Questions and Answers
What is a physical change?
A change of matter from one form to another without a change in chemical properties.
What is a chemical change?
A change that occurs when one or more substances change into entirely new substances with different properties.
What does the Law of Conservation of Mass state?
Mass cannot be created or destroyed in ordinary chemical or physical changes.
What is an example of a chemical change?
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What is an example of a chemical change involving metal?
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What is an example of a physical change?
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What happens to a crushed Coca-Cola can?
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What does ripped wallpaper demonstrate?
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What does a rusted doorknob illustrate?
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What is an example of a chemical change related to photosynthesis?
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What occurs during the hard-boiling of eggs?
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What does digestion inside the stomach demonstrate?
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What happens to boiling water?
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What occurs during evaporation?
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What is an example of a physical change when it relates to freezing?
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What does cutting a kiwi into pieces demonstrate?
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What does baking a cake represent?
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What happens during the melting of ice?
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What does stirring water demonstrate?
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Study Notes
Definitions
- Physical Change: Transformation of matter from one state to another without altering chemical properties.
- Chemical Change: Process where substances convert into new entities with distinct properties.
Laws and Principles
- Law of Conservation of Mass: States mass remains constant during ordinary physical or chemical transformations; it cannot be created or destroyed.
Examples of Chemical Changes
- Burning Wood: Converts wood into ash and carbon dioxide.
- Rust Formation: Absence of protective layers leads to oxidation, exemplified by the Statue of Liberty.
- Rusted Doorknob: Represents a common occurrence of metal oxidation.
- Photosynthesis: Process evident in the changing colors of leaves during autumn.
- Digestion: Transformation of food into waste products inside the stomach.
- Baking a Cake: Heat application leads to new substances through chemical bonds.
Examples of Physical Changes
- Broken Window: No new substances are created despite physical alteration.
- Crushed Coca-Cola Can: Maintains original material properties without generating new substances.
- Ripped Wallpaper: Physical alteration without chemical transformation.
- Boiling Water: Change of state from liquid to gas, no new substance formed.
- Evaporation: Liquid turning into vapor, yet remains chemically the same.
- Freezing: Transition from liquid to solid state without changing composition.
- Kiwi Being Cut: Physical division of fruit, with no new chemical formations.
- Ice Melting: Conversion from solid to liquid, remaining as water.
Neutral Changes
- Stirring Water: No physical or chemical change occurs; the substance's properties remain unchanged.
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Description
Explore the concepts of physical and chemical changes with this set of flashcards. Understand the definitions, key laws like the Conservation of Mass, and how matter transforms in different contexts. Perfect for students studying chemistry or related sciences!
