(a) B – Cotton
D – Rubber tube/gas inlet
(b) Used to regulate the amount of air entering the chimney.
maurice.mutuku answered the question on September 13, 2019 at 05:17
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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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Give the name of the following organic compounds.
(Solved)
Give the name of the following organic compounds.
Date posted:
September 12, 2019
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Answers (1)
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Below is a scheme of some reactions starting with but-z-yne. Study it and answer the questions that follow.
(Solved)
Below is a scheme of some reactions starting with but-z-yne.
Study it and answer the questions that follow.
(a) Name Y, X and T
Date posted:
September 12, 2019
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Answers (1)
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What is an amphoteric oxide?
(Solved)
What is an amphoteric oxide?
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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Give equations to show the reactions that take place when;
(a) iron reacts with steam.
(b) Give one industrial use of the gas produced in the...
(Solved)
Give equations to show the reactions that take place when;
(a) iron reacts with steam.
(b) Give one industrial use of the gas produced in the reactions in (a) above.
Date posted:
September 12, 2019
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Answers (1)
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Calculate the volume of nitrogen (I) oxide produced when 38.2g of ammonium nitrate is completely decomposed by heating
(at s.t.p). (N = 14, H = 1,...
(Solved)
Calculate the volume of nitrogen (I) oxide produced when 38.2g of ammonium nitrate is completely decomposed by heating
(at s.t.p). (N = 14, H = 1, O = 16)
Date posted:
September 12, 2019
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Answers (1)
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Complete the table below.
(Solved)
Complete the table below.
Date posted:
September 12, 2019
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Answers (1)
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Use the information in the table below to answer the questions that follow.
(Solved)
Use the information in the table below to answer the questions that follow.
(a) Write the electron arrangement of:
(i) ion of S
(ii) atom of T
(b) Explain why the melting point of T is higher than that of U.
Date posted:
September 12, 2019
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Answers (1)
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You are given the following half equations:
(Solved)
You are given the following half equations:
(i) Obtain an equation of the cell reaction.
(ii) Calculate the 
value for the cell.
(iii) Give the oxidizing species.
Date posted:
September 12, 2019
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Answers (1)
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The structures below represent two cleaning agents M and P.
(Solved)
The structures below represent two cleaning agents M and P.
Which cleaning agent would be most suitable for use with water containing calcium sulphate. Give a reason.
Date posted:
September 12, 2019
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Answers (1)
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Use the nuclear equations below to answer the questions that follow.
(Solved)
Use the nuclear equations below to answer the questions that follow.
(a) Give the actual names of particles X and Y.
(b) Give the name of a radiation whose emission does not change the mass number or the atomic number of a radioisotope.
Date posted:
September 12, 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.
(a) Identity solid X.
(b) Write an ionic equation for the reaction between P and copper (II) sulphide solution.
(c) State the observation made when gas P is bubbled through iron (III) chloride solution.
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 thermochemical equations below to calculate the enthalpy of formation of ethane.
(Solved)
Use the thermochemical equations below to calculate the enthalpy of formation of ethane.
Date posted:
September 12, 2019
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Answers (1)
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Manganese sulphide reacts with acids according to the following equation.
(Solved)
Manganese sulphide reacts with acids according to the following equation.
State, giving a reason what would happen to the equilibrium if;
(i) Water is added to the equilibrium mixture.
(ii) Hydrogen chloride is bubbled into the equilibrium mixture.
Date posted:
September 12, 2019
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Answers (1)
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Explain why flammable substances should always be kept away from flames in the laboratory.
(Solved)
Explain why flammable substances should always be kept away from flames in the laboratory.
Date posted:
September 12, 2019
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Answers (1)
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When a sample of ethane was burnt, the heat provided raised the temperature of 500cm3 of water by 21.5k
(specific heat capacity of water = 4.2kJ/kg/k...
(Solved)
When a sample of ethane was burnt, the heat provided raised the temperature of 500cm3 of water by 21.5k
(specific heat capacity of water = 4.2kJ/kg/k and density of water = 1g/cm3.
Calculate the:
(i) Heat change for the reaction.
(ii) Mass of ethane burnt (RFM of ethane = 30).
Date posted:
September 12, 2019
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Answers (1)