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CHEM 110, Week 5 Notes

by: BritneyMoore

CHEM 110, Week 5 Notes CHEM 110

CSU Pomona

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About this Document

These notes cover the law of conservation of mass, the steps to balance a chemical equation, the 5 types of chemical reactions, Avogadro's number, and molar mass.
Chemical Principles I
Dr. Hoda Mirafzal
Class Notes
General Chemistry
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This 3 page Class Notes was uploaded by BritneyMoore on Tuesday April 26, 2016. The Class Notes belongs to CHEM 110 at California State Polytechnic University taught by Dr. Hoda Mirafzal in Spring 2016. Since its upload, it has received 10 views. For similar materials see Chemical Principles I in Chemistry at California State Polytechnic University.


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Date Created: 04/26/16
CHEM 110 04/26/2016 ▯ Chemical Reactions:  Physical Changes o Melting o Boiling o Condensation o No change occurs in the identity of the substance  Chemical Changes o Atoms in the reactants are rearranged to form one or more different substances o Old bonds are broken and new bonds are formed o A Process in which at least one new substance is produced as a result of a chemical change o Cannot create or destroy new elements  Writing a Chemical Equation o Chemical symbols give a “before and after” picture of a chemical reaction o MgO+C  CO+Mg ▯ Law of Conservation of Mass  Matter is not created nor destroyed in a chemical reaction H2+Cl2 2HCl Total Atoms: 2 H, 2Cl Total Atoms: 2 H, 2Cl Total Mass: 2 (1)+2(35.5)=73 g Total Mass: 2(36.5)= 73 g ▯ Steps in Balancing an Equation  Balance all atoms except O and elements (begin with metals)  Balance O  Balance elements  The final balanced reaction should not have fraction in the coefficients ▯ Types of Chemical Reactions  Combination  Decomposition  Single Replacement  Double Replacement  Combustion ▯ Combination (synthesis)  Two or more elements or simple compounds combine to form one product  A+B AB ▯ Decomposition  One substance is broken down into 2 or more simpler substances  AB  A+B ▯ Single Replacement  One element or ion takes the place of another element or ion in a reacting compound  A+BC  AB+C ▯ Double Replacement  Two elements or ions in reactants switch places  AB+CD  AC+BD ▯ Combustion  A reaction in which a compounds (often carbon) reacts with oxygen producing heat  A+O 2  AO 2 ▯ A Mole of Particles  Contains 6.02 x 10^23 particles = Avogadro’s Number  1 mol of Carbon = 6.02 x 10^23 Carbon atoms  1 mol NaCl= 6.02 x 10^23 Na+ ions & 6.02 x 10^23 Cl- ions ▯ Avogadro’s Number  6.02 x 10^23 particles / 1 mol  1 mol / 6.02 x 10^23 particles ▯ Molar Mass  Number of grams in 1 mol of a substance  Equal to the numerical value of the atomic mass  6.02 X 10^23 atoms  Ex: 1 mol C atoms= 12 g ▯ Molar Mass of Compounds  The mass of 1 mol of the compound  Calculate by adding the masses of all atoms in the compound  Ex: molar mass of CaCl2 o 1 mol Ca X 40.1 g/mol o + 2 mol Cl X 35.5 g/mol o CaCl2=111.1 g/mol =111.1 amu/molecule o Every 1 mol (6.02 X 10^23) molecule of CaCl2 has a mass of 111.1 g ▯


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