-
Paper chromatography of a plant extract gave the following results.
Which Solvent is the most suitable for purifying the extract? Explain.
(Solved)
Paper chromatography of a plant extract gave the following results.
Which Solvent is the most suitable for purifying the extract? Explain.
Date posted:
March 25, 2019
.
Answers (1)
-
Carbon dioxide doesn’t support combustion, yet burning of magnesium ribbon introduced in jar of carbon dioxide continues to burn. Explain this.
(Solved)
Carbon dioxide doesn’t support combustion, yet burning of magnesium ribbon introduced in jar of carbon dioxide continues to burn. Explain this.
Date posted:
March 25, 2019
.
Answers (1)
-
Where is the competition for oxygen reaction applied industrially?
(Solved)
Where is the competition for oxygen reaction applied industrially?
Date posted:
March 25, 2019
.
Answers (1)
-
Pollution is a health hazard which is directly proportional to the level of industrialisation in developing countries. Give evidence to justify this proclamation.
(Solved)
Pollution is a health hazard which is directly proportional to the level of industrialisation in developing countries. Give evidence to justify this proclamation.
Date posted:
March 25, 2019
.
Answers (1)
-
An experiment on competition for oxygen was carried out and results were tabulated in the table below. Use information in the table to answer the...
(Solved)
An experiment on competition for oxygen was carried out and results were tabulated in the table below. Use information in the table to answer the questions that follow.
(i) What is the best conclusion that can be drawn on the basis of the above results?
(ii) What is the order of reactivity of elements in this experiment?
(iii) What are the products formed where a reaction occurred?
(iv) If you were given an oxide copper how would you obtain copper metal from it?
Date posted:
March 25, 2019
.
Answers (1)
-
Distinguish between acidic and basic oxides.
(Solved)
Distinguish between acidic and basic oxides.
Date posted:
March 25, 2019
.
Answers (1)
-
What appropriate measures are being taken to reduce atmospheric pollution?
(Solved)
What appropriate measures are being taken to reduce atmospheric pollution?
Date posted:
March 25, 2019
.
Answers (1)
-
What gases are a common pollutant in the atmosphere?
(Solved)
What gases are a common pollutant in the atmosphere?
Date posted:
March 25, 2019
.
Answers (1)
-
Describe an experiment to investigate the “active part of air”.
(Solved)
Describe an experiment to investigate the “active part of air”.
Date posted:
March 25, 2019
.
Answers (1)
-
1.(a) List some methods used to prevent rusting.
(b) Name one substance which speeds up the rusting process
(Solved)
1.(a) List some methods used to prevent rusting.
(b) Name one substance which speeds up the rusting process
Date posted:
March 25, 2019
.
Answers (1)
-
What are the conditions necessary for rusting?
(Solved)
What are the conditions necessary for rusting?
Date posted:
March 25, 2019
.
Answers (1)
-
Why is there any increase when a metal like magnesium is burned in air?
(Solved)
Why is there any increase when a metal like magnesium is burned in air?
Date posted:
March 25, 2019
.
Answers (1)
-
Describe an experiment to show that Carbon dioxide is available in the atmosphere.
(Solved)
Describe an experiment to show that Carbon dioxide is available in the atmosphere.
Date posted:
March 25, 2019
.
Answers (1)
-
What evidence is there to show that there is water vapour in the air?
(Solved)
What evidence is there to show that there is water vapour in the air?
Date posted:
March 25, 2019
.
Answers (1)
-
What is air?
(Solved)
What is air?
Date posted:
March 25, 2019
.
Answers (1)
-
What is the difference between the melting point of a pure substance and that of an impure substance?
(Solved)
What is the difference between the melting point of a pure substance and that of an impure substance?
Date posted:
March 25, 2019
.
Answers (1)
-
What principle do refrigerators work on?
(Solved)
What principle do refrigerators work on?
Date posted:
March 25, 2019
.
Answers (1)
-
Briefly explain how ice-cream vendors use solid carbon dioxide (dry ice) to keep the ice-cream frozen.
(Solved)
Briefly explain how ice-cream vendors use solid carbon dioxide (dry ice) to keep the ice-cream frozen.
Date posted:
March 25, 2019
.
Answers (1)
-
Using Kinetic theory of matter explain condensation process.
(Solved)
Using Kinetic theory of matter explain condensation process.
Date posted:
March 25, 2019
.
Answers (1)
-
Why is that gases don’t have definite shape?
(Solved)
Why is that gases don’t have definite shape?
Date posted:
March 25, 2019
.
Answers (1)