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Chemical Reactions

TermDefinition
activation energy what is needed to start a chemical reaction
arrow read as yields in a chemical formula
characteristics of a chemical reaction changes in energy or properties
proof of chemical reaction gas produced (bubbles); color change; precipitate forms; temperature change; odor
chemical equations shorter, easier way to show chemical reactions by using symbols instead of words
coefficient number placed in front of a chemical formula in an equation. Tells how many atoms or molecules of each reactant and product take part in the reaction
conservation of mass the amount of matter involved in a chemical reaction does not change. The total mass of the reactants must equal the total moss of the products
controlling rates of reaction concentration; temperature; surface area; catalysts, enzymes and inhibitors
concentration amount of one material in a given amount of another material
temperature higher heat causes faster reaction
surface area increased surface area leads to increased reaction
catalysts materials that increases the rate of reaction
enzymes biological catalysts
inhibitors decreases the rate of a reaction
decomposition reaction a compound breaks down into simpler substances
endothermic reaction a reaction that takes heat from the solution, absorbs energy, makes it feel cooler
exothermic reaction a reaction that releases heat; gives off energy, makes it feel warmer
physical changes alter only the physical properties of matter; no new substances formed
chemical changes alter the chemical properties of matter; new substances with new properties are formed
proof of physical change change in size, shape, color, or phase of matter
precipitate a solid that forms from solution during a chemical reaction
products the materials you have after a chemical reaction; written on the right side of the formula
reactants the materials you have at the beginning of a chemical reaction; written on the left side of the formula
replacement reaction one part of a compound is displaced by an element or compound from another substance
states of matter solid, liquid or gas
subscripts show the number of atoms of an element in a molecule or the ratio of elements in a compound
synthesis reaction two substances combine to form a new compound
Created by: sjordan529
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