Rio Salado Chem 130 Final Exam Questions and Correct Answers

Endothermic Absorbs heat, requires hear for the reaction Law of Conservation of Mass Matter is not created nor destroyed in any chemical or physical change, ergo total amount of matter in reactants = total amount of matter in products Mole-mole factors a conversion factor that relates the number of moles of two compounds derived from the coefficients in an equation Limiting reactant the substance that controls the quantity of product that can form in a chemical reaction Excess reactant a reactant that remains after a chemical reaction stops Limiting reactant The one that runs out first, smaller amount of product when doing a mole-mole factoring Theoretical yield the amount of product that can be made in a chemical reaction based on the amount of limiting reactant Actual yield the measured amount of a product obtained from a reaction Joule(J) SI unit of energy Kilojoules (kj) Used to show the energy change in a reaction Heat of reaction The amount of heat absorbed or released in a reaction that takes place at constant pressure. Also called the "enthalpy of reaction" Exothermic reaction (exo means out) Energy of the products is lower than that of the reactants. Heat in product Endothermic reaction (endo means within) Energy of the products is higher than that of the reactants heat in reactants Double bond A chemical bond formed when atoms share two pairs of electrons Triple bound A chemical bond formed when atoms share three pairs of electrons Atoms most likely to form triple bounds Carbon, oxygen, nitrogen, and sulfur Atoms that do not form double or triple bounds Hydrogen and halogens