(a) what condition is necessary for an equilibrium to be established?
(b) When calcium carbonate is heated, the equilibrium shown below is established
CaCO3 (s) → CaO(s) + CO2(g)
How would the position of equilibrium be affected if a small amount of dilute potassium hydroxide is added to the equilibrium mixture? Explain
In terms of structure and bonding, explain why graphite is used as a lubricant.
100 g of a radioactive substance was reduced to 12.5 g in 15.6 years. Calculate the half – life of the substance
Methane reacts with oxygen according to the equation given below.
CH4 (g) + 2O2 (g) →CO2 (g) + 2H2O (l), ΔH = 890 KJ MOL-1
Calculate the volume of methane which would produce 111.25 kj when completely burnt.(Molar volume of a gas = 24 litres.)
In the industrial extraction of lead, the ore is first roasted in a furnace. The solid mixture obtained is then fed into another furnace together with coke, limestone and scarp iron. State the function of each of the following in this process:
(c) Scrap iron
The reaction between how concentrated sodium hydroxide and chlorine produces sodium chlorate (V), sodium chloride and water
(a) Write the equation for the reaction
(b) Give one use of sodium chlorate (V)
A certain carbonate, GCO3, reacts with dilute hydrochloric acid according to the equation given below:
GCO3(s) + 2HCL(aq)= GCl2 (aq) + (CO2(g) + H2O(l)
If 1 g of the carbonate reacts completely with 20 cm3 of 1 M hydrochloric acid ,calculate the relative atomic mass of G (C = 12.0 = 16.0)
Determine the oxidation state of sulphur in the following compounds:
Give the name and draw the structural formula of the compound formed when one mole of ethane reacts with one mole of chlorine gas.
Zinc oxide reacts with acids and alkalis
a) Write the equation for the reaction between zinc oxide and:
i) Dilute sulphuric acid
ii) Sodium hydroxide solution
b) What property of zinc oxide is shown by the reaction in (a) above?
Maurice Atika is a teacher and a netprenuer.