-
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)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
Element M reacts with water at room temperature to produce 0.2 dm3 of gas. Determine the mass of M which was...
(Solved)
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
.
Answers (1)
-
A solution was made by dissolving 8.2g of calcium nitrate to give 2 litres of solution. (Ca = 40.0; N = 14.0;...
(Solved)
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
.
Answers (1)
-
When 15cm3 of a gaseous hydrocarbon, P, was burnt in 100cm3 of oxygen, the resulting gaseous mixture occupied 70cm3 at room temperature and pressure....
(Solved)
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
.
Answers (1)
-
A certain mass of gas occupies 146 dm^3 at 291 K and 98.31 kPa. What will be...
(Solved)
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
.
Answers (1)