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i) Frequency of incident light ? 1 mk
ii)Work function of the surface
john3 answered the question on November 12, 2017 at 13:19
- State the main reason for electroplating metallic items.(Solved)
State the main reason for electroplating metallic items.
Date posted: November 12, 2017. Answers (1)
- Crude oil is a source of many compounds that contain carbon and hydrogen only. (i) Name the process used to separate the components of crude...(Solved)
Crude oil is a source of many compounds that contain carbon and hydrogen only.
i) Name the process used to separate the components of crude oil.
ii) On what two physical properties of the above components does the separation depend?
Date posted: November 12, 2017. Answers (1)
- During extraction of iron in the blast furnace, state the uses of the following in the furnace. (a) Molten slag (b) Waste gases leaving the...(Solved)
During extraction of iron in the blast furnace, state the uses of the following in the furnace.
a) Molten slag
b) Waste gases leaving the furnace
c) Limestone
Date posted: November 12, 2017. Answers (1)
- What observation would be made if chlorine gas is bubbled through aqueous potassium iodide? Explain(Solved)
What observation would be made if chlorine gas is bubbled through aqueous potassium iodide?
Explain
Date posted: November 12, 2017. Answers (1)
- An element in period 4 of the periodic table forms a basic oxide of formula P2O. (a) What is the valency of P ?(Solved)
An element in period 4 of the periodic table forms a basic oxide of formula P2O.
a) What is the valency of P?
b) What name is given to the group of elements in which element P belongs
Date posted: November 12, 2017. Answers (1)
- An aqueous solution of hydrogen chloride gas reacts with manganese (IV) oxide to form chlorine gas while a solution of hydrogen chloride in methylbenzene does...(Solved)
An aqueous solution of hydrogen chloride gas reacts with manganese (IV) oxide to form chlorine gas while a solution of hydrogen chloride in methylbenzene does not react with manganese (IV) oxide. Explain
Date posted: November 12, 2017. Answers (1)
- (a)Name the type of polymerization involved in forming Dacron (b)Give one advantage of synthetic fibres over natural fibres(Solved)
a) Name the type of polymerization involved in forming Dacron
b) Give one advantage of synthetic fibres over natural fibres
Date posted: November 12, 2017. Answers (1)
- List two properties of (1)a good precipitating reagent (2)a good precipitate.(Solved)
List two properties of (1)a good precipitating reagent (2)a good precipitate.
Date posted: November 10, 2017. Answers (1)
- Outline the steps of carrying out a Q-test.(Solved)
Outline the steps of carrying out a Q-test.
Date posted: November 10, 2017. Answers (1)
- Give two examples of each of the following. (a)Biological Samples (b)Agricultural samples.(Solved)
Give two examples of each of the following (a)Biological Samples.(b)Agricultural samples.
Date posted: November 10, 2017. Answers (1)
- Name the intermolecular forces of attraction in water.(Solved)
Name the intermolecular forces of attraction in water.
Date posted: November 9, 2017. Answers (1)
- Carbon (II) oxide, methane and hydrogen are major sources of energy. (i) State and explain three reasons why hydrogen is a very attractive fuel(Solved)
Carbon (II) oxide, methane and hydrogen are major sources of energy.
i) State and explain three reasons why hydrogen is a very attractive fuel.
ii) State one disadvantage of using hydrogen fuel instead of methane.
Date posted: November 9, 2017. Answers (1)
- Give one harmful effect of radioisotopes(Solved)
Give one harmful effect of radioisotopes
Date posted: November 9, 2017. Answers (1)
- Give two uses of hydrogen chloride(Solved)
Give two uses of hydrogen chloride
Date posted: November 9, 2017. Answers (1)
- (a) What is air pollution ? (b) State four gaseous substances present in unpolluted air(Solved)
(a) What is air pollution?
(b) State four gaseous substances present in unpolluted air
Date posted: November 9, 2017. Answers (1)
- a) Why is air considered as a mixture rather than a compound ? (b) State one similarity between rusting and combustion of iron.(Solved)
(a) Why is air considered as a mixture rather than a compound ?
(b) State one similarity between rusting and combustion of iron.
(c) Explain why iron nails rust faster in sodium chloride solution than in tap water.
Date posted: November 9, 2017. Answers (1)
- Magnesium sulphate may be used as a laxative. What does this term laxative mean(Solved)
Magnesium sulphate may be used as a laxative. What does this term laxative mean
Date posted: November 9, 2017. Answers (1)
- Describe how you can differentiate between Lead (II) ions and Calcium ions using Sodium chloride(Solved)
Describe how you can differentiate between Lead (II) ions and Calcium ions using Sodium chloride
Date posted: November 9, 2017. Answers (1)
- Copper (II) Sulphate crystals were placed in a beaker containing water. State and explain the observations made after two days(Solved)
Copper (II) Sulphate crystals were placed in a beaker containing water. State and explain the observations made after two days.
Date posted: November 9, 2017. Answers (1)
- Explain why water fetched in rocky areas tend to boil at higher temperature than distilled water(Solved)
Explain why water fetched in rocky areas tend to boil at higher temperature than distilled water
Date posted: November 9, 2017. Answers (1)