Coloured flowers are decolourized. v1 When mixed with coloured flowers the free oxygen combines the dye to form colourless matter
john3 answered the question on November 4, 2017 at 23:02
-
State and explain the observations made when concentrated nitric (V) acid is added to copper turnings
(Solved)
State and explain the observations made when concentrated nitric (V) acid is added to copper turnings
Date posted:
November 4, 2017
.
Answers (1)
-
A student was asked to determine the percentage of zinc metal in a mixture of zinc metal and zinc oxide. He reacted the mixture with...
(Solved)
A student was asked to determine the percentage of zinc metal in a mixture of zinc metal and zinc oxide. He reacted the mixture with excess hydrochloric acid and accurately collected the gas evolved, which was then used to calculate the amount of zinc in the mixture.
(a) Name the gas that was evolved
(b) Apart from the reaction liberating the gas write a balanced equation for the other reaction that took place.
(c) Why would dilute nitric acid not suitable for this reaction?
Date posted:
November 4, 2017
.
Answers (1)
-
Give the agencies of the cation and onion in each of the following compounds. (1)Zinc sulphate (2)Magnesium carbonate (3)Aluminium nitrate
(Solved)
Give the agencies of the cation and onion in each of the following compounds.
1)Zinc sulphate
2)magnesium carbonate
3)Aluminium nitrate
Date posted:
November 4, 2017
.
Answers (1)
-
Using acidified potassium dichromate (VI) solution, describe how you would differentiate between sulphur (IV) oxide and hydrogen sulphide
(Solved)
Using acidified potassium dichromate (VI) solution, describe how you would differentiate between sulphur (IV) oxide and hydrogen sulphide
Date posted:
November 3, 2017
.
Answers (1)
-
Describe how sodium sulphate crystals can be prepared starting with 50cm3
of 2M sodium hydroxide and 1M sulphuric
(VI) acid
(Solved)
Describe how sodium sulphate crystals can be prepared starting with 50cm3
of 2M sodium hydroxide and 1M sulphuric
(VI) acid
Date posted:
November 3, 2017
.
Answers (1)
-
Explain why Aluminium is better conductor of electricity than magnesium
(Solved)
Explain why Aluminium is better conductor of electricity than magnesium
Date posted:
November 3, 2017
.
Answers (1)
-
Name one piece apparatus used to measure volume of gases
(Solved)
Name one piece apparatus used to measure volume of gases
Date posted:
November 3, 2017
.
Answers (1)
-
Explain why solid Carbon (IV) oxide is preferred over ordinary ice for use by ice cream vendors
(Solved)
Explain why solid Carbon (IV) oxide is preferred over ordinary ice for use by ice cream vendors
Date posted:
November 3, 2017
.
Answers (1)
-
A piece of burning magnesium was lowered into a gas jar containing nitrogen oxide. State and explain the observations made
-Write an equation for the reaction...
(Solved)
A piece of burning magnesium was lowered into a gas jar containing nitrogen oxide. State and explain the observations made
-Write an equation for the reaction above.
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)
-
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)
-
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)
-
Differentiate between Oxidation number and valency
(Solved)
A form two topical question (Atoms,Chemical reactions and formula)
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)
-
Define allotropy.
(Solved)
Define allotropy.
Date posted:
October 19, 2017
.
Answers (1)