What is the heat content that is stored in a chemical system ?
Enthalpy
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What is the name of a reaction whereby the enthalpy of the products is smaller than the enthalpy of the reactants ? (this causes heat to be lost to its surroundings).
Exothermic
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What is the name of a reaction whereby the enthalpy of the products is larger than the enthalpy of the reactants ? (this causes heat to be taken in from its surroundings).
Endothermic
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An example of an exothermic reaction. (think of animals).
Respiration
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An example of an endothermic reaction. (think of plants).
Photosynthesis
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What is the enthalpy change that takes place when breaking by homolytic fission 1 mol of a given bond in the molecules of a gaseous species.
Bond enthalpy
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What is the energy required to raise the temperature of 1g of a substance by 1 degree celsius.
Specific heat capacity
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What is the minimum energy required to start a reaction by the breaking of bonds.
Activation energy
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What is the physical state of a substance under the standard conditions of 100 kPa (1 atmosphere) and 298 K (25 degrees celsius).
Standard state
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What is the enthalpy change that takes place when 1 mol of a substance react completely with oxygen under standard conditions, all reactants and products being in their standard states.
DeltaHC
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What is the enthalpy change that takes place when 1 mol of a compound is formed from its constituent elements in their standard states under standard conditions.
DeltaHF
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What is the enthalpy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions, all reactants and products being in their standard states.
DeltaHR
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What states that, if a reaction can take place by more than 1 route and the initial and final conditions are the same, the total enthalpy change is the same for each route.
Hess' law
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What is the enthalpy of formation of an element.
Zero
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What are: a pressure of 100 kPa, a stated temperature 298 K or (25 degrees celsius) and a concentration of 1.0 mol per dm cubed classed as ?
Standard conditions
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What is a diagram showing alternate routes between reactants and products which allows the indirect determintation of an enthalpy change from other known enthalpy changes using Hess' law.
Enthalpy cycle
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What is the average enthalpy change that takes place when breaking by homolytic fission 1 mol of a given bond in the molecule of a given species.
Average bond enthalpy
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Other cards in this set
Card 2
Front
What is the name of a reaction whereby the enthalpy of the products is smaller than the enthalpy of the reactants ? (this causes heat to be lost to its surroundings).
Back
Exothermic
Card 3
Front
What is the name of a reaction whereby the enthalpy of the products is larger than the enthalpy of the reactants ? (this causes heat to be taken in from its surroundings).
Back
Card 4
Front
An example of an exothermic reaction. (think of animals).
Back
Card 5
Front
An example of an endothermic reaction. (think of plants).
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