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chemistry the science of matter
matter any object that has mass and occupies space
theory a well established hypothesis
scientific law a statement of natural phenomenon where no exceptions are known under any given circumstances
amorphous solids solid without shape or form
gas indefinite volume and no fixed shape
attractive forces hold the particles together and give matter its appearance of continuity; strongest in solids, giving them rigidity, weaker in liquid, and weakest in gases.
pure substance a definite, fixed composition and is either an element or a compound
homogeneous mixture
heterogeneous matter consists of two or more physically distinct phases
phase a homogeneous part of a system separated from other parts by a physical boundary
mixture a combination of two or more pure substances and can be homo or heterogeneous
scientific notation a way to write very large or small numbers (measurements) in a compact form
measurement a quantitative observation
metric or international system standard system of measurements for mass lengths, time and other physical quantities
meter standard unit of length of metric system
element fundamental substance that cannot be broken down by chemical means into simpler substance; building blocks of matter
atom smallest unit of an element that retains its properties and chemical behavior; made of subatomic particles
Dimitri Mendeleev developed the periodic table in 1869
metals solids at room temperature (except mercury); shiny, good conductors of heat and electricity; malleable (can be shaped); ductile; have a high melting point and density
nonmetals not shiny; have fairly low melting points and densities; poor conductors of heat and electricity; can combine with each other to form molecullar compounds
metalloids have properties between metals and nonmetals
compound a substance containing two or more elements that are chemically combined in a definite proportion; decompose chemically into simpler
Created by: danat214