CHM 130 Test 2 Ch. 5-8 Exam Questions And Correct Answers

Atomic elements - correct answers __ __ one atom of one element Molecular elements - correct answers __ __ 2 or more atoms of the same element (Br2, I2, N2, Cl2, H2, O2, F2) Molecular compounds - correct answers __ __ nonmental + nonmental compounds (smallest unit: molecule) Ionic compounds - correct answers __ __ metal + nonmetal compounds (smallest unit: formula unit) Binary Ionic compounds - correct answers __ __ __ two elements, metal + nonmetal Ternary Ionic compounds - correct answers __ __ __ 3 elements, metal + nonmetal + nonmetal (usually oxygen) Binary molecular compounds - correct answers __ __ __ two elements, nonmetal + nonmetal Binary acid - correct answers __ __ hydrogen + nonmetal Ternary oxyacid - correct answers __ __ hydrogen + nonmetal + oxygen 6.022xa0^23 - correct answers 1 mole= Molar mass - correct answers __ __=the mass in grams of one mole of an element or compound Percent composition - correct answers __ __ the mass percent of each element within a compounds Empirical formula - correct answers __ __ the simplest, whole-number ratio of atoms in a compound Molecular formula - correct answers __ __ a multiple of the empirical formula 1. Convert the percentages to grams, skip if already grams 2. Convert grams to moles. Use molar mass of each element 3. Divide all mole values by smallest mole value - correct answers Finding an empirical formula from % composition: (3 steps) Chemical change - correct answers __ __ the chemical composition of the substance changes Chemical reaction - correct answers __ __ involve chemical changes in matter Chemical equation - correct answers __ __ describes a chemical reaction using formulas and symbols. A + B = C + D (A&B are reactants, C&D are products) Synthesis (combination) reactions - correct answers __ (__) __ two simpler substances are combined into a more complex compounds. A + Z = AZ Decomposition reactions - correct answers __ __ a single compounds is broken down into simpler substances. AZ= A + Z Single-displacement reactions - correct answers __-__ __ one metal displaces another metal in a compound. A + BZ = AZ + B The Activity Series. the activity series - correct answers __ __ __ A ranking of metals according to their ability to undergo a reaction. A metal in is elemental form can replace a metal ion that appears after it in __ __ __