Cumulative Exam Review Questions and Answers Graded A+

Cumulative Exam Review Questions and Answers Graded A+ What explains the effect observed when gas molecules move at a slower rate? The temperature drops because the average kinetic energy diminishes. The volume of the gas increases. The pressure of the gas remains constant. The density of the gas increases. Which salt forms when ammonium hydroxide reacts with nitric acid? Ammonium nitrate (NH4NO3). Ammonium sulfate (NH4)2SO4. Ammonium chloride (NH4Cl). Ammonium carbonate (NH4)2CO3. What does it indicate if a substance turns methyl orange solution red? The substance is acidic. The substance is neutral. The substance is basic. 2 The substance is a salt. What is the definition of activation energy? The minimum energy required for reactants to undergo a chemical change. The energy released during a reaction. The energy required to break bonds. The energy needed to form bonds. Which device is best suited for measuring the caloric content of food, such as a bag of chips? Bomb calorimeter. Simple thermometer. pH meter. Refractometer. Which equation illustrates a double replacement reaction? Na2CO3(aq) + CaCl2(aq) > 2NaCl(aq) + CaCO3(s). HCl(aq) + NaOH(aq) > NaCl(aq) + H2O(l). Fe2O3(s) + 3H2(g) > 2Fe(s) + 3H2O(g). 3 CH4(g) + 2O2(g) > CO2(g) + 2H2O(g). For the reaction: 3O2(g) <> 2O3(g), given equilibrium concentrations of O2 and O3 at 298 K, what is the equilibrium constant? 2.0 x 10−50. 3.0 x 10−28. 1.5 x 10−49. 2.5 x 10−52. Which feature best identifies a substance as an Arrhenius base? It produces hydroxide ions when dissolved in water. It forms hydrogen ions in water. It reacts with acids to produce salts. It neutralizes acids. What term describes the creation of ions during a chemical reaction? Ionization. Dissociation. 4 Protonation.