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

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

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

Chemical Reactions Reactants yield arrow Product

Magnesium Oxide formation

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

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

Naming and counting

Counting Atoms: example

Practice

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