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Questions and Answers
Which category does matter fall into?
Which category does matter fall into?
- Pure substances
- Impure substances (correct)
- Elements
- Compounds
What are pure substances made up of?
What are pure substances made up of?
- Different types of particles
- Particles of the same type (correct)
- Elements and compounds
- Mixtures
Why are elements and compounds considered pure substances?
Why are elements and compounds considered pure substances?
- Because they are made up of different types of particles
- Because they are mixtures
- Because they are made up of only one type of particle (correct)
- Because they are impure substances
What are mixtures made up of?
What are mixtures made up of?
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Give an example of a pure substance.
Give an example of a pure substance.
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Which of the following is NOT a basic concept of chemistry?
Which of the following is NOT a basic concept of chemistry?
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What is the difference between pure substances and impure substances?
What is the difference between pure substances and impure substances?
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Why are elements and compounds considered pure substances?
Why are elements and compounds considered pure substances?
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Which of the following is an example of a pure substance?
Which of the following is an example of a pure substance?
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Which of the following is NOT an example of a mixture?
Which of the following is NOT an example of a mixture?
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Study Notes
Classification of Matter
- Matter can be categorized into pure substances and mixtures
Pure Substances
- Made up of only one type of particle (atom or molecule)
- Elements and compounds are considered pure substances because they have a fixed composition and properties
- Examples: oxygen (O2), water (H2O), sugar (C6H12O6)
Mixtures
- Made up of two or more different substances, not chemically combined
- Properties and composition can vary
Basic Concepts of Chemistry
- The concept of "mole" is a basic concept of chemistry
- "Mass" is a basic concept of chemistry
- "Matter" is a basic concept of chemistry
- "Energy" is a basic concept of chemistry
- "Particle" is NOT a basic concept of chemistry
Pure vs Impure Substances
- Pure substances have a fixed composition and properties, while impure substances have varying composition and properties
- Pure substances are homogeneous, while impure substances are heterogeneous
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