Please select a subject first
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List two main components of ecosystem?
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We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly. Why is it so ? Explain.
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Explain why carbon forms compounds mainly by covalent bond.
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List two important roles play in the environment by decomposers.
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Elements forming ionic compounds attain noble gas configuration by either gaining or losing electrons from their outermost shells. Give reason to explain why carbon cannot attain noble gas configuration in this manner to form its compounds.
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Name the type of bonds formed in ionic compounds and in the compounds formed by carbon.
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Give reason why carbon compounds are generally poor conductors of electricity.
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"Our food grains such as wheat and rice, the vegetables and fruits and even meat are found to contain varying amounts of pesticide residues." State the reason to explain how and why it happens?
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State the reason why carbon can neither form C4+ cations nor C4− anions but forms covalent compound.
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State the reason to explain why covalent compounds "are bad conductors of electricity".
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State the reason to explain why covalent compounds "have low melting and boiling points."
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Why should a magnesium ribbon be cleaned before it is burnt in air?
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What is a balanced chemical equation? Why should a chemical equation be balanced?
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Balance the chemical equation.
\[\ce{HNO3 +Ca(OH)2 -> Ca(NO3)2 + H2O}\]
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Balance the following chemical equation.
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
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Balance the following chemical equation.
\[\ce{NaCl + AgNO3 -> AgCl + NaNO3}\]
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Balance the following chemical equation.
\[\ce{BaCl2 + H2SO4 -> BaSO4 + HCl}\]
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Translate the following statement into chemical equation and then balance it.
Hydrogen gas combines with nitrogen to form ammonia
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Translate the following statement into chemical equation and then balance it.
Hydrogen sulphide gas burns in the air to give water and sulphur dioxide.
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Translate the following statement into chemical equation and then balance it.
Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
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