Look at each picture and determine if a chemical or physical change is occurring. In your notes, justify your answer by typing why you picked chemical or physical.

Click on the images to check your answer.

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Chemical—wood in the presence of heat and oxygen reacts to form carbon dioxide, water vapor, and ash.

Source: Wood burning, Agalinks

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Physical—when glass breaks it is simply changing form. The broken pieces are still glass.

Source: Breaking Glass, whosadog, Flickr

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Chemical—a reaction is occurring between the zinc and the acid.

Source: Zinc dissolving in Acid, whosadog, Flickr

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Chemical—explosions of any type are generally the result of chemical reactions.

Source: Fireworks, Freefoto

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Physical—painting a substance only changes its appearance not its underlying composition.

Source: Man painting a house, Freefoto