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Chemical Reactions

Chemical Reaction A change in which 1 or more substances are converted into new substances.
Chemical Equation A way to describe a Chemical Reaction using chemical formulas and other symbols.
Balanced Chemical Equation has the same # of atoms of each element on both sides of the equation.
Chemical Reactions and Energy there is always an energy change when a chemical reaction occurs
Temperature when the temp. increases ,the rate of the reaction increases.
Concentration when reactants are more concentrated , the rate of chemical reaction will increase.
Surface Area when the surface area of the reactants increases, the reaction rate increases.
Catalyst a catalyst lowers the amount of energy needed to start a reaction.
Synthesis 2 or more substances combine to form another substance.
Decomposition 1 substance breaks down, or decomposes, into 2 or more substances.
Endothermic Reaction A reaction that gives off energy
Exothermic Reaction A reaction that absorbs energy
States of Matter Solid, liquid, gas
Activation Energy What is needed to start a chemical reaction
Arrow -----> you read the arrow as “yields” in a chemical equation or formula
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
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.
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
Created by: 150015595



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