chemical_reactions_powerpoint_2010

chemical_reactions_powerpoint_2010 - Chemical Reactions...

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Unformatted text preview: Chemical Reactions Nature of Chemical Reactions Types of Chemical Reactions Synthesis Reactions Decomposition Reactions Single-Replacement Reactions Double-Replacement Reactions Combustion Reactions Identifying Oxidation-Reduction Reactions Nature of Chemical Reactions Objectives 1. Define chemical Reactions. 2. Describe four indications that a chemical reaction has occurred. 3. State the law of conservation of mass and describe how it relates to a chemical reaction. 4. Identify and use the common symbols used in writing chemical equations. 5. Translate chemical equations into word equations. 6. Translate word equations into chemical equations. 7. Balance chemical equations. Back to main menu Characteristics of Chemical Reactions A chemical reaction is a process in which the chemical and physical properties of the original substance changes as new substances with different physical and chemical properties are formed. Back to main menu Characteristics of Chemical Reactions In any chemical reaction, there are always two kinds of substances; the substances that are present before the change, called the reactants , and the substances that are formed by the change, called the products . Reactants Products Back to main menu Identifying Reactants and Products Identify the reactants and products in the following equation: 2Al( s ) + 3Cl2( g ) 2AlCl3(s) reactant(s) products(s) Back to main menu Al, Cl2 AlCl3 Indications of a Chemical Reaction What are the four observations that generally indicate that a chemical reaction has occurred? 1. Production of a gas . 2. Formation of a precipitate . (an insoluble solid that forms in an aqueous reaction) 3. Change in energy . Endothermic reaction energy is absorbed Exothermic Reaction energy is released 4. Change in color or odor . Back to main menu Law of Conservation of Mass Chemical equations are balanced to satisfy the Law of Conservation of Mass The Law of Conservation of Mass states that mass cannot be created or destroyed by ordinary physical or chemical means. This means that the total mass of the reactions must equal the total mass of the products. Back to main menu Law of Conservation of Mass Remember that atoms dont change in a chemical reaction; they just rearrange. For a chemical equation to accurately represent a reaction, the same number of each kind of atom must be on the left side of the arrow as are on the right side. Back to main menu Symbols Used in Chemical Equations + Used to separate two reactants or two products yields, separates reactants from products Used in place of a for reversible reactions ( s ) Designates a reactant or product in the solid state ( l ) Designates a reactant or product in the liquid state ( aq ) Designates an aqueous solution, the substance is dissolved in water....
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This note was uploaded on 01/15/2012 for the course CHEM 101 taught by Professor Curtis during the Spring '11 term at Austin Community College.

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chemical_reactions_powerpoint_2010 - Chemical Reactions...

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