Physical and Chemical Changes Review from Sec 1: - 3 phases of matter - 6 changes in phase

Physical changes If we are able to reverse the change, then it is a physical change. For a physical change, no new substances are created

3 ways to recognize Physical changes Changing the phase of a substance

3 ways to recognize Physical changes Changing the phase of a substance Change the shape of an object

3 ways to recognize Physical changes Changing the phase of a substance Change the shape of an object Prepare or separation of a mixture

Chemical changes In a chemical change, the molecules are rearranged. A chemical change is not reversible. A chemical change creates a new substance.

5 ways to recognize a chemical change Change in temperature

5 ways to recognize a chemical change Change in temperature Release of light

5 ways to recognize a chemical change Change in temperature Release of light Residue forms

5 ways to recognize a chemical change Change in temperature Release of light Residue forms Colour change

5 ways to recognize a chemical change Change in temperature Release of light Residue forms Colour change Release of gas

Did you make or separate a mixture? Colour change Physical Change Chemical change (3 ways to recognize) (5 ways to recognize) Did the shape change? Did the phase change? Did you make or separate a mixture? Colour change Change in temperature Light released Gas released Residue formed

Demo 1: Lead nitrate and sodium iodide

Demo 2 Water and phenolphthalein

Demo 3 Calcium and water

Demo 4 Iodine and heat

Demo 5 Cellulose and energy

Demo 6 Cellulose and energy

The Law of Conservation of mass Mass can neither be created nor destroyed. It can only be transformed.