1. 2.4 Chemical Reactions BELL RINGER [3 Minutes] Mark K/S/H/D for new vocabulary sheet Write a sentence using one AWL word

2. 2.4 Chemical Reactions MYP Biology: Chemical Reactions

3. 2.4 Chemical Reactions Chemical Reactions are processes that transform matter by breaking and reforming bonds in molecules and compounds. –Reactants are the materials at the start of the reaction that are changed during a chemical reaction. –Products are the materials at the end of the reaction. Chemical Reactions Transform Matter

4. 2.4 Chemical Reactions REACTANTSPRODUCTS Chemical Reactions Transform Matter

5. 2.4 Chemical Reactions Chemical Reactions Transform Matter

6. 2.4 Chemical Reactions Chemical reactions continue until they reach EQUILIBRIUM, or a balanced state in which the concentrations of reactants and products no longer change. CO 2 + H 2 O H 2 CO 3 Chemical Reactions Transform Matter

7. 2.4 Chemical Reactions While matter is transformed in reactions, it is never created or destroyed. The products contain the same types and numbers of atoms as the reactants. Scientists say that matter is conserved in reactions. Chemical Reactions Transform Matter

8. 2.4 Chemical Reactions

9. Activation Energy is the amount of energy that needs to be absorbed to start a chemical reaction. Reactions Absorb & Release Energy

10. 2.4 Chemical Reactions An EXOTHERMIC reaction is when more heat is released from the reaction as a product. Heat energy goes exits the reaction. –Exo = Exit Reactions Absorb & Release Energy

11. 2.4 Chemical Reactions An ENDOTHERMIC reaction is when more heat is absorbed by the reaction as a reactant. Heat energy goes into the reaction. –Endo = Into Reactions Absorb & Release Energy

12. 2.4 Chemical Reactions REACTANTS PRODUCTS Activation Energy (Ea) EXOTHERMIC Reactions Absorb & Release Energy

13. 2.4 Chemical Reactions ENDOTHERMIC Reactions Absorb & Release Energy

14. 2.4 Chemical Reactions Reactants? Products? Endothermic or Exothermic? A + B  AB + Heat Check for Understanding…

15. 2.4 Chemical Reactions Heat + EF  F + E Reactants? Products? Endothermic or Exothermic? Check for Understanding…

16. 2.4 Chemical Reactions How much Activation Energy is needed? Check for Understanding…

17. 2.4 Chemical Reactions ENDOTHERMIC or EXOTHERMIC? Check for Understanding…

18. 2.4 Chemical Reactions ENDOTHERMIC or EXOTHERMIC? Check for Understanding…