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30 Cards in this Set
- Front
- Back
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Mass
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the amount of matter the object contains
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Pure Substance
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matter that has a uniform and definate composition; contains only one type of matter
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Physical Property
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a quality or condition of a substance that can be observed or measured, that does not change the composition of the substance; i.e. color, solubility, odor, hardness, density
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3 States of Matter
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Solid, liquid, gas
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Solid
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matter that has definite shape and volume; slight expansion on heating; almost incompressible
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Liquid
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a form of matter that flows, has a fixed volume and takes the shape of the container; expands when heated but incompressisble; has surface tension
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Gas
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a form of matter that takes both the shape and volume of its container; easily compressed; limited to those substances that exist in the gaseous state at ordinary room temperature
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Vapor
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a substance which is generally a liquid or solid at room temperature (ie steam)
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Physical Changes
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change which alters a materiel without altering the chemical composition of the material
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Examples of Physical Changes
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cutting, grinding, bending, melting, freezing, dissolving
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Mixture
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a physical blend of two or more substances in which the composition may vary
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2 Kinds of Mixtures
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1. Heterogeneous
2. Homogeneous |
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Heterogeneous Mixture
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type of mixture that is NOT uniform in composition
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Homogeneous Mixture
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type of mixture that is uniform in composition; its components are evenly distributed throughout the entire sample
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Homogeneous mixtures can also be called.......and can exist as solid, liquid or gas
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solutions
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Phase
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any part of a system with uniform composition and properties
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How many phases does a homogeneous mixture have?
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one
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How many phases does a heterogeneous mixture have?
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multiple
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Distillation
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when a liquid is boiled to produce a vapor that is then condensed into a liquid again
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Elements
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simplest form of matter that exist under normal laboratory conditions
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Conditions of elements
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cannot be seperated into simpler substances by chemical means, are the building blocks for all other substances
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Compound
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two or more elements that combine chemically with one another
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Conditions of compounds
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substances can be seperated by chemical needs
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How can you differniate between a homogeneous mixture and substance?
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ask yourself if this is a single type of material with a chemical formula that describes it
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Chemical Reaction
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one or more substances change into new substances
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Reactants
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starting substances
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Products
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the substances formed
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Chemical Property
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ability of a substance to undergo a chemical reaction and to form new substances
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Signs that a chemical reaction has occured
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1.energy is absorbed or given off 2.a change in odor or color 3.irreversability- most chemical changes are not easily reversed
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Law of Conservation of Mass
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mass is neither created or destoryed; it is conserved
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