Asked by ally
Which is an example of a chemical change to matter? 1. A rock cracks apart as it falls down a cliff. 2. Meat and vegetables are roasted in the oven. 3. Liquid water freezes into ice. or 4. Sugar is mixed into a glass of water.
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Answer: 2. Meat and vegetables are roasted in the oven.
Reason: Roasting causes chemical reactions (protein denaturation, Maillard browning, oxidation) that form new substances, change color and odor, and are not simply reversible. The others are physical changes: a rock cracking is mechanical breakage, water freezing is a phase change, and sugar dissolving is a physical mixing/dissolution.
Reason: Roasting causes chemical reactions (protein denaturation, Maillard browning, oxidation) that form new substances, change color and odor, and are not simply reversible. The others are physical changes: a rock cracking is mechanical breakage, water freezing is a phase change, and sugar dissolving is a physical mixing/dissolution.
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