The melting point of an impure substance is lower than that of a pure substance and the latter is sharp while the former occur in a range.
Kavungya answered the question on March 25, 2019 at 09:01
- 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...(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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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)
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Using Kinetic theory of matter explain condensation process.
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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How do you identify pure substances in chemistry?
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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Distinguish between physical and chemical changes.
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)
- 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. Answers (1)
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Where in Kenya is Crystallization method used? State what happens briefly.
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)
- 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. Answers (1)