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Chemical reactions

TermDefinition
Activation Energy What is needed to start a chemical reaction
Arrow you read the arrow says "yields" in a chemical equation or formula
Characteristics of a chemical reaction changes in energy or changes in properties
Chemical Changes alter the chemical properties of matter; new substances with new properties are formed
Chemical Equations a shorter, easier way to show chemical reactions by using symbols instead of words
Coefficient a 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 mass of the products
Decomposition Reaction a compound breaks down into simpler substances
Exothermic an observable change in energy that shows a chemical reaction took place; a reaction that releases heat; gives off energy, makes it feel warmer; most chemical reactions are this type
Endothermic an observable change in energy that shows a chemical reaction took place; a reaction that takes heat from the solution, absorbs energy, makes it feel cooler
Physical changes Alter only the physical properties of matter; no new substances are forms
Precipitate a solid that forms from solution during a chemical reaction; observable change that shows a chemical reaction took place.
products the materials you have after a chemical reaction; written on the right side
reactants the materials you have at the beginning of a chemical reaction; written on the left side
Replacement Reaction one part of a compound is displaced by an element or compound from another substance.
States of matter solid, liquid,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.
Concentration amount of material in a given amount of another material
catalyst materials that increases the rate of reaction
Created by: 150007713
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