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Dr. H Matter Intro

Dr. Heiny: Introduction to Matter

Alloy A substance that contains a mixture of elements and has metallic properties.
Atom the fundamental unit of which elements are composed.
Chemical change the change of substances into other substances through a reorganization of the atoms; a chemical reaction.
Chemical properties Exhibited by matter as it undergoes changes in composition; The ability of a substance to change to a different substance.
Chromatography Any of various techniques for the separation of complex mixtures that rely on the differential affinities of substances for a gas or liquid mobile medium and for a stationary adsorbing medium through which they pass, such as paper, gelatin, or magnesia.
Compound A pure substance with constant composition that can be broken down into elements by chemical processes.
Density A property of matter representing the mass per unit volume. Density is a derived unit.
Distillation -a method for separating the components of a liquid mixture that depends on differences in the ease of vaporization of the components.
Elements A pure substance that cannot be decomposed into simpler substances by chemical or physical means. It consists of atoms all having the same atomic number.
Extensive properties A non inherent property of a system, such as volume or internal energy, that changes with the quantity of material in the system; the quantitative value equals the sum of the values of the property for the individual constituents
Filtration A method for separating the components of a mixture containing a solid and a liquid.
Intensive properties properties independent of the quantity or shape of the substance under consideration; for example, temperature, pressure, or composition.
Gas One of the three states of matter; has neither fixed shape nor fixed volume.
Heterogeneous mixture A mixture that has different properties in different regions of the mixture.
Homogeneous mixture A mixture that is the same throughout; a solution.
Law of conservation of energy energy can be converted from one form to another but can be neither created nor destroyed.
Law of definite composition Also known as the Law of Constant Composition; The law that a given chemical compound always contains the same elements in the same fixed proportion by weight.
Liquid one of the three states of matter; has a fixed volume but takes the shape of its container.
Matter The material of the universe; anything that has mass and occupies space.
Mixture A material of variable composition that contains two or more pure substances. Each component in the mixture retains its own properties.
Molecule a bonded collection of two or more atoms of the same element or different elements.
Physical change a change from one state (solid or liquid or gas) to another without a change in chemical composition
Physical properties A characteristic of a substance that can be observed in the absence of change; that is, without the substance becoming a different substance.
Pure substances A substance with constant composition.
Reaction a change or transformation in which a substance decomposes, combines with other substances, or interchanges constituents with other substances
Solid one of the three states of matter; has a fixed shape and volume.
Solution a homogeneous mixture.
States of matter The three different forms in which matter can exist: solid, liquid, and gas
Created by: LPH