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Matter & Mixtures: Chemical and Physical Change (1 of 4) |
Physical changes do not result in new substances (e.g., melting ice, grinding chalk). Chemical changes result in new substances being formed (e.g., burning paper, photosynthesis). Physical changes can be easily reversed. Chemical changes are more difficult to reverse. Chemical changes involve a chemical reaction. Bonds between atoms break and new bonds form making new compounds. Evidence of a chemical change can be light, color changes, heat being produced, bubbles, or a new smell. |
