Energy changes

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Making sense of energy changes helps chemists ot answer two very important questions: 'How fast?' and 'How far?'.
 
The definitions of energy quantities are very precise and so the study of this area of chemistry calls for close attention to detail.

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Tutorials

• Sorted FAQs on Energy Changes
• Some exam "Dos and Don'ts": Energy changes

Recently Asked Questions

• I tried to plan and design an experiment to find the molar enthalpy change for the reaction between magnesium powder and aqueous copper(II) sulphate. I decided to measure the sulphate into a polystyrene cup and add an excess of magnesium powder, then record the temperature. What should I do next?
• How do you find the heat change (in kJ) for the following reaction: 2HCl(g) + PbO₂(s)---->PbCl₂(s) + H₂O₂(l)
• How would I plan to measure the concentration of sodium hydroxide if I didn't know it using calorimetry (thermochemistry)? Even if I did the experiment and found the enthalpy change of neutralisation when 2 mol dm^-3 NaOH is mixed against HCl, how can I calculate and prove the concentration of NaOH? What are the calculations and equations I need to to this? 140408

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Tests

• Enthalpy changes (AS)

updated: 09 July 2003