Please select a subject first
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Name an animal in which individuals can change sex. What does this indicate?
Concept: undefined >> undefined
On what basis is a chemical equation balanced?
Concept: undefined >> undefined
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State whether the following statement is true or false:
A chemical equation can be balanced easily by altering the formula of a reactant or product.
Concept: undefined >> undefined
What is wrong with the following chemical equation?
\[\ce{Mg + O -> MgO}\]
Correct and balance it.
Concept: undefined >> undefined
What does the symbol (aq) represent in a chemical equation?
Concept: undefined >> undefined
How will you indicate the following effect in a chemical equation?
A solution made in water.
Concept: undefined >> undefined
How will you indicate the following effect in a chemical equation?
Exothermic reaction
Concept: undefined >> undefined
How will you indicate the following effect in a chemical equation?
Endothermic reaction
Concept: undefined >> undefined
Translate the following statement into a chemical equation and then balance the equation:
Phosphorus burns in oxygen to give phosphorus pentoxide.
Concept: undefined >> undefined
Translate the following statement into a chemical equation and then balance the equation:
Carbon disulphide burns in air to give carbon dioxide and sulphur dioxide.
Concept: undefined >> undefined
Translate the following statement into a chemical equation and then balance the equation:
Aluminium metal replaces iron from ferric oxide, Fe2O3, giving aluminium oxide and iron.
Concept: undefined >> undefined
Translate the following statement into a chemical equation and then balance the equation:
Barium chloride reacts with zinc sulphate to give zinc chloride and barium sulphate.
Concept: undefined >> undefined
Give one example of a chemical reaction.
Concept: undefined >> undefined
Complete and balance the following equation:
\[\ce{NaOH + {..........} -> Na2SO4 + H2O}\]
Concept: undefined >> undefined
Complete and balance the following equation:
\[\ce{Ca(OH)2 + {..........} -> CaCO3 + H2O}\]
Concept: undefined >> undefined
Correct and balance the following equation:
\[\ce{Ca + H2O -> CaOH + H}\]
Concept: undefined >> undefined
Correct and balance the following equation:
\[\ce{N + H -> NH3}\]
Concept: undefined >> undefined
Write a complete balanced equation for the following reaction:
\[\ce{Calcium (solid) + Water (liquid) -> Calcium hydroxide (solution) + Hydrogen (gas)}\]
Concept: undefined >> undefined
Write a complete balanced equation for the following reaction:
\[\ce{Sulphur dioxide (gas) + Oxygen (gas) -> Sulphur trioxide (gas)}\]
Concept: undefined >> undefined
Balance the following equation:
\[\ce{Na + O2 -> Na2O}\]
Concept: undefined >> undefined
