Popular in Principles of Chemistry I
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This 3 page Class Notes was uploaded by Brianna Carmony on Monday February 22, 2016. The Class Notes belongs to Chem 1301-2 at Baylor University taught by John Olson in Winter 2016. Since its upload, it has received 18 views. For similar materials see Principles of Chemistry I in Chemistry at Baylor University.
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Date Created: 02/22/16
Monday, February 22, y Chemistry Test three notes 4a+4b=2d+e+f 2a,3b,6d,2c,10f,2e 2b=2e+f 2b=d 2a= 3cf 3a=2b 3c=d • one atom is oxidized and one atom is reduced • Cr2O72+ Cl—> Cr+3+ Cl2 (acidic) • write basic or acidic Cl oxidized by 1. Cr reduced by 3 Fe oxidized by 1. Cr reduced by 3 C oxidized by 1. Mn reduced by 5 I oxidized by 2/3. I reduced by 16/3 I oxidized by 2/3. O reduced by 2 Sn oxidized by 2. Bi reduced by 3 1 Monday, February 22, y Cr oxidized by 3. Br reduced by 6 Cr oxidized by 3 and I oxidized by 8. Cl reduced by 1 Zn oxidized by 2. N reduced by 4 I oxidized by 1. Cr reduced by 4 • Oxidation-reduction (redox) reactions are reactions that involve a transfer of electrons between components in the reaction. • The components that supply the electrons in the transfer are referred to as the oxidation reaction and the components that accept the electrons in the transfer are referred to as the reduction reaction. • The oxidation and reduction reactions are called half- reactions. - Stoichiometry has three features for problems that are common have a balanced chemical reaction - - have information about amounts of reactants or products - have onjectives involving predictions of amounts of reactants or products •The common technique for balancing redox reactions is to separate the reaction into two reactions, the oxidation reaction and the reduction reaction.The atom balance is a consequence of Dalton’s Theory which states that atoms can not be created or destroyed. Therefore, for every element present in the reaction, the number of atoms for that element must be the same on both sides of the reaction. This is the first condition, the Atom Balance Condition (AB), and can be expressed as, for each element present in the chemical reaction, where both sides of this equation refer to the same element. It is also easy to see that the total number of equations of this type generated by this condition is equal to the number of elements present in the reaction. For example, 2 Monday, February 22, y gives for O but for H so that this is not balanced. However it is easy to see that the following reaction is balanced. More generally, if X is an element in the reaction below and A, B, C and D represent the rest of the chemical formulas the atom balance condition for X would be . Notice that each term in this equation is just the number of atoms of X in the compound times the unknown integer. One should also notice how simple it is to obtain an atom balance equation for each element present in the reaction. 3
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