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Chemical Reactions

Activation Energy What is needed to start a chemical reaction
Arrow you read the arrow as "yields" in a chemical equation or formula
Characteristics of a Chemical Reaction changes in energy or changes in properties (produce a gas(bubbles form), color change,precipitate forms or temperature.
Chemical Changes alter the chemical properties of matter; new substance 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 a 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
Endothermic Reaction 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
Exothermic Reaction 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.
Physical Changes alter only the physical properties of matter; no new substances are formed. Can be changed in size, shape, color
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 of the formula
Reactants the materials you have at the beginning of a chemical reaction; written on the left side of the formula
Replacements Reaction one part of a compound is displaced by an element or compound from another substance
States of Matter solid, liquid, gas
Subscript 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: Shlynv