Enthalpy

Front

What is Enthalpy (ΔH)?

Back

Enthalpy (ΔH) is a measure of the total heat content of a system, reflecting the internal energy plus the product of pressure and volume.

Front

What does a positive ΔH indicate?

Back

A positive ΔH indicates that a reaction is endothermic, meaning it absorbs heat from the surroundings.

Front

What does a negative ΔH indicate?

Back

A negative ΔH indicates that a reaction is exothermic, meaning it releases heat to the surroundings.

Front

Define Endothermic Reaction.

Back

An endothermic reaction is a chemical reaction that absorbs heat, resulting in a decrease in temperature of the surroundings.

Front

Define Exothermic Reaction.

Back

An exothermic reaction is a chemical reaction that releases heat, resulting in an increase in temperature of the surroundings.

Front

What is the relationship between enthalpy change and reaction type?

Back

The sign of the enthalpy change (ΔH) indicates the type of reaction: positive for endothermic and negative for exothermic.

Front

How do endothermic reactions feel to the touch?

Back

Endothermic reactions feel cold to the touch because they absorb heat from the surroundings.

Front

How do exothermic reactions feel to the touch?

Back

Exothermic reactions feel warm to the touch because they release heat into the surroundings.

Front

What is a potential energy diagram?

Back

A potential energy diagram visually represents the energy changes during a chemical reaction, showing the energy of reactants, products, and the activation energy.

Front

What does the peak of a potential energy diagram represent?

Back

The peak of a potential energy diagram represents the transition state or activated complex, where the energy is at its maximum during the reaction.