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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 (produced 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 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
Controlling rates of reaction: Concentration temperature surface area Catalysts Enzymes Inhibitors
Concentration (amount of one material in a given amount of another material)
Temperature (higher heat causes faster reactions)
Surface Area (increased surface area = 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 : 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 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 from another substance (also called displacement reaction)
States of Matter (pp. 46-50): solid, liquid, and 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: 150007946



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