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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 properties (produce a gas (bubble form) color change,precipitate forms or temperature change)
Chemical Change 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 a equation. tells how many the total mass of the reactant and product take part in 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 of rates of reactions Controlling, temperature ,surface area,catalysts,enzymes
Decomposition A compound breaks into simpler substances
Endothermic Reaction An observation 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 observation change in energy that shows a chemical reaction took place 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
Precipitate A solid that forms from solution during a chemical reaction; observable change shows a chemical reaction took place.
Products the materials you have after a chemical reaction; written on the right side of the formula
Reactants 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 States of Matter (pp. 46-50): solid, liquid, and gas
Subscripts: 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: johnbon