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Chemical Reactions and Stoichiometry Azamat Amzebek

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Topics covered Molecular weight and Molar Mass Representation of Compounds Types of Chemical Reactions Net ionic Equations Balancing Equations Applications of Stoichiometry Limiting Reactants

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Compounds Compound – pure substance that is composed of two or more elements in a fixed proportion All elements, except some of the noble gases, can react with other elements to form compound

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Molecular weight and Molar mass A molecule is a combination of two or more atoms held together by covalent bonds. The molecular weight is simply the sum of the weights of the atoms that make up the molecule MOLAR MASS = MOLECULAR WEIGHT Number of moles = weight of sample (g) / molar mass(g/mol)

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Representation of compounds Law of Constant Composition – any sample of a given compound will contain the same elements in the identical mass ratio Empirical formula gives the simplest whole number ratio of the elements in the compound. The molecular formula gives the exact number of atoms of each element in a molecule of the compound

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Percent composition It is the weight percent of the element in a specific compound.

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Types of chemical reactions 1. Synthesis Reactions Two or more reactants form one product

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Types of chemical reactions 2. Decomposition Reactions One in which a compound breaks down into two or more substances, usually as a result of heating

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Types of chemical reactions 3. Single Displacement Reactions An atom of one compound is replaced by an atom of another element

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Types of Chemical Reactions 4. Double Displacement Reactions Elements from two different compounds displace each other to form two new compounds

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Net Ionic Equations Because reactions such as displacements often involve ions in a solution, they can be written in ionic form Very important to demonstrate the actual reaction occurring

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Balancing Equations From the law of conservation of mass, the mass of the reactants in a reaction must be equal to the mass of the products Stoichiometry is essentially the study of how the quantities of reactants and products are related in a chemical reaction.

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Examples of balancing

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Applications of stoichiometry

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Limiting Reactants Limiting reactant limits the amounts of product that can be formed in the reaction The reactant that remains after all of the limiting reactant is used up is called the excess reactant