109459
Description
Flashcards by Shell Wood, updated more than 1 year ago
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Created by Shell Wood
over 11 years ago
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| Question | Answer |
| Define Standard enthalpy change of formation | The enthalpy change when one mole of a pure substance is formed from its elements in their normal physical states under RTP. (298K and 101.325 kPa) |
| Define Standard enthalpy change of combustion | The enthalpy change when one mole of a pure substance is completely burnt in sufficient oxygen under rtp. (298K and 101.325 kPa) |
| ΔH means | Total change in enthalpy |
| Define : Thermodynamics | The science of energy conversion involving heat and other forms of energy especially work. |
| What is the 1st law of thermodynamics? | Energy cannot be created nor destroyed |
| Standard enthalpy of formation. ΔH2 has to be reversed as does the value associated with this arrow. | |
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Image:
combust.gif (image/gif)
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Enthalpy of combustion ΔH [products] arrow has to be reverse as does the val |
| What are the conditions of RTP? | 298 Kelvin 101.325 kPa |
| Define activation energy | The minimum energy required to initiate a reaction. |
| How can the activation energy be reduced? How? | Use a catalyst Lowers the Ea of a reaction by utilising different reaction pathways |
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