Question
Part A Can you recognize the chemical and physical changes that happen all around us? If you change the way something looks, but haven't made a new substance, a physical change (P) has occurred. If the substance has been changes into another substance, a chemical change (C) has occurred. square square
Answer
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Jasper
Master · Tutor for 5 years
Answer
1. P2. C3. C4. P
Explanation
1. **Ice Cube Melting and Evaporating**: Initially, the ice cube melts into water, and then the water evaporates. Both melting and evaporation are physical changes as no new substance is formed. (P)2. **Mixing Chemicals Producing Gas**: When two chemicals mix and produce a gas, it indicates a chemical reaction where new substances are formed. (C)3. **Bicycle Rusting**: Rusting involves the reaction of iron with oxygen to form iron oxide, a new substance. This is a chemical change. (C)4. **Crushing a Solid**: Crushing a solid into a powder changes its form but not its chemical composition. This is a physical change. (P)