Its the time taken by radioactive substance to disintegrate to half the original mass
isaacmuthini answered the question on October 12, 2017 at 12:43
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State two observations made when sodium carbonate crystals are dropped into a beaker containing dilute hydrochloric acid.
(Solved)
State two observations made when sodium carbonate crystals are dropped into a beaker containing dilute hydrochloric acid.
Date posted:
October 11, 2017
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Answers (1)
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Give a reason why bakers must use baking powder when making cakes and doughnuts
(Solved)
Give a reason why bakers must use baking powder when making cakes and doughnuts
Date posted:
October 11, 2017
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Answers (1)
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State the products formed when a dillute acid reacts with a carbonate
(Solved)
State the products formed when a dillute acid reacts with a carbonate
Date posted:
October 11, 2017
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Answers (1)
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Write a well balanced chemical equation to show the reaction between Magnesium and dilute Sulphuric acid
(Solved)
Write a well balanced chemical equation to show the reaction between Magnesium and dilute Sulphuric acid
Date posted:
October 11, 2017
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Answers (1)
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Give two tests for acidic substances
(Solved)
Give two tests for acidic substances
Date posted:
October 11, 2017
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Answers (1)
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Give the colour observed when a litmus paper is dropped into the solutions of the following (i)Distilled water (ii)sour milk (iii)Lemon juice
(Solved)
Give the colour observed when a litmus paper is dropped into the solutions of the following
i)Distilled water
ii)sour milk
iii)Lemon juice
Date posted:
October 11, 2017
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Answers (1)
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Distinguish between an acid and a base
(Solved)
Distinguish between an acid and a base
Date posted:
October 11, 2017
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Answers (1)
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Give two application of bases in the society
(Solved)
Give two application of bases in the society
Date posted:
October 11, 2017
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Answers (1)
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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
(Solved)
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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Answers (1)
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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
(Solved)
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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Answers (1)
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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...
(Solved)
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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Answers (1)
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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...
(Solved)
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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Answers (1)
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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
(Solved)
(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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Answers (1)
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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
(Solved)
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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Answers (1)
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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
(Solved)
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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Answers (1)
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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
(Solved)
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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Answers (1)
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Starting with copper metal, describe how you can prepare solid copper (ii) carbonate
(Solved)
Starting with copper metal, describe how you can prepare solid copper (ii) carbonate
Date posted:
October 5, 2017
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Answers (1)
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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
(Solved)
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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Answers (1)
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Explain one way in which sulphur (IV) oxide is a pollutant
(Solved)
Explain one way in which sulphur (IV) oxide is a pollutant
Date posted:
October 4, 2017
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Answers (1)
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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...
(Solved)
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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Answers (1)