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Questions and Answers
What is a physical change?
What is a physical change?
A change where no new substance is formed and the original substance retains its chemical properties.
Give an example of a physical change.
Give an example of a physical change.
Breaking a plate.
Which of the following is not a physical change?
Which of the following is not a physical change?
- Melting ice
- Crushing a rock
- Rusting iron (correct)
- Dissolving sugar in water
A chemical change results in the formation of new substances.
A chemical change results in the formation of new substances.
What occurs when a solid melts to form a liquid?
What occurs when a solid melts to form a liquid?
Which of the following is an example of a chemical change?
Which of the following is an example of a chemical change?
A mixture created by mixing different materials without them reacting is called a ______.
A mixture created by mixing different materials without them reacting is called a ______.
What happens during a chemical reaction?
What happens during a chemical reaction?
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Study Notes
Physical Change
- A physical change alters the appearance or behavior of a substance without forming a new substance.
- Breaking a plate exemplifies a physical change; the plate looks different but remains the same material.
- Common instances of physical changes include:
- Breaking or crushing materials into smaller pieces.
- Changes of state, such as melting a solid into a liquid or boiling a liquid into a gas.
- Creating mixtures by combining different materials that do not react chemically.
- Dissolving substances, such as sugar in water, where characteristics of both substances change without the formation of new substances. Sugar can be recovered by evaporating the water.
- Separating mixtures, as in filtering sand from water or distilling fresh water from seawater.
Chemical Change
- A chemical change results in the formation of new substances and signifies a chemical reaction.
- Cooking dough transforms it into bread, demonstrating a chemical change; the original dough cannot be recovered.
- Chemical changes are observable in everyday life through various processes, such as:
- Cooking food (e.g., baking or frying).
- Ripening of fruits and vegetables.
- Decay of living organisms.
- Burning materials (e.g., fire).
- Explosive reactions.
- Corrosion of metals (e.g., rusting iron).
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