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What Are Three Signs That A Chemical Change Has Taken Place?

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Color change, release of gas, light, odor change, chemicals burning, change in state, explosion, new substance formation
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Color change, release of gas, light, odor change, chemicals burning, change in state, explosion, new substance formation
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Colour change, explosion,change in weight/mass, change in odour, change in concentration, change in intensity, noise, bubbles, product being produced, crystallisation

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