1. Chemical and Physical Change

2.  Learning objectives  Defines chemical change as the rearrangement of atoms  Lists examples of the signs of a chemical reaction

3.  A change where the atoms stay the same- dissolving, cutting, molding, mixtures, change of state

4.  involves a change in atoms and a change in energy  Describe the changes that you see and might measure in the picture

5.  Change in temperature  Change in smell or taste

6.  Gas formation (bubbles of O 2, CO 2 or H 2 )  Light

7.  Formation of solid (precipitate)  Change in colour

8.  Reactions can be written in words  Iron + nitric acid  iron nitrite and hydrogen Or symbols Fe + HNO 3 + H 2 * there is a need to memorize some of the common acids* sulphuric acid, carbonic acid, hydrochloric acid, nitric acid

9.  Complete p.20 in your workbook  “Chemical vs Physical Changes”  Try your luck at p. 23 and 24 for homework  Create a foldable shown below: behind the correct door, define and give four examples of chemical change and physical change