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MTCES.8 -Sc.1.2.V

matter anything that has mass and takes up space
chemistry the study of the properties of matter and how it changes
physical property a characteristic of a substance that can be observed without changing the substance into another (color, hardness, texture, shine, flexibility)
chemical property a characteristic of a substance that descibes its ability to change into other substances (burning, rusting, tarnishing)
physical change a change that distorts the form or appearance of a substance without changing it into another substance
chemical reaction a change in matter that produces more new substances
precipitate a solid that forms during a chemical reaction
endothermic reaction a reaction that absorbs energy in the form of heat
exothermic reaction a reaction that releases energy in the form of heat
chemical equation a short, easy way to show a chemical reaction
reactant(s) the substance(s) you have before a chemical reaction
product(s) he substance(s) you have at the end of a chemical reaction
conservation of mass during a chemical reaction, matter is not created or destroyed, just rearranged
open system a system in which matter can enter from or escape into its surroundings
closed system a system in which matter can't enter or leave
coefficient a number placed in front of a chemical formula in an equation, it multiplies the formula by that number
synthesis 2 or more elements combine
decomposition breaks down compounds
replacement elements rearrange and trade places
actavation energy the minimum energy needed to start a chemical reaction
concentration the amount of a substance in a given volume
catalyst a material that increases the rate of a reaction by lowering the activation energy
enzymes biological catalysts that lower actavation energy in cells
inhibitor decreases the rate of a reaction by preventing reactants from coming together
combustion a rapid reaction between oxygen and a fuel
fuel a material that releases energy when it burns ie)oil, wood, gas, paper
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