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Chemical Reactions

Chapter 5 pg. 144-165

TermDefinition
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 change)
Chemical Changes alter the chemical properties of matter; new substances with new properties are formed
Chemical Equation a shorter, easier way to show chemical reaction sby 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
Controlling Rates of Reaction concentration, temperature, surface area, catalysts, enzymes, and inhibitors
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 a change in size, shape or color; change in phase ( by increasing or decreasing temperature: solid, liquid, gas)
Precipitate a solid that forms from solution during a chemical reaction; observable change that shows a chemical reaction that 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
Replacement Reaction one part of a compound is displaced by an element or compound form another substance ( also called displacement reaction)
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 (also called composition reaction)
Created by: 150008397
 

 



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