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30 Cards in this Set

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