Two solid objects, A and B, are both at room temperature and then placed in boiling water. The objects are left in the boiling water for 10 minutes, ensuring they are heated up to the same temperature as the boiling water. Each is then lifted out and placed in separate beakers containing 1000 g of water at 10.0°C. Object A increases the water temperature by 1.50 °C; object B increases the water temperature by 7.20 °C. In neither case does a chemical reaction occur. Which of the following must be true? O The masses of objects A and B are equal. O The heat capacities of objects A and B are equal. The heat capacity of object B is less than the heat capacity of object A. O The heat capacity of object B is greater than the heat capacity of object A.
Two solid objects, A and B, are both at room temperature and then placed in boiling water. The objects are left in the boiling water for 10 minutes, ensuring they are heated up to the same temperature as the boiling water. Each is then lifted out and placed in separate beakers containing 1000 g of water at 10.0°C. Object A increases the water temperature by 1.50 °C; object B increases the water temperature by 7.20 °C. In neither case does a chemical reaction occur. Which of the following must be true? O The masses of objects A and B are equal. O The heat capacities of objects A and B are equal. The heat capacity of object B is less than the heat capacity of object A. O The heat capacity of object B is greater than the heat capacity of object A.
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter4: Energy And Chemical Reactions
Section: Chapter Questions
Problem 120QRT
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Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Question
Transcribed Image Text:Two solid objects, A and B, are both at room temperature and then placed in boiling water. The objects are
left in the boiling water for 10 minutes, ensuring they are heated up to the same temperature as the boiling
water. Each is then lifted out and placed in separate beakers containing 1000 g of water at 10.0°C. Object A
increases the water temperature by 1.50°C; object B increases the water temperature by 7.20 °C. In neither
case does a chemical reaction occur.
Which of the following must be true?
O The masses of objects A and Bare equal.
O The heat capacities of objects A and B are equal.
O The heat capacity of object B is less than the heat capacity of object A.
O The heat capacity of object B is greater than the heat capacity of object A.
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