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Physical and Chemical Change

Learn to identify chemical changes through clues like color alterations, heat release, gas bubble formation, and irreversible transformations in various scenarios. Understand the difference between physical and chemical changes with practical examples.

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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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