Chem 115 1nd EditionExam # 1 Study Guide Lectures: 7-14Lecture 7 (January 27)Know how to do mass percentages and percentages of an element in a compoundKnow how to find the empirical formulaLecture 8 (January 29)What is a chemical equation reaction?Uses formulas to express identities and quantities of substances in a physical/chemical changeKnow how to balance reactionsKnow how to use stoichiometryLecture 9 (January 31)What is a limiting reactant?Limits the amount of product that can formIf not limiting, what is the other reactant?ExcessWhat is the difference between a theoretical yield versus an actual yield?A theoretical yield is the amount calculated using molar ratios while actual yield is the amount obtainedLecture 10 (February 5)What is a solvent?Solution that consists of 1 or more dissolved solutesWhat is concentration?Given by quantity of solute present in given quantity of solutionWhat do you use M for?ConcentrationsLecture 11 (February 7)What are properties of water being a solvent?- Polar- Ions dissociate- Become aqueous- Ions give water energyLecture 12 (February 10)What are molecular equations, total ionic equations, and net equations?Molecularshows all parts of a reactionTotal Ionicshows soluble ionic substances dissociated into ionsNetsimplest form of the total ionic Know solubility rulesLecture 13 (February 12)Know strong acids, weak acids, strong bases, and weak basesLecture 14 (February 14)Know how to do redox reactionsLossElectronsOxidize GainElectronsReduceLecture 14 (February 17)Know how to balance redox
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