During an energy exchange, a chemical system absorbs energy from ...

Question

During an energy exchange, a chemical system absorbs energy from its surroundings. What is the sign of ΔEsys for this process?

Accepted Answer

Identify the type of process: The problem states that the chemical system absorbs energy from its surroundings, which indicates an endothermic process.. Understand the concept of energy exchange: In an endothermic process, energy is absorbed by the system, meaning the system gains energy.. Determine the sign of $ \Delta E_{\text{sys}} $: Since the system is gaining energy, the change in energy of the system ($ \Delta E_{\text{sys}} $) is positive.. Relate to the first law of thermodynamics: The first law states that energy cannot be created or destroyed, only transferred. Here, energy is transferred into the system, increasing its internal energy.. Conclude the sign of $ \Delta E_{\text{sys}} $: Therefore, the sign of $ \Delta E_{\text{sys}} $ is positive, indicating an increase in the system's energy.

During an energy exchange, a chemical system absorbs energy from its surroundings. What is the sign of ΔEsys for this process?

Key Concepts

Energy Exchange

Internal Energy (ΔEsys)

Sign Convention in Thermodynamics