Thermodynamics and Energy Concepts

What does the law of conservation of energy state in terms of physical or chemical processes?

• Energy can be created or destroyed.

• Energy is neither created nor destroyed.

• Energy is only created, not destroyed.

• Energy is only destroyed, not created.

In an endothermic process, what happens to the system in terms of heat?

• The system loses heat to the surroundings.

• The system gains heat from the surroundings.

• The system neither gains nor loses heat.

• The system gains heat and loses it simultaneously.

What is the sign of q for an exothermic process?

• Positive

• Negative

• Zero

• Undefined

What is enthalpy (H) in the context of chemical reactions?

• The pressure of a system at constant volume.

• The volume of a system at constant pressure.

• The heat content of a system at constant pressure.

• The mass of a system at constant temperature.

What symbol is used interchangeably with q in chemical reactions?

• ΔT

• ΔP

• ΔV

• ΔH