A material's ability to burn in the presence of oxygen
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proton
Front
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
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reactive
Front
Capable of readily undergoing a chemical change.
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transition metals
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Groups 3-12, 1-2 electrons in the outer energy level, less reactive than alsali-earth metals, shiny, good conductor of thermal energy and electrical current, high density
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Noble Gases
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Group 18, nonreactive because there outer energy level is full of valence electrons
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solubility
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The ability to dissolve in another substance
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chemical property
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A property that describes the ability of a substance to react with other materials and form new substances.
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atomic number
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The number of protons in the nucleus of an atom
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atomic mass
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# of protons + # of neutrons,
The average mass of all the isotopes of an element
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physical change
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A change of matter from one form to another without a change in chemical properties. solid, liquid, gas
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periods and groups
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Periods are the horizontal row (increasing mass), groups are the vertical columns (similar characteristics, also known as families)
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coefficient
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A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
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heterogeneous mixture
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A mixture in which different materials can be distinguished easily, can be separated
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alkaline earth metals
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metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive
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atom
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Basic unit of matter
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mixture
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A combination of two or more substances that are not chemically combined
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alkali metals
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Group 1, 1 electron in outer level, very reactive, soft, silver, shiny, low density; Lithium, Sodium, Potassium, Rubidium, Cesium, Francium
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nonmetal
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Element that is usually a gas or brittle solid at room temperature and is a poor conductor of head and electricity.
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valence electron
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The electrons in the outermost shell (main energy level) of an atom; these are the electrons involved in forming bonds.
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Law of Conservation of Mass
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the law that states that energy cannot be created or destroyed but can be changed from one form to another
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molecule
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Two or more atoms combine, The smallest particle of a substance that retains the chemical and physical properties of the substance
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element
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A pure substance made of only one kind of atom, can't be broken down into simpler substances
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nonreactive
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Not capable of readily undergoing a chemical change.
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metalloid
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Elements along the staircase. Have properties of both metals and nonmetals. Ex: Silicon
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compound
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A pure substance made of two or more elements CHEMICALLY combined.
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physical property
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A characteristic of a pure substance that can be observed without changing it into another substance
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metal
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an element that is shiny and that conducts heat and electricity well
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chemical change
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A change in matter that produces one or more new substances
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density
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A physical property. Specific to every element.
Mass / Volume
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balanced chemical equation
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A Chemical equation with the same number of atoms of each element on both side of the equation; The balancing process involves changing coefficients in a reaction to achieve
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electron
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A subatomic particle that has a negative charge
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homogenous mixture
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A mixture in which materials are blended evenly so theat the mixture is the same throughout; also called a solution
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product
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A substance produced in a chemical reaction
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polarity
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The type of charge an atomic particle has.
molecules have positive and negative sides
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neutron
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A subatomic particle that has no charge and that is found in the nucleus of an atom
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subscript
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A number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound.