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- State two uses of sodium carbonate(Solved)
State two uses of sodium carbonate
Date posted: November 3, 2017. Answers (1)
- A mixture of kerosene and water was shaken and left to stand, ammonia gas was then bubbled into the mixture followed by a few drops...(Solved)
A mixture of kerosene and water was shaken and left to stand, ammonia gas was then bubbled into the mixture followed by a few drops of phenolphthalein indicator. State and explain the observations made
Date posted: November 3, 2017. Answers (1)
- If chlorine gas is passed over heated iron fillings and the product dissolved in water, a yellow solution is formed.(i) Identify the yellow solution(Solved)
If chlorine gas is passed over heated iron fillings and the product dissolved in water, a yellow solution is formed.
(i) Identify the yellow solution.
(ii) What would be observed if aqueous sodium hydroxide solution was added to the yellow solution?
Date posted: November 3, 2017. Answers (1)
- Name the most suitable method you can use to separate;(a) Xanthophyll and chlorophyll in green leaves. (b) Oil from simsim seeds.(Solved)
Name the most suitable method you can use to separate;
(a) Xanthophyll and chlorophyll in green leaves.
(b) Oil from simsim seeds.
Date posted: November 3, 2017. Answers (1)
- Explain why the order of reactivity increases down group I elements but decreases down group (VII) elements(Solved)
Explain why the order of reactivity increases down group I elements but decreases down group (VII) elements.
Date posted: November 3, 2017. Answers (1)
- Name the ore from which copper is commonly extracted(Solved)
Name the ore from which copper is commonly extracted
Date posted: November 3, 2017. Answers (1)
- Briefly explain the following observations.
(i) Alkaline earth metals are generally less reactive than the alkali metals(Solved)
Briefly explain the following observations.
(i) Alkaline earth metals are generally less reactive than the alkali metals
Date posted: November 3, 2017. Answers (1)
- How does the use of manganese (IV) oxide in the laboratory preparation of chlorine gas differ from its use on the laboratory preparation of oxygen...(Solved)
How does the use of manganese (IV) oxide in the laboratory preparation of chlorine gas differ from its use on the laboratory preparation of oxygen gas?
Date posted: November 3, 2017. Answers (1)
- What is meant by molar heat of formation?(Solved)
What is meant by molar heat of formation?
Date posted: November 3, 2017. Answers (1)
- Describe how a pure sample of copper turnings can be obtained from mixture of copper turnings and zinc carbonate(Solved)
Describe how a pure sample of copper turnings can be obtained from mixture of copper turnings and zinc carbonate
Date posted: November 3, 2017. Answers (1)
- Name the process that takes place when:(i) Fats or oils are hydrolyzed using an alkali. (ii) Sulphur is added to rubber in the manufacture of...(Solved)
Name the process that takes place when:
(i) Fats or oils are hydrolyzed using an alkali
(ii) Sulphur is added to rubber in the manufacture of rubber tyres
Date posted: November 3, 2017. Answers (1)
- Give one physical test for water(Solved)
Give one physical test for water
Date posted: October 30, 2017. Answers (1)
- Differentiate between Oxidation number and valency(Solved)
A form two topical question (Atoms,Chemical reactions and formula)
Date posted: October 26, 2017. Answers (1)
- Differentiate between electron affinity and ionization energy(Solved)
Differentiate between electron affinity and ionization energy
Date posted: October 26, 2017. Answers (1)
- What are the processes involved in cooling of a substance from gaseous state to solid state?(Solved)
What are the processes involved in cooling of a substance from gaseous state to solid state?
Date posted: October 26, 2017. Answers (1)
- Highlight the main components of the following ions; (a)Ammonium ion (b)Hydronium ion.(Solved)
Highlight the main components of the following ions; (a)Ammonium ion (b)Hydronium ion.
Date posted: October 26, 2017. Answers (1)
- Why is it always advisable to scoop chemicals substance using a clean spatula?(Solved)
Why is it always advisable to scoop chemicals substance using a clean spatula?
Date posted: October 25, 2017. Answers (1)
- Explain why molten calcium chloride and magnesium chloride conduct electricity while carbon tetrachloride and silicon tetrachloride do not(Solved)
Explain why molten calcium chloride and magnesium chloride conduct electricity while carbon tetrachloride and silicon tetrachloride do not
Date posted: October 25, 2017. Answers (1)
- What is organic chemistry?(Solved)
What is organic chemistry?
Date posted: October 24, 2017. Answers (1)
- What is a chemical formula?(Solved)
What is a chemical formula?
Date posted: October 21, 2017. Answers (2)