Questions and Answers
What are the 2 classes of matter?
What is a mixture?
A blend of 2 or more substances not chemically combined.
What is a pure substance?
A substance made up of only one type of particle; an element or compound.
What is an element?
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What is a compound?
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What are types of mixtures?
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What is a homogeneous mixture?
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What is a heterogeneous mixture?
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Name 3 sub-types of mixtures.
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What is a solution mixture?
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What does aqueous mean?
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What is a suspension mixture?
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What is a colloid mixture?
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How do you identify a solution?
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How do you identify a colloid?
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How do you identify a suspension?
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Study Notes
Classes of Matter
- Matter is categorized into two main classes: mixtures and pure substances.
Mixtures
- Mixture: A blend of two or more substances that are not chemically combined.
- Mixtures can be separated using physical methods, allowing individual substances to retain their properties.
Pure Substances
- Pure substance: Composed solely of one type of particle, which can be either an element or a compound.
Elements
- Element: The basic building block of matter, represented by a unique chemical symbol—each element consists of one type of atom.
Compounds
- Compound: Formed by the chemical combination of two or more elements in a specific ratio. Examples include water (H2O) and hydrogen peroxide (H2O2).
Types of Mixtures
- Mixtures can be classified into homogeneous and heterogeneous types.
Homogeneous Mixture
- Homogeneous mixture: Uniform composition throughout, with components evenly distributed.
Heterogeneous Mixture
- Heterogeneous mixture: Non-uniform composition where different components can be distinguished visually.
Sub-types of Mixtures
- Three sub-types of mixtures include:
- Solution
- Suspension
- Colloid
Solution Mixture
- Solution: A homogeneous mixture where a solute (small particles) dissolves in a solvent (the substance that dissolves the solute).
Aqueous Solutions
- Aqueous solution: A solution in which water serves as the solvent.
Suspension Mixture
- Suspension: A heterogeneous mixture with larger particles that settle when left undisturbed. Examples include salad dressing, ketchup, and peanut butter.
Colloid Mixture
- Colloid: A mixture with medium-sized particles that remain suspended without settling, exhibiting properties of both homogeneous and heterogeneous mixtures. Examples include juice, milk, and hair conditioner.
Identifying Mixtures
- Solution: Clear and transparent, allowing light to pass through.
- Colloid: Cloudy and translucent, causing light to scatter.
- Suspension: More opaque and cloudy, preventing light from passing through.
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Test your knowledge on the classification of matter with these flashcards. Learn about the differences between mixtures and pure substances, and understand key concepts like elements and compounds. Perfect for students studying chemistry at any level.
