Questions and Answers
What type of change is crushing a can?
What is the change when melting an ice cube?
What happens to water when it boils?
Is mixing sand and water a physical or chemical change?
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What type of change is breaking a glass?
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What occurs when dissolving sugar in water?
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What type of change is burning wood?
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Is souring milk a chemical change?
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What type of change is mixing acid and base?
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What occurs during digestion?
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Is cooking an egg a chemical change?
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What change occurs when heating sugar to form caramel?
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What type of change is baking a cake?
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What causes rusting of iron?
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What occurs during lighting a match?
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Study Notes
Physical Changes
- Crushing a can: Alters shape and size; material remains aluminum, indicating a physical change.
- Melting an ice cube: Energy added causes phase change from solid to liquid; retains original substance, a physical change.
- Boiling water: Bubbles form due to heat; water changes from liquid to gas but remains H2O, confirming a physical change.
- Mixing sand and water: Combination is physical; components can be separated by filtration or evaporation, maintaining original substances.
- Breaking glass: Physical stress affects intermolecular bonding but does not change molecular structure, resulting in a physical change.
- Dissolving sugar in water: Sugar remains when water evaporates, indicating a physical change.
Chemical Changes
- Burning wood: Creates new substances such as carbon dioxide and water vapor, irreversible process, signifying a chemical change.
- Souring milk: Involves conversion of lactose to lactic acid, characterizing a chemical change.
- Mixing acid and base: Acid-base indicators respond to changes in hydrogen ion concentration, demonstrating a chemical reaction.
- Digesting food: Enzymes break down macromolecules into simpler forms for absorption, exemplifying a chemical change.
- Cooking an egg: Heat denatures proteins, permanently altering texture and appearance, illustrating a chemical change.
- Heating sugar to form caramel: Sugar reacts with oxygen due to heat, forming new compounds and releasing energy in the form of smoke.
- Baking a cake: Chemical reactions produce gas bubbles from baking powder and transform egg proteins, resulting in a fluffy texture.
- Rusting of iron: Reaction between iron and oxygen forms iron oxide, a new substance, indicating a chemical change.
- Lighting a match: Physical action followed by burning is a chemical change due to chemical reactions that occur.
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Description
Test your knowledge on physical and chemical changes with this engaging quiz. Explore various examples such as melting ice and burning wood while understanding the properties that define these changes. Perfect for students studying basic chemistry concepts.
