Physical and Chemical Change

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Presentation transcript:

Physical and Chemical Change

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

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

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

Situation  Explanation 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.

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

Situation  Explanation 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.

Situation  Explanation 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.

Situation  Explanation 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.