Enthalpy change

Last updated: 04/02/2020
AQA A-Level Chemistry Energetics Enthalpy change
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  1. Current
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  3. Answered

  1. What is the definition of enthalpy change?

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  2. What symbol is used to signify enthalpy change?

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  3. What is the definition of enthalpy?

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  4. What is the definition of a chemical system?

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  5. What are the surroundings of a chemical reaction?

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  6. What is the definition of thermodynamics?

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  7. What is the conservation of energy law?

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  8. What happens between bonds when chemicals react?

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  9. How are thermal energy changes measured?

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  10. What is the definition of an exothermic reaction?

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  11. What is the definition of an endothermic reaction?

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  12. What happens to the surroundings when heat is lost from a chemical system?

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  13. What happens to the surroundings when heat is gained in a chemical system?

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  14. Describe the change in enthalpy within an exothermic reaction.

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  15. Describe the change in enthalpy within an endothermic reaction.

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  16. Describe the enthalpy change sign for an exothermic reaction.

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  17. Describe the enthalpy change sign for an endothermic reaction.

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  18. For a graph with the variables, enthalpy and the progress of a reaction, describe the position of both the products and reactants for an exothermic reaction.

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  19. For a graph with the variables, enthalpy and the progress of a reaction, describe the position of both the products and reactants for an endothermic reaction.

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  20. Which state are substances considered in their standard conditions?

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  21. What is the standard condition for pressure in kPa?

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  22. What is the standard condition for pressure in Pa?

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  23. What is the standard condition for temperature in K?

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  24. What is the standard condition for temperature in ℃?

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  25. What is the definition for the enthalpy change of a reaction?

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