SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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physical change
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chemical change
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neither
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None of the above
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Detailed explanation-1: -Physical changes change the shape, size or phase of a substance. Crumpling paper, getting a haircut, dissolving salt in water, melting wax, making ice cubes, chopping veggies for tossed salad, growing crystals from a supersaturated solution, grinding metal and slicing bread are all physical changes.
Detailed explanation-2: -Explanation: Physical changes. 1. Expansion of carbon dioxide. The carbon dioxide trapped in the dough expands as the temperature rises.
Detailed explanation-3: -Step 1: Identify what type of change is being asked. Step 2: If it is temporary and no new product is formed, then it is a physical change. On the other hand, if it is permanent and one or more new products are formed, then it is a chemical change.
Detailed explanation-4: -Melting an ice cube. Boiling water. Mixing sand and water. Breaking a glass. Dissolving sugar and water. Sublimation of dry ice. Crumpling a paper bag.