When magnesium is burned in air, it chemically combines with oxygen gas to form a compound called magnesium oxide which is heavier than the metal i.e. the white ash is heavier than the original piece of magnesium.
Thus when an element is heated or burnt in air, it combines with oxygen from air and gains in weight.
Kavungya answered the question on March 25, 2019 at 09:23
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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
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What evidence is there to show that there is water vapour in the air?
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What evidence is there to show that there is water vapour in the air?
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March 25, 2019
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What is air?
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March 25, 2019
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What is the difference between the melting point of a pure substance and that of an impure substance?
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March 25, 2019
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What principle do refrigerators work on?
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March 25, 2019
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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
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Using Kinetic theory of matter explain condensation process.
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Using Kinetic theory of matter explain condensation process.
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March 25, 2019
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Why is that gases don’t have definite shape?
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Why is that gases don’t have definite shape?
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March 25, 2019
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How do you identify pure substances in chemistry?
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March 25, 2019
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(Solved)
The following are some of the methods used to collect gases. With reasons state which method is suitable for each of the following gases, Ammonia, carbon dioxide, oxygen.
Date posted:
March 25, 2019
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Explain sublimation using Kinetic theory of matter.
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Explain sublimation using Kinetic theory of matter.
Date posted:
March 25, 2019
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(Solved)
What does Kinetic theory of matter state?
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March 25, 2019
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What is the difference between a compound and a mixture?
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March 25, 2019
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Distinguish between physical and chemical changes.
Date posted:
March 25, 2019
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Describe briefly how filtration is applied industrially.
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Describe briefly how filtration is applied industrially.
Date posted:
March 25, 2019
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The time – temperature graph obtained when ice was heated to its boiling point is given below.
(i) Describe the changes along regions A, B, C...
(Solved)
The time – temperature graph obtained when ice was heated to its boiling point is given below.
(i) Describe the changes along regions A, B, C and D.
(ii) Explain why both B and D levelled off?
Date posted:
March 25, 2019
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Where in Kenya is Crystallization method used? State what happens briefly.
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Where in Kenya is Crystallization method used? State what happens briefly.
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March 25, 2019
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When fine chalk is suspended in water and viewed through a microscope the chalk particles appear to move in a random fashion. This motion is...
(Solved)
When fine chalk is suspended in water and viewed through a microscope the chalk particles appear to move in a random fashion. This motion is a result of?
Date posted:
March 25, 2019
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State how chromatography is applied in real life situation.
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State how chromatography is applied in real life situation.
Date posted:
March 25, 2019
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What do you understand by solvent extraction in separation of mixtures?
(Solved)
What do you understand by solvent extraction in separation of mixtures?
Date posted:
March 25, 2019
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