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chem test 4_ stoichiometry%2Fcalculations .pdf

Conversion factor example an unknown compound is made

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- Conversion factor - Example: An unknown compound is made up of 2.8 g of N and 6.4 gO - N= 1 mol N/ 12gN x 2.8gN= .2 moles of N atoms - O= 1 MOL O/ 16gO x 6.4gN= .4 of O atoms - Always put it over the lowest number - So, .2/.2 : .4/.2 - N:O = 1:2 Conservation of mass - Amount of matter stays the same: matter cannot be created or destroyed - The total matter on one side of the equation equals the total matter on the other side of the equation Conservation of energy - Energy may be changed from one form to another but can never be created nor destroyed - Energy on one side of the equation equals energy on the other side of the equation Conservation of charge - The # of positive and negative charges on one side of the equation equals the # of positive and negative charges on the other side of the equation Type of chemical reactions: - Synthesis Reaction:Two or more elements or simpler compounds unite to form a compound - Decomposition Reaction: A compound is broken down into 2 or more elements or simpler compounds - Single Replacement Reaction: A free element replaces an element that is part of a compound - Double Replacement Reaction: Two elements replace each other, switch partners
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