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10 Cards in this Set
- Front
- Back
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What is the volume of one mole of any gaseous substance at standard temperature and pressure.
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24dm3
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Define standard enthalpy change of combustion.
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The amount of energy released when one mole of fuel is completely combusted.
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What is an exothermic reaction?
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A reaction that GIVES OUT energy to the environment. Enthalpy change of an exothermic is always negative.
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What is an endothermic reaction?
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A reaction that TAKES IN energy from the surroundings. Enthalpy change of an endothermic reaction is always positive.
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Define standard enthalpy change of formation.
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The enthalpy change when one mole of a substance is formed from its constituent elements in their standard state. This can be positive or negative.
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What is entropy.
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Entropy is the number of ways in which particles can be arranged.
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What causes an increase in entropy.
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Change in state from
solid-->lquid-->gas. Mixtures and solutions have greater entropy than unmixed constituents. An increase in the number of particles. |
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What is Hess's law?
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This states that as long as the strating and finishing points of a reaction are the same, the enthalpy change will be always be the same regardless of how you get from start to finish.
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What are enthalpy cycles?
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Enthalpy cycles use Hess's law and often the enthalpy change of formation to determine the enthalpy change of a reaction.
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What is bond enthalpy?
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The average energy required to break the bonds in one mole of gaseous compounds.
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