-
State and explain the observations that would be made if a sample of sulphur is heated with concentrated nitric (V) acid.
Date posted:
February 3, 2017
-
Ethane gas was reacted with 1 mole of bromine gas. State one observation made during this reaction.
Date posted:
February 3, 2017
-
What condition could cause a poisonous gas to be formed when kerosene is burnt? Explain
Date posted:
February 3, 2017
-
Describe how solid sample of potassium sulphate can be prepared starting with 200 cm3 of 2M potassium hydroxide.
Date posted:
February 3, 2017
-
Start the Gay Lussac’s Law.
Date posted:
February 3, 2017
-
Starting with 50 cm 3 of 2.8 M sodium hydroxide, describe how a sample of pure sodium sulphate crystals can be prepared.
Date posted:
February 3, 2017
-
State why it is not advisable to wash vehicles using sea water.
Date posted:
February 3, 2017
-
State the Graham’s law of diffusion.
Date posted:
February 3, 2017
-
A small crystal of potassium manganate (VII) was placed in a beaker containing water. The beaker was left standing for two days without shaking. State and explain the observation that were made
Date posted:
February 3, 2017
-
In an experiment, ammonium chloride was heated in a test-tube. A moist red litmus paper placed at the mouth of the test tube first changed blue then red. Explain these observations
Date posted:
February 3, 2017
-
Charcoal is a fuel that is commonly used for cooking. When it burns it forms two oxides
a) Name the two oxides
b) State one use of the two oxide
Date posted:
February 3, 2017
-
What is the role of carbon (IV) oxide in fire extinguishing?
Date posted:
February 3, 2017
-
Describe how carbon (IV) oxide can be distinguished from carbon (II) oxide using calcium hydroxide solution
Date posted:
February 3, 2017
-
a) Diamond and graphite are allotropes of carbon. What is meant by an allotrope
b) Explain why graphite can be used as a lubricant while diamond cannot
Date posted:
February 3, 2017
-
State and explain one chemical property that makes carbon (II) oxide poisonous to human beings.
Date posted:
February 3, 2017
-
Carbon (II) oxide is describe as “a silent killer”.
(a) State one physical property of carbon (II) oxide that makes it “a silent killer”.
(b) Write the formula of the oxide of carbon which is "silent killer".
Date posted:
February 3, 2017
-
Explain why burning magnesium continues to burn in a gas jar containing sulphur (IV) oxide while a burning splint is extinguished.
Date posted:
February 3, 2017
-
State and explain the function of tartaric acid in baking powder.
Date posted:
February 3, 2017
-
Explain why it is not advisable to leave a Jiko with burning charcoal in closed room where one is sleeping.
Date posted:
February 3, 2017
-
When extinguishing a fire caused by burning kerosene, carbon (IV) oxide is used in preference to water. Explain
Date posted:
February 3, 2017
-
Give reason why calcium hydroxide solution is used to detect the presence of carbon (IV) oxide gas while sodium hydroxide is NOT.
Date posted:
February 3, 2017
-
Explain how conduction of electricity takes place in the following:
a) Iron metal
b) Molten lead (II) iodide
Date posted:
February 3, 2017
-
Charcoal is a fuel that is commonly used in cooking. When it burns it forms two oxides
a) Name the two oxides
b) State one use of the two oxides
Date posted:
February 3, 2017
-
Starting with barium nitrate solution, describe how a pure sample of barium carbonate can be prepared in the laboratory.
Date posted:
February 3, 2017
-
Describe how a pure sample of lead (II) sulphate can be prepared in the laboratory starting with lead metal
Date posted:
February 3, 2017
-
Describe one method that can be used to distinguish between sodium sulphate and sodium hydrogen sulphate.
Date posted:
February 3, 2017
-
Explain five ways the commonwealth members countries have benefited from the organisation.
Date posted:
February 2, 2017
-
Distinguish between the terms deliquescent and efflorescent as used in chemistry.
Date posted:
February 2, 2017
-
Describe how a solid sample of the double salt, ammonium iron (II) sulphate, can be prepared using the following reagents: Aqueous ammonia, sulphuric (VI) acid and iron metal
Date posted:
February 2, 2017
-
Starting with sodium metal, describe how a sample of crystals of sodium hydrogen carbonate may be prepared.
Date posted:
February 2, 2017