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# Physical and Chemical Changes This document lists various changes in substances and classifies them as either physical (P) or chemical (C) changes. It includes a brief reason for each classification. ## Table of Changes | Change | Category | Reason | |---|---|---| | Rusting iron | C | A change...

# Physical and Chemical Changes This document lists various changes in substances and classifies them as either physical (P) or chemical (C) changes. It includes a brief reason for each classification. ## Table of Changes | Change | Category | Reason | |---|---|---| | Rusting iron | C | A change in color and odor | | Toasting bread | P | It's reversible | | Evaporating water | P | A change in state, liquid to gas | | Burning a candle | P | Solid to liquid | | Frost on a car window | P | It is condensation | | Boiling water | P | It is evaporating | | Formation of clouds | P | Because of evaporation, the clouds are forming | | Baking a cake | C | Change in color, odor; ingredients cannot be separated | | Breaking a stick | P | Change in size | | Wax melting | P | Change in state | | Frying an egg | P | It can be reversed| | Bomb exploding | C | Gas is emitted and light comes out | | Sulphur burning | C | A new substance is formed | | Sugar dissolving | P | The sugar is dissolving | | Jello setting | P | It's going from liquid to solid | | Bread going mouldy | C | Change in odor and it can't be reversed | | Leaves changing color | P | It can be reversed | | Firefly glowing | C | Substances make a reaction which makes the firefly glow | | Silver tarnishing | C | The reaction is making a new substance| | Making ice cubes | P | Change in state, it is going from liquid to solid | | Baking a potato | P | A change in size and shape | | Sanding a piece of wood | C | Change in color| | Mixing baking soda and vinegar | C | A new substance is formed | **Note:** Some reasons are brief summaries of the more detailed explanations given in the table.