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Air is a mixture of many gases such as N2 – 78%, O2 – 21%, 0.03%, and Noble gases 1%.
Water vapour, polluting gases and dust and smoke.
Kavungya answered the question on March 25, 2019 at 09:07
- 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)
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(i) Which one property of gas X can you tell from the method of preparation?
(ii) Identify...(Solved)
Below is an arrangement which was used to prepare gas.
(i) Which one property of gas X can you tell from the method of preparation?
(ii) Identify gas X
(iii) Why is Lead (II) nitrate more suitable than other nitrates for the preparation of gas X?
Date posted: March 25, 2019. Answers (1)
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What principle do refrigerators work on?
Date posted: March 25, 2019. Answers (1)
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Date posted: March 25, 2019. Answers (1)
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Date posted: March 25, 2019. Answers (1)
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Why is that gases don’t have definite shape?
Date posted: March 25, 2019. Answers (1)
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Date posted: March 25, 2019. Answers (1)
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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. Answers (1)
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Explain sublimation using Kinetic theory of matter.
Date posted: March 25, 2019. Answers (1)
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What does Kinetic theory of matter state?
Date posted: March 25, 2019. Answers (1)
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What is the difference between a compound and a mixture?
Date posted: March 25, 2019. Answers (1)
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Date posted: March 25, 2019. Answers (1)
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Describe briefly how filtration is applied industrially.
Date posted: March 25, 2019. Answers (1)
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(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. Answers (1)
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Date posted: March 25, 2019. Answers (1)
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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 a result of?
Date posted: March 25, 2019. Answers (1)
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State how chromatography is applied in real life situation.
Date posted: March 25, 2019. Answers (1)
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What do you understand by solvent extraction in separation of mixtures?
Date posted: March 25, 2019. Answers (1)
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What do impurities do to both Boiling points and melting points of substances?
Date posted: March 25, 2019. Answers (1)
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What method can be used to obtain pure crystals from a soluble solid with impurities?
Date posted: March 25, 2019. Answers (1)