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Keenan - Unit 3 - S8

Vocabulary Science 8: Matter & Chemical Properties

Atom basic building block of matter and consists of 3 basic particles (protons, neutrons, electrons)
Elements pure substances that cannot be changed into simpler substances and are composed of one kind of atom
Compounds pure substances that are composed of two or more types of elements that are chemically combined and can only be changed into elements through chemical changes
Mixtures two or more substances physically combined; easy to separate.
Heterogeneous mixtures are not uniform and the component substances can be visibly distinguished
Homogeneous mixtures are uniform throughout and the substances are evenly mixed and cannot be visibly distinguished.
Conductivity The ability of a substance to move electrons
Reactivity The potential for 2 or more atoms to chemically combine
Metals are conductors that are strong, shiny, hard and malleable.
Nonmetals are gasses or solids and are not good conductors. They are brittle.
Metalloids An element that has properties of both metals and nonmetals
Period Table An arrangement of the elements according to properties and structure
Solubility The ability of a substance to be dissolved into another substance
Density Mass per unit volume; crowdedness; d= m/v;
melting point The temperature when a solid changes to a liquid
boiling point The temperature when a liquid changes to a gas
Law of Conservation of Mass matter cannot be created nor destroyed



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