1. Y9 Chemistry Unit Lesson 7
Physical and chemical change
Conservation of matter

2. parts of a reaction Learning Objectives
List the parts of a chemical reaction
Understand what the arrow means
Identify and count the number of atoms in a given chemical formula

3. Definitions Reactants: substance(s) at the beginning
Products: new substance(s) at the end
Yields: the yield arrow indicates the direction of the reaction
A chemical reaction can sometimes go back and forth
CaCO3  CaO + C02

4. Chemical Reactions
Reactants yield arrow Product

5. Magnesium Oxide formation

6. Conservation of Matter
Matter can neither be created or destroyed
What’s on one side has to be found on the other

7. Naming and counting atoms
Periodic Table
Learn the first 20 elements and common metals

8. Naming and counting

9. Counting Atoms: example

10. Practice

11. Task In your Chemistry Booklet complete page 19 and 21
“counting atoms-chemical reactions”
W.S.51 Chemical Reactions
In your textbook read p.98-9 and answer questions 1-7 in your notebook