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Physical and Chemical Change. Clues of a Chemical Change A new colour appears eg. Oxygen Indicator Solution.

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Presentation on theme: "Physical and Chemical Change. Clues of a Chemical Change A new colour appears eg. Oxygen Indicator Solution."— Presentation transcript:

1 Physical and Chemical Change

2 Clues of a Chemical Change A new colour appears eg. Oxygen Indicator Solution

3 Clues of a Chemical Change Heat or light is given off A solid material (called a precipitate) forms in liquid

4 Clues of a Chemical Change The change is difficult to reverse Bubbles of gas are formed

5 Situation A piece of dry ice (solid carbon dioxide) is dropped into hot water. Large amounts of white vapour bubble out of the water. Physical Chemical  Explanation The bubbles are carbon dioxide gas. There was no chemical change. Just a change in state.

6 Situation Physical Chemical  When George’s father makes wine from crabapples, bubbles form on the surface of the yeast and fruit mixture. Explanation A chemical change from apple juice to wine, it is no longer the same compound.

7 Situation When margarine is left in a warm place for an extended period of time, it tastes sour. Physical Chemical Explanation The margarine is rotting, which is why it tastes sour. 

8 Situation Jane’s father opens up a new deodorant product. The room quickly smells like fresh flowers. Physical Chemical Explanation The deodorant is still deodorant, some particles have changed to vapour which we smell. 

9 Situation During a school volleyball game, Jennifer sprains her ankle. Her coach squeezes a bag at room temperature that quickly becomes very cold. Physical Chemical Explanation Inside the bag a chemical change has occurred which is endothermic. 


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