Please select a subject first
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Decomposition reactions can occur by electricity
Give balanced reactions.
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Decomposition reactions can occur by sunlight.
Give two balanced reactions.
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'Water is the universal solvent'. Comment.
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What are the observations and conclusions when tap water is boiled and evaporated in watch glass?
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What is the importance of dissolved salts in water?
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How is air dissolved in water different from ordinary air?
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Explain why boiled or distilled water tastes flat.
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Explain why:
Ice at zero degrees centigrade has greater cooling effect than water at 0oC.
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State the term: (Do not give examples)
A solution where solvent is a liquid other than water.
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Explain why:
Lakes and rivers do not suddenly freeze in the winters.
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Explain why:
The solute cannot be separated from a solution by filtration.
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In which of the following substances will there be
Increase in mass
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In which of the following substances will there be
Decrease in mass
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In which of the following substances will there be
No change in mass when they are exposed to air?
Sodium chloride
Iron
Conc. sulphuric acid
Table salt
Sodium carbonate crystals
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What is the advantage of a detergent over soap?
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Why does the hardness of water render it unfit for use in a boiler.
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Why does the hardness of water render it unfit for use in a washing purposes.
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