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10 Cards in this Set
- Front
- Back
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What is enthalpy a measure of? |
The heat energy in a chemical system. |
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What are standard conditions? |
100kPa 298K 1moldm-³ Denoted by a superscript London underground symbol. |
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What is standard enthalpy change of reaction? |
ΔrH is the enthalpy change accompanied by a reaction with the molar quantities shown in an equation under standard conditions. |
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What is standard enthalpy change of neutralisation? |
ΔneutH the enthalpy change when an acid reacts with a base to form 1 mole of water under standard conditions. |
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What is standard enthalpy change of combustion? |
The enthalpy change when 1 mole of a compound reacts completely with oxygen under standard conditions. |
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What is standard enthalpy change of formation? |
ΔfH is the enthalpy change when one mole of substance is produced from its elements under standard conditions. |
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How do you calculate energy change from experimental data? |
Q=mcΔT Q is energy /J M is mass/g ΔT is temperature change/T or K |
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What does Hess's law state? |
If a reaction can take place by two routes the total enthalpy change will be the same for both routes. |
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What is average bond enthalpy? |
The energy required to break one mole of a specified type of bond in a gaseous molecule. |
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What do Hess's law cycles look like? |
Change direction of arrows depending on the enthalpy change used. |
