Question
Physical and Chemical Changes 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 square
Answer
4.4
(264 Votes)
Jara
Elite · Tutor for 8 years
Answer
1. \( (P) \) 2. \( (C) \)3. \( (C) \)4. \( (P) \)
Explanation
1. An ice cube melting and then evaporating is a physical change \( (P) \) because it involves a change in state (solid to liquid to gas) without altering the chemical composition of the water.2. Mixing two chemicals and producing a gas is a chemical change \( (C) \) as it results in the formation of a new substance (gas).3. A bicycle rusting is a chemical change \( (C) \) because rust (iron oxide) is a new substance formed from the reaction between iron and oxygen in the presence of water or moisture.4. Crushing a solid to powder is a physical change \( (P) \) since the substance remains chemically the same, only its form has changed.