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

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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.

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