a) It is the contamination of air with additional material in solid or gaseous form causing injury or harm to human
health or property.
b) Oxygen, nitrogen, carbon (IV) oxide inert gases
john3 answered the question on November 9, 2017 at 11:42
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a) Why is air considered as a mixture rather than a compound ? (b) State one similarity between rusting and combustion of iron.
(Solved)
(a) Why is air considered as a mixture rather than a compound ?
(b) State one similarity between rusting and combustion of iron.
(c) Explain why iron nails rust faster in sodium chloride solution than in tap water.
Date posted:
November 9, 2017
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Answers (1)
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Magnesium sulphate may be used as a laxative. What does this term laxative mean
(Solved)
Magnesium sulphate may be used as a laxative. What does this term laxative mean
Date posted:
November 9, 2017
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Answers (1)
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Describe how you can differentiate between Lead (II) ions and Calcium ions using Sodium chloride
(Solved)
Describe how you can differentiate between Lead (II) ions and Calcium ions using Sodium chloride
Date posted:
November 9, 2017
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Answers (1)
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Copper (II) Sulphate crystals were placed in a beaker containing water. State and explain the observations made after two days
(Solved)
Copper (II) Sulphate crystals were placed in a beaker containing water. State and explain the observations made after two days.
Date posted:
November 9, 2017
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Answers (1)
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Explain why water fetched in rocky areas tend to boil at higher temperature than distilled water
(Solved)
Explain why water fetched in rocky areas tend to boil at higher temperature than distilled water
Date posted:
November 9, 2017
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Answers (1)
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What type of bond is formed when Beryllium and oxygen react
(Solved)
What type of bond is formed when Beryllium and oxygen react
Date posted:
November 9, 2017
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Answers (1)
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What are the optimum conditions of conversion of SO2 to SO3
(Solved)
What are the optimum conditions of conversion of SO2 to SO3
Date posted:
November 9, 2017
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Answers (1)
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(a) Noble gas are usually unreactive. Explain this phenomena. (b) Explain the meaning of the term ductility a property found in metals
(Solved)
(a) Noble gas are usually unreactive. Explain this phenomena.
(b) Explain the meaning of the term ductility a property found in metals
Date posted:
November 9, 2017
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Answers (1)
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What is a standard solution?
(Solved)
What is a standard solution?
Date posted:
November 9, 2017
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Answers (1)
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Compare the reactivity of chlorine and bromine
(Solved)
Compare the reactivity of chlorine and bromine
Date posted:
November 9, 2017
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Answers (1)
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Explain the following observation made by a form three student.(a) Dilute hydrochloric acid does not react with copper metal, but dilute nitric acid does
(Solved)
Explain the following observation made by a form three student.
a) Dilute hydrochloric acid does not react with copper metal, but dilute nitric acid does.
b) Describe briefly how one can distinguish Nitrogen (I) oxide from Nitrogen (II) oxide.
Date posted:
November 9, 2017
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Answers (1)
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When Iron is added to blue Copper (II) Sulphate, the solutions turns light green and a brown solid is precipitated.
(Solved)
When Iron is added to blue Copper (II) sulphate solution, the solution turns light green and a brown solid is precipitated.
a) Identify the type of reaction described above.
b)Explain the observations made
Date posted:
November 8, 2017
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Answers (1)
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State one factor that can determine stability of an atom.
(Solved)
State one factor that can determine stability of an atom.
Date posted:
November 8, 2017
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Answers (1)
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Name the products of electrolysis of fused copper (II) chloride using carbon electrodes. (i) Anode (ii) Cathode. Explain
(Solved)
Name the products of electrolysis of fused copper (II) chloride using carbon electrodes.
(i) Anode
(ii) Cathode
Explain
Date posted:
November 8, 2017
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Answers (1)
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Explain the following observations. (a)Aluminium is used in the manufacture of pans and sufurias. (b)Magnesium Oxide has a higher melting point than sodium oxide
(Solved)
Explain the following observations.
a)Aluminium is used in the manufacture of pans and sufurias.
b)Magnesium Oxide has a higher melting point than sodium oxide
c)Solid sodium chloride does not conduct electricity whereas molten sodium chloride does
Date posted:
November 8, 2017
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Answers (1)
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Explain why aqueous sodium chloride is not suitable as an electrolyte for the manufacture of sodium in the Downs process
(Solved)
Explain why aqueous sodium chloride is not suitable as an electrolyte for the manufacture of sodium in the Downs process
Date posted:
November 8, 2017
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Answers (1)
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In the Downs process calcium chloride salt is added to sodium Chloride. Explain why?
(Solved)
In the Downs process calcium chloride salt is added to sodium Chloride. Explain why?
Date posted:
November 8, 2017
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Answers (1)
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State the law of combining volumes of gases
(Solved)
State the law of combining volumes of gases
Date posted:
November 8, 2017
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Answers (1)
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When sulphur is heated in a boiling tube in the absence of air, the yellow crystals melt into a golden yellow mobile liquid at 113^oC
(Solved)
When sulphur is heated in a boiling tube in the absence of air, the yellow crystals melt into a golden yellow mobile liquid at 113oC. The liquid turns into a dark brown viscous mass at 180oC. At 400oC the brown liquid becomes less viscous and flows easily. Explain these observations
Date posted:
November 8, 2017
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Answers (1)
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Chlorine gas was bubbled through water and the solution exposed to sunlight for a few hours.
(Solved)
Chlorine gas was bubbled through water and the solution exposed to sunlight for a few hours.State and explain the observations made.
Date posted:
November 8, 2017
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Answers (1)