Physical & Chemical Change. Physical Change: a change in which no new substance is produced e.g.

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Presentation transcript:

Physical & Chemical Change

Physical Change: a change in which no new substance is produced e.g.

Physical & Chemical Change Physical Change: a change in which no new substance is produced e.g. breaking glass tearing paper boiling water

Physical & Chemical Change Physical Change: a change in which no new substance is produced e.g. breaking glass tearing paper boiling water Chemical Change: a change in which a new, chemically different, substance is produced e.g.

Physical & Chemical Change Physical Change: a change in which no new substance is produced e.g. breaking glass tearing paper boiling water Chemical Change: a change in which a new, chemically different, substance is produced e.g. burning wood exploding a bomb corroding with acid

Physical & Chemical Change Evidence of a Chemical Change:

Physical & Chemical Change Evidence of a Chemical Change: 1. colour change

Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed

Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced

Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced 4. a precipitate (solid from two liquids) forms

Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced 4. a precipitate (solid from two liquids) forms 5. light is produced

Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced 4. a precipitate (solid from two liquids) forms 5. light is produced What about a light bulb?

Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced 4. a precipitate (solid from two liquids) forms 5. light is produced What about a light bulb? -colour change -heat produced -light produced

Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced 4. a precipitate (solid from two liquids) forms 5. light is produced What about a light bulb? -colour change -heat produced -light produced But... when turned off, it's still a light bulb! NOT A CHEMICAL CHANGE...

Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced 4. a precipitate (solid from two liquids) forms 5. light is produced Bottom line: a new, chemically different substance has to be produced