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Aluminium is protected from rust by a layer of oxidised Al2O3. Can you write a balanced equation for the formation of this layer?

To form Al2O3 you need both Al and O2 (oxygen gas is a dimer): Al + O2 -> Al2O3 But this equation is not balanced. To balance it, first equate the number of oxygen atoms: Al + 3O2 -> 2Al2O3 Now you hav...
JB
Answered by Jessica B. • Chemistry tutor
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Can an ionic substance conduct electricity?

For an ionic substance to conduct electricity, its ions must be free to move. As such, it must be in a molten state or in solution. Solid ionic substances will not be able to conduct electricity.
GL
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What effect will increased temperature have on an equilibrium with a forward reaction which is exothermic?

Increased temperature will favour the backward (endothermic reaction.) Any change imposed on the system will be counteracted by a response which reverses the change, i.e. shift the equilibrium in the directi...
GI
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How does one test for halide ions?

Add to the unknown solution dilute nitric acid, then add silver nitrate solution. If Chloride, bromide or iodide ions are present then a white, cream and yellow precipitate will form respectively of silver h...
GI
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Describe one method of producing oxygen gas.

Decomposition of Hydorgen peroxide solution, H 2 O 2 , using Manganese (IV) oxide as a catalyst. Effervescence is observed as the oxygen gas is evolved and the gas can be collected by displacement of water i...
GI
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