CHEMISTRY The study of matter, its properties, and its changes Matter – anything that has mass and takes up space

Physical Properties characteristic of a substance colour odour lustre texture ductility malleability melting point boiling point state of matter at room temperature (solid, liquid, or gas).

Chemical Properties the way a substance changes to create something new Common Chemical Properties: ability to burn – flame, heat flash point – lowest temp. a flammable liquid will ignite behaviour in air – react or tarnish reaction with water – corrode or dissolve reaction to heating – melt or decompose

Physical Change nothing new is created ex a change in the state of matter dissolving or melting doesn’t change the chemical properties

Chemical Change when a substance changes to create something new there are 5 signs of a chemical change: 1. colour changes 2. heat or light produced or absorbed 3. bubbles of gas are formed 4. solid material forms (precipitate) 5. change is difficult to reverse

5.1 Visible ChangeExample A new colour appearsuniversal indicator turning purple in a base Heat or light is produced or absorbed. firefly lighting up Bubbles of gas are formed. fizzing tablet in water A solid material (a precipitate) forms in liquid. Lead (II) Iodide forms when Lead ((II) Nitrate and Sodium Iodide are mixed The change is (generally) difficult to reverse. a candle burning