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
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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
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Answers (1)
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What principle do refrigerators work on?
(Solved)
What principle do refrigerators work on?
Date posted:
March 25, 2019
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Answers (1)
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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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Answers (1)
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Using Kinetic theory of matter explain condensation process.
(Solved)
Using Kinetic theory of matter explain condensation process.
Date posted:
March 25, 2019
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Why is that gases don’t have definite shape?
(Solved)
Why is that gases don’t have definite shape?
Date posted:
March 25, 2019
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Answers (1)
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How do you identify pure substances in chemistry?
(Solved)
How do you identify pure substances in chemistry?
Date posted:
March 25, 2019
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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,...
(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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Answers (1)
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Explain sublimation using Kinetic theory of matter.
(Solved)
Explain sublimation using Kinetic theory of matter.
Date posted:
March 25, 2019
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What does Kinetic theory of matter state?
(Solved)
What does Kinetic theory of matter state?
Date posted:
March 25, 2019
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What is the difference between a compound and a mixture?
(Solved)
What is the difference between a compound and a mixture?
Date posted:
March 25, 2019
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Answers (1)
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Distinguish between physical and chemical changes.
(Solved)
Distinguish between physical and chemical changes.
Date posted:
March 25, 2019
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Answers (1)
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Describe briefly how filtration is applied industrially.
(Solved)
Describe briefly how filtration is applied industrially.
Date posted:
March 25, 2019
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Answers (1)
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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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Answers (1)
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Where in Kenya is Crystallization method used? State what happens briefly.
(Solved)
Where in Kenya is Crystallization method used? State what happens briefly.
Date posted:
March 25, 2019
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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...
(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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Answers (1)
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State how chromatography is applied in real life situation.
(Solved)
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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What do impurities do to both Boiling points and melting points of substances?
(Solved)
What do impurities do to both Boiling points and melting points of substances?
Date posted:
March 25, 2019
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Answers (1)
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What method can be used to obtain pure crystals from a soluble solid with impurities?
(Solved)
What method can be used to obtain pure crystals from a soluble solid with impurities?
Date posted:
March 25, 2019
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Answers (1)
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Name
(a) Cleansing agents for removing these stains from your school dress:
(i) Oily and greasy –
(ii) Blood stains –...
(Solved)
Name
(a) Cleansing agents for removing these stains from your school dress:
(i) Oily and greasy –
(ii) Blood stains –
(iii) Perspiration stains –
(b) A drying agent for ammonia gas –
(c) A solvent for paint –
(d) A gas which cannot be collected over water –
(e) A solid that sublimes –
Date posted:
March 25, 2019
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Answers (1)