General Chemistry 221 Exam #2 Questions With 100% Verified Answers

Mole - Correct Answers a counting unit in with there are 6.022x1023 of any particle Molar Mass - Correct Answers the mass of 1 mole of particles (g) Soluable - Correct Answers description of matter's ability to disperse in a solvent (usually water), (aq) Net Ionic Equation - Correct Answers Equation representing the chemical changes made in a reaction Empirical Formula - Correct Answers Formula containing the smallest ratio of atoms in a compound Disassociation - Correct Answers the breaking up of ions in an ionic compound in water Molar Ratios - Correct Answers the ratio of atoms/ions in a compound. It is used in unit conversion Weak Acid - Correct Answers An acid that dissociates less than 100% in water Theoretical Yield - Correct Answers the mass of chemical based on stoichiometry using the amount of reactants Titrate - Correct Answers chemical that is in the buret during a titration When barium nitrate & lithium sulfate are mixed, the net ionic equation for the precipitation of barium sulfate is Ba+2(aq) + S-2 (aq) + 4O-2 (aq) → BaSO4(s). T/F - Correct Answers False Hydrochloric acid is a strong electrolyte. T/F - Correct AnswersTrue The titrant is in the buret of a titration. T/F - Correct AnswersTrue To have [CaCl2]=0.6312 M, 28.00 g CaCl2 is dissolved in 400.0 mL of water. T/F - Correct AnswersTrue Molar mass and atomic weight are the same number on the periodic table with different units. T/F - Correct Answers True The number of molecules in 1 mole of NO2 is 1.8 x 1024. T/F - Correct Answers False What is the difference between a strong electrolyte, weak electrolyte, and nonelectrolyte? - Correct Answers strong electrolytes 100% dissociate in water. Weak electrolytes dissociate, but less than 100% in water. Nonelectrolytes do NOT dissociate in water. Compare the dissociation of a weak acid and a strong acid. - Correct Answers Strong acid molecules do not exist in water and their reactions will have a single facing arrow -. Weak acids have molecules and ions in solution and will have the double facing arrow -. Both will have the H3O+1 ion in their reactions, and NOT H+1.