Please select a subject first
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Write the effects of chemical reactions.
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What are the chemical reactions that occur in everyday life?
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About 78% of the volume of air is ______.
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The first scientific theory about atoms was given by J J. Thomson.
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In which one of the following state's water is present on Earth?
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Citric acid is present in ______.
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Acids are ______ in taste.
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Acids have a sour taste and they are soapy to touch.
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Write the important uses of hydrochloric acid and sulphuric acids.
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Dead and decaying plants and animals release ______ gas.
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______ is an odourless and highly inflammable gas.
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Which gas is used as fuels and solvents in the laboratory?
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Hydrocarbons are less dense than ______.
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Sewage sludge can also be decomposed by microorganisms to produce methane gas along with impurities like carbon dioxide and ______.
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______ can also be used as a refrigerant.
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______ is used as fuel gas and propellant in aerosol sprays such as deodorants.
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Match the following:
| 1. | Hydrocarbons | a. | Marsh gas |
| 2. | Methane | b. | Cleanest fuel |
| 3. | Butane | c. | Catenation |
| 4. | CNG | d. | Polystyrene |
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Write any 2 properties of hydrocarbons.
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The ribosome is an organelle seen in prokaryotes and eukaryotes.
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