15. Using the text from above, what is the main difference between a physical and chemical change?
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16. With evidence from the text above, what are 3 different reactions that would demonstrate that a substance has undergone a chemical change?
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17. Why is melting ice a physical change and not a chemical change? Use the text for support.
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15. The main difference between a physical and chemical change is that a physical change only alters the physical properties of a substance, such as shape or state, without changing its chemical composition. In contrast, a chemical change results in the formation of new substances with different chemical properties.
16. Three reactions that would demonstrate a substance undergoing a chemical change include:
- Formation of a gas (bubbling or fizzing)
- Change in temperature (exothermic or endothermic)
- Formation of a precipitate (solid forming in a liquid solution)
17. Melting ice is considered a physical change because it only changes the state of water from solid to liquid without altering its chemical composition. The molecules in ice remain the same, just in a different arrangement when melted into water.