Cumulative Exam Review Questions with Complete Solutions

1 Cumulative Exam Review Questions with Complete Solutions Which type of energy change occurs as gasoline evaporates from a container? - Energy is emitted. - Energy is absorbed. - Energy remains unchanged. - Energy undergoes conversion. Energy is absorbed. --- A student describes the following about mass defect and nuclear binding energy: 1. Combining an isotope’s protons and neutrons into a nucleus converts a small portion of mass into energy. 2. To separate the nucleus back into protons and neutrons, an equal amount of energy is required. 2 3. The first point describes the isotope’s binding energy, while the second describes its mass defect. Which statements are accurate? - Only the first statement is correct. - Only the second statement is correct. - Both the first and second statements are correct. - All three statements are correct. Both the first and second statements are correct. --- What reaction type is represented here? - Addition - Condensation 3 - Elimination - Substitution Substitution --- Given potassium-40 (K-40) with 19 protons and 21 neutrons, which symbol represents an isotope resulting from its decay? - Symbol 1 - Symbol 2 - Symbol 3 - Symbol 4 Symbol 2 --- 4 For reactant P with 50 J of energy and reactant Q with 35.3 J, resulting in product PQ with 104 J, what type of energy change occurs? - Energy is absorbed as the product has more energy. - Energy is absorbed as the product has less energy. - Energy is lost as the product has more energy. - Energy is lost as the product has less energy. Energy is absorbed as the product has more energy. --- When 0.750 g of octane (C8H18) burns in a calorimeter, raising the temperature from 21.0°C to 41.0°C, and the calorimeter’s specific heat is 1.50 J/(g • °C) with a mass of 1.00 kg, how much heat is released? - 22.5 kJ - 30.0 kJ 5 - 31.5 kJ - 61.5 kJ 30.0 kJ --- Which substance primarily consists of saturated hydrocarbons? - Vegetable oil - Alcohol - Gasoline - Salt crystals Gasoline --- 6 Which characteristic is typical of a carbon atom? - Carbon has a high melting point. - Carbon dissolves readily in water. - Carbon forms single, double, and triple bonds. - Carbon is among the rarest elements in the universe. Carbon forms single, double, and triple bonds. What is the value of n in CH3(CH2)nCH3 if the name of the hydrocarbon is heptane? 2 5 7 8 5 What is a characteristic of branched chained alkanes? They have one or more rings of carbon atoms. They have carbon atoms that are double-bonded to other carbon atoms. 7 They have more than two carbons that are bonded to only one other carbon. They have carbons bonded in a single row from one end of the molecule to the other end of the