1. Endothermic & Exothermic Chemical Reactions and Their Thermal Properties

3. Absorbs E from the surroundings.

4. Requires an input of energy in order to happen (react).ENERGY SURROUNDINGS

7. energy drawn into the system is taken from its surroundings.

9. Monitor △T (change in temp.)

10. Endothermic reactions will ALWAYS drop in temperature.(even if only a little)

11. Ways to Identify A Reaction

12. Examples Melting Ice: this is why it feels cold against your skin You’RE PART OF THE REACTION!

14. Loses E to the surroundings.

15. Energy of the surroundings will increase.ENERGY FROM SUN SURROUNDINGS

19. Monitor △T (change in temp.)

20. System and its surroundings

21. Endothermic reactions will ALWAYS drop in temperature.(even if only a little)

22. Ways to Identify A Reaction

23. Other Examples H2O(liquid)H2O(vapor) ∆H=32KJ A positive H-value indicates the system gained energy during the reaction.

24. Other Examples H2O(liquid)H2O(solid) ∆H=-46KJ A negativeH-value indicates the system lost energy during the reaction.