(a) Solid dissolves
(b) addition of hydrochloric acid favour backward reaction
Describe how a solid sample of Zin (II) carbonate can be prepared starting with zinc oxide
The structures below represents a portion of a polymer
(a) Give the name of the polymer
(b) Give one industrial use of the polymer
With reference to iodine, distinguish between covalent bonds and Van Der Waals forces
When carbon dioxide gas was passed through aqueous calcium hydroxide a white suspension was formed
(a) Write an equation for the reaction that took place
(b) State and explain the changes that would occur when carbon dioxide gas is bubbled through the white suspension
Iron is extracted from its ore by the blast furnace process
(a) Name one ore from which iron is extracted
(b) One of the impurities in iron is removed in the form of calcium silicate. Write an equation for the reaction in which calcium silicate is produced
Concentrated nitric (V) acid was added to iron (II) sulphate acidified with sulphuric acid and the mixture heated. The solution turned from pale green to yellow with evolution of brown gas. Explain these observations.
In an experiment, sulphur dioxide gas was bubbled into water followed by chlorine gas. The resulting clear solution gave a white precipitate when mixed with a acidified barium chloride solution. Explain these observations
The graph below represents a radioactive decay series for isotope H. Study it and answer the questions that follow
(a) Name the type of radiation emitted when isotope H changes to isotope J.
(b) Write an equation for the nuclear reaction that occur when isotope J changes to isotope K
(c) Identify a pair of isotope of an element in the decay series
Use the reactions given below to answer the questions that follow. The letters do not represent the actual symbols of the elements
(a) What name is given to the type of reaction given above?
(b) Arrange the elements D, E, F and G in the order of their reactivity starting with the most reactive
(c) Complete the equation below
State and explain how the rate of reaction between zinc granules and steam can be increased
When potassium nitrate is heated, it produces potassium nitrate and gas C
(a) Identify gas C
(b) Name the type of reaction undergone by the potassium nitrate
(a) Write the electronic configuration of calcium ( atomic number 20 ) and beryllium (atomic number 4)
(b) Why is calcium more reactive than beryllium
Maurice Atika is a teacher and a netprenuer.