cm³ of oxygen. 30cm³ of carbon (IV) oxide were formed.
Determine the formula of the hydrocarbon given that all volumes of gases were measured under the same conditions of temperature and pressure.
Date posted:
September 16, 2019
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Answers (1)
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The results of an experiment to determine the solubility of potassium chlorate in water at 30°C were as follows.
Mass of dish = 15.86g.
Mass of dish...
(Solved)
The results of an experiment to determine the solubility of potassium chlorate in water at 30°C were as follows.
Mass of dish = 15.86g.
Mass of dish + saturated solution at 30°C = 26.8g.
Mass of dish + solid potassium chlorate after evaporation to dryness = 16.86g.
Calculate the mass of saturated solution containing 60g of water at 30°C.
Date posted:
September 13, 2019
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Answers (1)
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Excess iron was allowed to rust in 2dm³ of most air and the volume of air remaining was measured at 1 atmospheric pressure each day.
(Solved)
Excess iron was allowed to rust in 2dm³ of most air and the volume of air remaining was measured at 1 atmospheric pressure each day.The results were as follows.

(i) Write an equation for the formation of rust.
(ii) On which day was the reaction complete. Explain.
(iii) What is the percentage volume of oxygen in air. Show your working.
Date posted:
September 13, 2019
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Answers (1)
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A given sample of ink is a mixture of red dye, blue dye and orange dye. The blue dye is least absorbed than the rest...
(Solved)
A given sample of ink is a mixture of red dye, blue dye and orange dye. The blue dye is least absorbed than the rest and the red dye is most sticky.
(a) Complete the paper chromatogram below showing their separation.

(b) The above dyes are soluble in water. Describe how a pure sample of blue dye can be obtained.
(c) Name the solvent used in paper chromatography.
Date posted:
September 13, 2019
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Answers (1)
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The set up below was used to prepare a hydrocarbon.
(Solved)
The set up below was used to prepare a hydrocarbon.

(a) Name solid X
(b) Give a reason why sand is placed at the bottom of the flask.
(c) Write a balanced equation for the reaction taking place in the flask.
Date posted:
September 13, 2019
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Answers (1)
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The sketch of the graph below shows a reaction between magnesium ribbon and dilute hydrochloric acid.
(Solved)
The sketch of the graph below shows a reaction between magnesium ribbon and dilute hydrochloric acid.

(a) On the graph indicate the curve for 0.05M HCl
(b) Other than change in concentration, name two other factors that can affect the rate of reaction above.
Date posted:
September 13, 2019
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Answers (1)
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Study the flow chart below carefully.
(Solved)
Study the flow chart below carefully.

(a) Identify the cat-ion in the colourless solution N.
(b) Write ionic equations for the reactions in Step I.
Date posted:
September 13, 2019
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Answers (1)
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Study the energy level diagram below and use it to answer the questions that follow.
(Solved)
Study the energy level diagram below and use it to answer the questions that follow.

(a) Identify the heat change 
(b) Given that the heat change for 
Calculate the heat change for the reaction 
Date posted:
September 13, 2019
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Answers (1)
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The following diagram shows how chlorine gas can be prepared in the laboratory.
(Solved)
The following diagram shows how chlorine gas can be prepared in the laboratory.

Complete the diagram
Date posted:
September 13, 2019
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Answers (1)
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A compound of carbon hydrogen and oxygen contains 57.15% carbon, 4.76% hydrogen and rest oxygen. If its relative molecular mass is 126, find its molecular...
(Solved)
A compound of carbon hydrogen and oxygen contains 57.15% carbon, 4.76% hydrogen and rest oxygen. If its relative molecular mass is 126, find its molecular formula. (C = 12, H = 1, O = 16)
Date posted:
September 13, 2019
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Answers (1)
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A volume of 80cm3 of nitrogen gas diffused through an office in 40 seconds. How long will 170cm3 of carbon (IV) oxide take to diffuse...
(Solved)
A volume of 80cm3 of nitrogen gas diffused through an office in 40 seconds. How long will 170cm3 of carbon (IV) oxide take to diffuse through the same office? (N = 14, C = 12, O = 16)
Date posted:
September 13, 2019
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Answers (1)
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The figure below shows part of a Bunsen burner. Study it and answer the questions that follow.
(Solved)
The figure below shows part of a Bunsen burner. Study it and answer the questions that follow.

(a) Name labelled parts B and D.
(b) State the function of the part labelled B.
Date posted:
September 13, 2019
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Answers (1)
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The following results were obtained during an experiment to determine the solubility of potassium nitrate in water at 300C.
Mass of dish = 15.86g, mass of...
(Solved)
The following results were obtained during an experiment to determine the solubility of potassium nitrate in water at 300C.
Mass of dish = 15.86g, mass of dish + saturated solution at 300C= 26.86g, mass of dish + solid KNO3 after evaporation to dryness = 16.7g. Calculate the mass of saturated solution containing 60.0g of water at 300C.
Date posted:
September 12, 2019
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Answers (1)
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Explain why chlorine is a gas while iodine is a solid at room temperature.
(Solved)
Explain why chlorine is a gas while iodine is a solid at room temperature.
Date posted:
September 12, 2019
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Answers (1)
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Perspex is a synthetic polymer of formula
(Solved)
Perspex is a synthetic polymer of formula

(a) Write the structural formula of the monomer of Perspex.
(b) State the type of polymerization involved in the formation of perspex.
Date posted:
September 12, 2019
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Answers (1)
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When 8.8g of hydrocarbon Z was burnt in excess air, 14.4g of water and 11.95 dm3 of carbon (IV) oxide were obtained at s.t.p. Determine...
(Solved)
When 8.8g of hydrocarbon Z was burnt in excess air, 14.4g of water and 11.95 dm3 of carbon (IV) oxide were obtained at s.t.p. Determine the empirical formula of Z.
Date posted:
September 12, 2019
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Answers (1)
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State the conditions under which copper reacts with sulphuric acid and give an equation for the reaction.
(Solved)
State the conditions under which copper reacts with sulphuric acid and give an equation for the reaction.
Date posted:
September 12, 2019
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Answers (1)
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Use the thermo chemical equations below to answer the questions that follow.
(Solved)
Use the thermo chemical equations below to answer the questions that follow.

(i) Name two types of heat changes represent by 
(ii) Draw an energy level diagram for the reaction represented by equation 1.
(iii) Calculate the standard enthalpy of formation of ethane.
Date posted:
September 12, 2019
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Answers (1)