1. Chapter 3: Reactions Grade 11 University Chemistry Mr. Song
Feb

2. Question to Start off Reactions
What do you think Chemists do?
Question to Start off Reactions

3. Answers

4. Exmaple: Photochromic Lenses
Glasses that turn dark when they see sunlight
Embedded with microcrystal silver (I) chlorides: ____________
Lenses darkening is due to _________.
Lenses will begin to clear as soon as they are away from the UV light.
Exmaple: Photochromic Lenses

5. In order for Scientists to do this, we need to know the basic building blocks.
Different types of reactions.
Photochromic Lenses

6. Chemical reactions are grouped based on different reactions that occur.
By classifying reactions, we are able to predict the final outcome of the reaction.
5 Main types of Chemical reaction!
Chemical reactions are grouped based on different reactions that occur.
By classifying reactions, we are able to predict the final outcome of the reaction.
5 Main types of Chemical reaction!
Types of Reactions

7. Homework Concept map of how everything ties in together
Remember your grade 10 knowledge
Homework

8. Is Mass Gained or Lost During a Chemical Reaction?
YouTube Video:
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What happened to the mass? Was it conserved through out the experiment?
Is mass conserved in other chemical reactions as well?
What goes in, must come back out one way or the other.
Is Mass Gained or Lost During a Chemical Reaction?

9. Camp Fire?
Water? (gas, solid, liquid)
Examples?

10. Antoine Lavoisier Father of modern Chemistry
Named oxygen and hydrogen back in late 1700
Helped construct the Metric system
Trapped all the reactants and products. Including Gas. Law of conservation of Mass.
Antoine Lavoisier

11. Law of Conservation of Mass?
In any given chemical reaction, the total mass of the _________ equal the total mass of the _________.
States that mass is neither created nor destroyed in any chemical reaction.
2KNO3 (aq) + PbI2 (s)
Pb(NO3)2(aq)
2KI(aq)
158.2 g
158.2 g
Law of Conservation of Mass?

12. Balancing Equations ___Mg + ___ O2  ___MgO
___ Al + ____O2  ___ Al2O3
Balancing Equations

13. Class Work: Balancing Equations
Blackline Master 6.5c
Class Work: Balancing Equations

14. Synthesis General definition of Synthesis:
Two or more simple reactants combine to make ONE larger or more complex product.
A + B  AB
8 Fe + S8 ---> 8 FeS
Synthesis

15. Decomposition General definition of Decomposition:
One large compound is broken into TWO or more compounds or elements
AB  A + B
2 H2O ---> 2 H2 + O2
Decomposition

16. Combustion General definition of Combustion
Involves burning of a hydrocarbon in the presence of Oxygen
2 types of combustion
Complete
Incomplete
C10H8 + 12 O2 ---> 10 CO2 + 4 H2O
Combustion

17. Complete vs Incomplete
CxHy (s)/(l)/(g) + O2(g)  CO2(g) + H2O(l)/(g) + Energy CxHy(s)/(l)/(g) + O2(g)  CO2(g) + H2O(l)/(g) + CO(g) + C(s) +
Complete vs Incomplete

18. Homework Concept map of how everything ties in together
Remember your grade 10 knowledge
Homework