Get premium membership and access questions with answers, video lessons as well as revision papers.
i) Neutron - proton ratio,
ii) The binding energy in the nucleus
johnmulu answered the question on February 22, 2017 at 05:49
- State two differences between chemical and nuclear reactions. (Solved)
State two differences between chemical and nuclear reactions.
Date posted: February 22, 2017. Answers (1)
- M grammes of a radioactive isotope decayed to 5 grammes in 100 days
The half-life of the isotope is 25 days(Solved)
M grammes of a radioactive isotope decayed to 5 grammes in 100 days
The half-life of the isotope is 25 days
a) What is meant by half-life?
b) Calculate the initial mass M of the radioactive isotope.
Date posted: February 22, 2017. Answers (1)
- An alkanol has the following composition by mass: Hydrogen 13.5%, oxygen 21.6% and carbon 64.9%
Determine the empirical formula of the alkanol (C = 12.0: H = 1.0; O = 16.0)(Solved)
An alkanol has the following composition by mass: Hydrogen 13.5%, oxygen 21.6% and carbon 64.9%
Determine the empirical formula of the alkanol (C = 12.0: H = 1.0; O = 16.0)
Date posted: February 22, 2017. Answers (1)
- Give the name of the first member of the alkene homologous series and Describe a chemical test that can be used to distinguish butanol from butanoic acid. (Solved)
a) Give the name of the first member of the alkene homologous series
b) Describe a chemical test that can be used to distinguish butanol from butanoic acid.
Date posted: February 22, 2017. Answers (1)
- State two uses of ethanol(Solved)
State two uses of ethanol other than as an alcoholic drink
Date posted: February 22, 2017. Answers (1)
- Cotton is natural polymer. State one advantage and one disadvantage of this polymer. (Solved)
Cotton is natural polymer. State one advantage and one disadvantage of this polymer.
Date posted: February 22, 2017. Answers (1)
- Describe two chemical tests that can be used to distinguish ethanol from ethanoic acid(Solved)
Describe two chemical tests that can be used to distinguish ethanol from ethanoic acid
Date posted: February 22, 2017. Answers (1)
- State two uses of the polymer polystyrene(Solved)
Give two uses of the polymer polystyrene
Date posted: February 22, 2017. Answers (1)
- Two organic compounds P and Q decolourise acidified potassium manganate (VII) solution, but only P reacts with sodium metal to give a colourless gas. (Solved)
Two organic compounds P and Q decolourise acidified potassium manganate (VII) solution, but only P reacts with sodium metal to give a colourless gas. Which homologous series does compound P belong? Give a reason.
Date posted: February 22, 2017. Answers (1)
- Explain why the solubility of ethane in water is lower than of ethanol (Solved)
Explain why the solubility of ethane in water is lower than of ethanol
Date posted: February 22, 2017. Answers (1)
- What name is given to the process by which alcohol is formed from a carbohydrate (Solved)
What name is given to the process by which alcohol is formed from a carbohydrate
Date posted: February 22, 2017. Answers (1)
- The use of CFCs has been linked to depletion of the ozone layer.(Solved)
The use of CFCs has been linked to depletion of the ozone layer.
a) What does CFC stand for?
b) Explain the problem associated with the depletion of the ozone layer
c) State another environmental problem caused by CFCs
Date posted: February 22, 2017. Answers (1)
- Some animal and vegetable oils are used to make margarine and soap. Give the reagent and conditions necessary for converting the oils into:
(Solved)
Some animal and vegetable oils are used to make margarine and soap. Give the reagent and conditions necessary for converting the oils into:
a) Margarine
b) Soap.
Date posted: February 22, 2017. Answers (1)
- Name the process that takes place when:....
(Solved)
Name the process that takes place when:
i) Crystals of zinc nitrate change into solution when exposed to air
ii) An alcohol reacts with an organic acid in the presence of a catalyst to form a sweet smelling compound.
Date posted: February 21, 2017. Answers (1)
- a) What is the name given to a compound that contains carbon and hydrogen only?
b) Hexane is a compound containing carbon and hydrogen. (Solved)
a) What is the name given to a compound that contains carbon and hydrogen only?
b) Hexane is a compound containing carbon and hydrogen.
i) What method is used to obtain hexane from crude oil
ii) State one use of hexane
Date posted: February 21, 2017. Answers (1)
- Explain why the boiling point of ethanol is higher than that of hexane(Solved)
Explain why the boiling point of ethanol is higher than that of hexane (Relative molecular mass of ethanol is 46 while that of hexane is 86)
Date posted: February 21, 2017. Answers (1)
- The boiling point of ethanol, propanol and butanol are 78oC, 97.2oC and 117o(Solved)
The boiling point of ethanol, propanol and butanol are 78oC, 97.2oC and 117oC. Explain this trend
Date posted: February 21, 2017. Answers (1)
- Define the term heat of vaporization
(Solved)
What is meant by heat of vaporization
Date posted: February 21, 2017. Answers (1)
- Pentane and ethanol are miscible. Describe how water could be used to separate a mixture of pentane and ethanol(Solved)
Pentane and ethanol are miscible. Describe how water could be used to separate a mixture of pentane and ethanol
Date posted: February 21, 2017. Answers (1)
- State the observation that would be made when a piece of sodium metal is placed in samples of:(Solved)
State the observation that would be made when a piece of sodium metal is placed in samples of:
i) Pentane
ii) Pentanol
Date posted: February 21, 2017. Answers (1)