General Chemistry for Engineers - CHEN 1201

Flashcards covering key concepts from the General Chemistry for Engineers lecture notes, focusing on energy, heat, work, and specific heat.

What are the two main forms of energy discussed in the lecture?

Energy and Heat/Work.

What happens to the system's energy when q = 0?

The system's energy stays the same.

How is heat (q) defined?

Heat (q) is the exchange of thermal energy.

What is thermal equilibrium?

Thermal equilibrium is when the system and surroundings are at the same temperature (T), resulting in q = 0.

What does the equation q = CΔT represent?

The relationship between heat transferred and temperature change, where C is the heat capacity.

What is the difference between specific heat capacity (Cs) and molar heat capacity (Cm)?

Cs is intensive and defined as q = m Cs ΔT; Cm is extensive, defined as q = n Cm ΔT.

In a thermal contact scenario, which substance undergoes a larger change in temperature when mass A is twice that of B and specific heat capacity of B is four times that of A?

Substance A will undergo the larger change in temperature (ΔT).

How do you calculate work done by a chemical reaction with changing volume?

Work is calculated as the product of change in volume and external pressure.

When two identical gas systems are heated, which undergoes the largest change in internal energy?

The system that is at constant pressure will undergo the largest change in internal energy.

What is the change in energy (ΔE) for the volume expansion of fuel in a cylinder when 875 J is emitted as heat?

ΔE is calculated by considering the work done during expansion and heat emitted.