-
A mixture contains iron(III)chloride,zinc(II)oxide and potassium chloride. Describe how each of the substance can be obtained from the mixture.
Date posted:
April 23, 2018
-
A sample of calcium chloride is contaminated with anhydrous aluminum chloride. Explain how a sample of calcium chloride can be obtained from the mixture
Date posted:
April 23, 2018
-
Substance Q has a melting point of 15°C and boiling point of 70°c.
(a)On the same axis,draw the melting point and boiling point graph for Q and the room temperature.
(b)State the physical state of substance Q at room temperature.
Date posted:
April 22, 2018
-
Octane and ethanol are liquids at a room temperature. Ethanol is soluble in water while octane is insoluble. Explain how water can be used to separate the mixture of octane and ethanol.
Date posted:
April 22, 2018
-
Explain why ammonium trioxocarbonate (iv) leaves no residue when heated
Date posted:
April 22, 2018
-
Write chemical equation for reaction between dry hydrogen gas and heated lead (ii) oxide.
Date posted:
April 21, 2018
-
(i) What is rusting?
(ii) Give the chemical name of rust.
Date posted:
April 21, 2018
-
Explain the term fractional crystallization.
Date posted:
April 21, 2018
-
Describe the process of extraction of Aluminium by electrolysis.
Date posted:
April 20, 2018
-
State uses of radio isotopes in the following:
1. Medicine
2. Agriculture
3. Industries
Date posted:
April 19, 2018
-
Given the following reagents describe how to prepare lead (ii) sulphate: Solid potassium sulphate, solid lead (ii) carbonate, dilute nitric (iv) acid and distilled water.
Date posted:
April 19, 2018
-
What are the advantages of universal indicators over other acid-base indicators?
Date posted:
April 19, 2018
-
A crystal of copper (II) sulphate was placed in a beaker of water. The beaker was left standing for two days without shaking. State and explain the observations that were made.
Date posted:
April 17, 2018
-
Explain how the hotness of a bunsen burner flame can be increased.
Date posted:
April 17, 2018
-
Explain why it is not advisable to store a solution of cadmium nitrate in a container made of zinc.
Date posted:
April 17, 2018
-
Name two non-crystalline form of Sulphur.
Date posted:
April 17, 2018
-
Dry ammonia gas is passed over heated lead(II) oxide in a combustion tube.
a) What observation would be made in the combustion tube
b) Outline a chemical test you would use to identify the colourless liquid collected in the u-tube
c) Name the colourless liquid
d) Write an equation for the reaction between ammonia and lead(II)oxide
Date posted:
April 17, 2018
-
Name the method that can be used to obtain pure iron (III) chloride from a mixture of iron (III) chloride and sodium chloride.
Date posted:
April 14, 2018
-
What is a Neutrino?
Date posted:
April 14, 2018
-
State four applications of Nuclear Radiation.
Date posted:
April 14, 2018
-
State and explain the five main components of Nuclear Power Plants that enables them use heat from nuclear reactors to produce electrical energy.
Date posted:
April 14, 2018
-
Give a reason why electrons are removed from the 4s orbital first then the d orbital to form cations.
Date posted:
April 14, 2018
-
State the four quantum numbers.
Date posted:
April 14, 2018
-
State the Heisenberg Uncertainty Principle.
Date posted:
April 14, 2018
-
State the failures of Bohr Theory.
Date posted:
April 14, 2018
-
Assumptions of Bohr governing the behavior of electrons in an atom
Date posted:
April 14, 2018
-
State the assumptions made by Bohr governing the behavior of electrons in an atom.
Date posted:
April 14, 2018
-
State five series of hydrogen emissions.
Date posted:
April 14, 2018
-
What is deliquescence?
Date posted:
April 13, 2018
-
Calculate the number of moles of molecules in 7.30g of HCL
Date posted:
April 12, 2018