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Distinguish between an acid and a base
Date posted:
October 11, 2017
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Give two application of bases in the society
Date posted:
October 11, 2017
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A solution of hydrogen chloride gas can conduct an electric current, while that hydrogen chloride in methylbenzene does not conduct. Explain
Date posted:
October 8, 2017
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Describe the non-luminous flame of Bunsen burner and give a reason why it is preferred when heating substances in laboratory
Date posted:
October 8, 2017
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Sodium is highly electropositive,hence it can only be isolated by electrolysis
(a)Name the major ore from which sodium is extracted
(b)why should ore be in molten form before electrolysis
(c)Give the detrimental effect on the enviroment that may result from the extraction of sodium
Date posted:
October 6, 2017
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Sodium is highly electropositive,hence it can only be isolated by electrolysis
(a)Name the major ore from which sodium is extracted
(b)why should ore be in molten form before electrolysis
(c)Give the detrimental effect on the environment that may result from the extraction of sodium
Date posted:
October 6, 2017
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(a)Patients with heart burn are advised to take milk of magnesia.Explain
(b)Write an ionic equation between (ii)hydroxide and dillute sulphuric (vi)acid
Date posted:
October 6, 2017
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Propanol and butanol are third and fourth members respectively of the same homologous series.State and explain how their boiling point compare
Date posted:
October 6, 2017
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You are provided with the following :copper turning,dilute sulphuric acid and a source of heat. Describe fully how you would prepare copper (ii) sulphate crystals
Date posted:
October 6, 2017
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When lead nitrate and sodium sulphate react, a white precipitate is formed. (i)Identify the white precipitate.(ii) Write an ionic equation of the reaction
Date posted:
October 5, 2017
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Starting with copper metal, describe how you can prepare solid copper (ii) carbonate
Date posted:
October 5, 2017
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What observation will be made when a few drops of concentrated sulphuric (VI) acid are added to crystals of sugar? Explain your answer
Date posted:
October 4, 2017
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Explain one way in which sulphur (IV) oxide is a pollutant
Date posted:
October 4, 2017
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The molar enthalpy of neutralisation between hydrochloric acid and ammonia solution was found to be -52.2 kj mol4, while that of hydrochloric acid and sodium hydroxide was 57.1 kJ mol-1. Explain the difference in these values.
Date posted:
October 4, 2017
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What is meant by the term 'Enthalpy of formation'?
Date posted:
October 4, 2017
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Element M reacts with water at room temperature to produce 0.2 dm3 of gas. Determine the mass of M which was reacted with water. (Molar gas volume at room temperature is 24 dm3, Relative atomic mass of M = 7).
Date posted:
October 4, 2017
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A solution was made by dissolving 8.2g of calcium nitrate to give 2 litres of solution. (Ca = 40.0; N = 14.0; O = 16.0).
Determine the concentration of nitrate ions in moles per litre
Date posted:
October 4, 2017
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When 15cm^3 of a gaseous hydrocarbon, P, was burnt in 100cm^3 of oxygen, the resulting gaseous mixture occupied 70cm^3 at room temperature and pressure. When the gaseous mixture was passed through potassium hydroxide solution, its volume decreased to 25cm^3.
(a) What volume of oxygen was used during the reaction?
Date posted:
October 4, 2017
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Name two ores from which copper is extracted
Date posted:
October 4, 2017
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A certain mass of gas occupies 146 dm^3 at 291 K and 98.31 kPa. What will be its temperature if its volume is reduced to 133 dm^3 at 101.325 kPa?
Date posted:
October 4, 2017
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A gas jar full gas V was opened in air. Explain the observation made by use of an equation.
Date posted:
October 3, 2017
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paper two.
Date posted:
October 2, 2017
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What is boiling?
Date posted:
October 2, 2017
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What is a saturated solution?
Date posted:
October 2, 2017
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Give a reason why nitric (V) acid is stored in dark brown bottles.
Date posted:
September 30, 2017
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State one use of sodium carbonate
Date posted:
September 30, 2017
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What is meant by the term dynamic equilibrium?
Date posted:
September 29, 2017
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a) Name the following processes:
i) When anhydrous calcium chloride was left in an open beaker
overnight a solution was formed.
ii) When sodium carbonate decahydrate crystals are left in an open beaker for some days it turned
into powder.
Date posted:
September 29, 2017
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Explain why the error in the Dalton's theory has not affected its validity?
Date posted:
September 29, 2017
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Explain why a substance conducts electric current when in molten state and not in solid state.
Date posted:
September 28, 2017