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Physical and Chemical Change

Physical and Chemical Change. Clues of a Chemical Change. A new colour appears eg. Oxygen Indicator Solution. Clues of a Chemical Change. Heat or light is given off. A solid material (called a precipitate) forms in liquid. Clues of a Chemical Change. The change is difficult to reverse.

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Physical and Chemical Change

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  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 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.

  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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