
Interpretation: The positive and negative sign of the energy needs to be explained.
Concept Introduction: In an exothermic reaction, energy discharges from the system while in endothermic reaction, energy is consumed from the surrounding. The internal energy E of a system is altered by a work flow and heat or both.

Answer to Problem 15A
If the energy is denoted by a positive sign, then the process is endothermic and if energy is denoted by a negative sign, the process is exothermic.
Explanation of Solution
If a quantity of energy passes into the system via heat, q (heat), it is equal to +x. Here, increase in system’s energy is denoted by the positive sign. On the other hand, when energy flows out of the system via heat, q, it is equal to −x. The decrease in system’s energy is denoted by negative symbol.
The ability to do work is termed as energy. Energy is conserved.
Chapter 10 Solutions
World of Chemistry, 3rd edition
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