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- State two chemical tests for the presence of water(Solved)
State two chemical tests for the presence of water
Date posted: September 19, 2017. Answers (1)
- What is oxidation agent?(Solved)
What is oxidation agent?
Date posted: September 19, 2017. Answers (1)
- What is oxidation?(Solved)
What is oxidation?
Date posted: September 19, 2017. Answers (1)
- State two applications of radioactivity in medicine.(Solved)
State two applications of radioactivity in medicine.
Date posted: September 19, 2017. Answers (1)
- Explain why calcium Oxide is not used to dry hydrogen chloride gas.(Solved)
Explain why calcium Oxide is not used to dry hydrogen chloride gas.
Date posted: September 19, 2017. Answers (1)
- Sulphur is extracted from underground deposits by frasch process. State two physical properties of Sulphur that makes it possible to be extracted through this process.(Solved)
Sulphur is extracted from underground deposits by frasch process. State two physical properties of Sulphur that makes it possible to be extracted through this process.
Date posted: September 19, 2017. Answers (1)
- Name a suitable drying agent for hydrogen chloride gas(Solved)
Name a suitable drying agent for hydrogen chloride gas
Date posted: September 19, 2017. Answers (1)
- Explain why iodine is a bad conductor of heat and electricity(Solved)
Explain why iodine is a bad conductor of heat and electricity
Date posted: September 19, 2017. Answers (1)
- Define the term esterification(Solved)
Define the term esterification
Date posted: September 19, 2017. Answers (1)
- What is the meaning of half life of a substance?(Solved)
What is the meaning of half life of a substance?
Date posted: September 19, 2017. Answers (1)
- Explain how alkaline solution is useful on acidic soil(Solved)
Explain how alkaline solution is useful on acidic soil
Date posted: September 18, 2017. Answers (1)
- Iron is extracted from its ore by the blast furnace process
a) Name chief ore from which iron is extracted from.
b) An ore is suspected to...(Solved)
Iron is extracted from its ore by the blast furnace process
a) Name chief ore from which iron is extracted from.
b) An ore is suspected to contain mainly iron. Describe a method that can be used to confirm the presence of iron in the ore
Date posted: September 18, 2017. Answers (1)
- Explain why hard water flowing in lead pipes may be safer for drinking than soft water
flowing in the same pipes.(Solved)
Explain why hard water flowing in lead pipes may be safer for drinking than soft water
flowing in the same pipes.
Date posted: September 18, 2017. Answers (1)
- In terms of structure and bonding. Explain why water (H2O) is a liquid at room temperature while Hydrogen sulphide (H2S) is a gas.(Solved)
In terms of structure and bonding. Explain why water (H2O) is a liquid at room temperature while Hydrogen sulphide (H2S) is a gas.
Date posted: September 18, 2017. Answers (1)
- In an experiment to determine the solubility in water at 300c, the following results were obtained.
Mass of empty evaporating dish = 26.2g
Mass of evaporating dish...(Solved)
In an experiment to determine the solubility in water at 300c, the following results were obtained.
Mass of empty evaporating dish = 26.2g
Mass of evaporating dish + saturated solution = 42.4g.
Mass of evaporating dish + dry solid Y = 30.4g
Use this data to calculate the solubility of Y at 300C.
Date posted: September 18, 2017. Answers (1)
- Define solubility(Solved)
Define solubility
Date posted: September 18, 2017. Answers (1)
- a) State and explain the observations made when chlorine water is exposed to light after 24 hours. (b)State one use of chlorine gas(Solved)
a) State and explain the observations made when chlorine water is exposed to light after 24 hours.
b)State one use of chlorine gas
Date posted: September 18, 2017. Answers (1)
- Highlight the steps followed when lighting a Bunsen burner(Solved)
Highlight the steps followed when lighting a Bunsen burner
Date posted: September 18, 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.
(a) What is meant by...(Solved)
M grammes of a radioactive isotope decayed to 5 grammes in 100 days. The half life of the
isotope is 25 days.
What is meant by half life
Date posted: September 18, 2017. Answers (1)
- A student burnt magnesium ribbon in a gas jar full of sulphur (IV) oxide gas.
(i) State two observations made in the gas jar
(ii) Write an...(Solved)
A student burnt magnesium ribbon in a gas jar full of sulphur (IV) oxide gas.
(i) State two observations made in the gas jar
(ii) Write an equation for the reaction that took place
Date posted: September 18, 2017. Answers (1)