How can I apply the knowledge I learn in lessons to tougher exam style questions ?
The million dollar question when it comes to chemistry and is often the difference between a good grade and a great grade. The basis of this is to consolidate your basic concepts, make sure those are instilled within your chemistry thinking.(Flash cards are a great way to go about this) Then practice, practice, practice but when doing questions, at least at the start have your notes open so you can get a feel of how the basic concepts tie in. Whilst studying mark schemes to see exactly what the examiner's want. If you follow this and build up your confidence then those tough application questions will no longer bother you.
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I don't understand how the first two quantum numbers fit into describing atoms.
At 25 °C, the initial rate of reaction is 3.1 × 10−3 mol dm−3 s−1 when the initial concentration of C is 0.48 mol dm−3 and the initial concentration of D is 0.23 mol dm−3 . Calculate a value for the rate constant at this T when rate = k [C][D].
Potassium Chlorate(VII) decomposes to produce Potassium Chloride and Oxygen. Using the following data calculate the enthalpy change of this decomposition: Enthalpy of formation(KClO4) = -430 kJ mol-1, Enthalpy of formation(KCl) = -440 kJ mol-1