3.1.4 Energetics, A Level Chemistry, AQA Study online

3.1.4 Energetics, A Level Chemistry, AQA
Study online at https://quizlet.com/_4vqo4e

1. What is enthalpy change? Heat energy transferred in a reaction at constant pressure

2. What are standard condi- 100kPa and stated temperature (normally 25 degrees celcius)
tions for enthalpy change?

3. What values of deltaH do Negative (less than 0)
exothermic reactions have?

4. What values of deltaH Positive (more than 0)
do endothermic reactions
have?

5. What do exothermic reac- Give out energy
tions do with energy?

6. What do endothermic reac- Absorb energy
tions do with energy?

7. Are oxidation reactions Exothermic
endo or exothermic?

8. Is combustion endo or Exothermic
exothermic?

9. Are thermal decomposition Endothermic
reactions endo or exother-
mic?

10. Is photosynthesis endo or Endothermic
exothermic?

11. What happens to reactant They are broken
bonds?


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, 3.1.4 Energetics, A Level Chemistry, AQA
Study online at https://quizlet.com/_4vqo4e

12. What happens to product They are formed
bonds?

13. Which bonds are broken: re- Reactant
actant or product bonds?

14. Which bonds are formed: Product
reactant or product bonds?

15. Is energy taken in or re- Taken in
leased when you break
bonds?

16. Is bond breaking endo or Endothermic
exothermic?

17. What values of deltaH does Positive (more than 0)
bond breaking have?

18. How does bond breaking It takes more energy to break
energy change as the bond
strength increases?

19. Is energy taken in or re- Released
leased when you make
bonds?

20. Is bond making endo or Exothermic
exothermic?

21. What values of deltaH does Negative (less than 0)
bond making have?

22. They release more energy when formed

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