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simulatneous equations are solved by eliminating one of the unknowns such as x or y. there are a number of ways to do this such as substitution or subtraction/addition. For this example we will use subtra...

(i) In general, when a molecule absorbs a UV-visible photon, an electron is promoted from one of the occupied molecular orbitals to an unoccupied molecular orbital at higher energy.

(ii) ...

Command word: Explain

This means that in order to score the 5-6 marks range, a detailed response with reasons for how something will benefit for improve a particular phenomenon is necessa...

Once a person has eaten a meal, their digestive system will break the nutrients down into smaller components that can travel in the blood to any parts of the body that need them. Any carbohydrates in t...

This question is a 10 marker and comes at the end of the 25 mark section on Plate Tectonics. 

When answering a Discuss question it is important to remeber that it is in essence a mini ess...