23 terms

Chapt 3-Classification of Matter

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Homogeneous matter
Has identical properties throughout
Heterogeneous matter
Matter that has parts with different properties
Mixture
Matter with two or more substances mixed together but not chemically combined
Heterogeneous Mixture
'Least mixed' of all mixtures. Mixture that doesn't appear to be the same throughout.
Homogeneous Mixture
'Well mixed'. Mixture that appears to be the same throughout. (Particles are very small and not easily recognized)
Solution
'Best mixed'. Type of homogeneous mixture formed when one substance dissolves into another
Alloys
Metal solutions where solids are dissolved into solids
Pure substance
Made of only one kind of material with definite properties. (Homogeneous matter)
Element
The simplest pure substance. They cannot be broken down into simpler substances. (Beware: Not all pure substances are elements)
Atom
The smallest particle of an element with all of the same properties.
Chemical Symbols
Representation of elements. (If two letters make up a symbol, the 1st letter is capitalized followed by a lower case letter)
Compound
Two or more elements chemically combined. (Ex. Sugar, Oxygen, Carbon Dioxide)
Molecules
Two or more atoms chemically bonded together. The smallest part of a compound that has all the properties of the compound.
Chemical Formulas
Combinations of chemical symbols. Most represent compounds.
Subscripts
Small number written to the right side of an element in a chemical formula.
Chemical Equation
Description of a chemical reaction using symbols.
Coefficient
The number placed in front of (left side) the chemical symbol in order to balance the equation.
Solvent
Substance that does the dissolving
Solute
Substance that is dissolved in the solution
Insoluble
Substance that doesn't dissolve in water (oil)
Soluble
Substance that will dissolve in water (sugar, etc)
Suspensions
Heterogeneous mixture that can separate over time, generally cloudy or with floating particles that are visible to the eye (You can filter out particles)
Colloids
Particle sizes are between a solution and a suspension (particles cannot be filtered out) Ex. Fog (It will scatter light)
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