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19 Cards in this Set
- Front
- Back
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Substance
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A type of matter with a fixed composition. More than 9 million known
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What is an element?
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Atoms in a sample that are all alike. Elements are made from atoms
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How many elements are there?
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113 known elements. 92 elements are natural
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What is a compound?
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Made from atoms of 2 or more elements
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What is a mixture?
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Made of 2 or more substances. Substances are not necesarily present in the same ratio
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What is a Homogeneous Mixture?
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A mixture that is evenly mixed throughout.
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What are particles like in a homogeneous mixture?
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Don't settle, and are so small that the eye cannot see them.
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What is a Colloid?
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All components are not in the same phase. Liquid in a solid. Gas in a liquid.
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What is a Solution?
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All substances are in the same phase. Oxygen, Nitrogen, Other = air.
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What is a heterogeneous mixture?
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Unevenly mixed, samples have parts with different composition, and you can see individual particles.
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What is a Suspension?
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Components in different phases, particles will not settle. Italian dressing, muddy water, smoothie
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What is the Tyndall Effect?
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The scattering of light by particles
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What are physical properties?
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color, size, shape, density, state of matter, taste, mass, odor, solubility, elasticity
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What are physical changes?
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When an object changes size, shape, color, state of matter... Substances do not change. No new substances formed
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What are chemical properties?
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When wood burns, produces carbon dioxide and water vapor
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What are chemical changes?
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Change of one substance into a different substance
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What is distillation?
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To separate a solid from a liquid, such as salt or seawater...a process using the physical properties of boiling point
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What is the law of conservation of mass?
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When an object is changed, its mass is always teh same. Mass is neither added nor destroyed
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What is weathering?
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When objects change due to natural causes.
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