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Questions and Answers
Which of the following is a pure substance?
Which of the following is a pure substance?
- Sugar (correct)
- Sand
- Air
- Milk
What type of mixture is air?
What type of mixture is air?
- Colloid
- Compound
- Solution (correct)
- Suspension
Which of the following changes is reversible?
Which of the following changes is reversible?
- Cooking an egg
- Rusting of iron
- Melting of ice (correct)
- Burning of paper
What happens to the mass of a substance during a physical change?
What happens to the mass of a substance during a physical change?
Flashcards
Pure Substance
Pure Substance
A substance that has a fixed composition and uniform properties throughout.
Solution (Mixture)
Solution (Mixture)
A homogeneous mixture where one substance (solute) is dissolved evenly in another (solvent).
Reversible Change
Reversible Change
A change in the form of a substance but not its chemical composition. It can be reversed by changing conditions.
Mass Conservation (Physical Change)
Mass Conservation (Physical Change)
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Study Notes
Pure Substances and Mixtures
- A pure substance is a material that has a fixed composition and properties.
- Examples of pure substances include elements (e.g., oxygen, iron) and compounds (e.g., water, salt).
Types of Mixtures
- Air is a homogeneous mixture, meaning it has a uniform composition throughout.
Physical and Chemical Changes
- A reversible change is a physical change that can be undone, such as melting and freezing of water.
- Physical changes do not alter the composition of a substance, and the mass of a substance remains constant during a physical change.
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