EXPERIMENT 1 Molar Enthalpy of Fusion for Ice

Vocabulary flashcards covering key concepts, terms, and equations related to the molar enthalpy of fusion, heating curves, and related thermochemistry from Experiment 1.

Molar enthalpy of fusion

The amount of heat required to convert one mole of a solid (ice) into a liquid (water) at the substance's melting point, under constant pressure.

Enthalpy of fusion

The heat needed to melt one mole of a substance from solid to liquid at its melting point.

Heating curve

A graph of temperature versus time that shows how a substance heats and undergoes phase transitions.

Phase transition

A change of a substance from one phase to another (solid ↔ liquid, liquid ↔ gas) that often involves heat transfer.

Specific heat

The amount of heat required to raise the temperature of 1 g of a substance by 1 °C (units: J g^-1 °C^-1).

2.09

Specific heat of ice

4.184

Specific heat of liquid water

2.0

Specific heat of steam

∆H_fus

Molar enthalpy of fusion (heat required to melt one mole of a substance).

∆H_vap

Molar enthalpy of vaporization (heat required to vaporize one mole of a substance).

Calorimeter

A device (e.g., coffee cup calorimeter made of Styrofoam) used to measure heat transfer during a chemical process.

Ice-to-water melting

Phase transition from solid to liquid; requires energy input at a constant temperature.

Plateau (on a heating curve)

Flat region indicating a phase transition where temperature remains constant while heat is absorbed or released.

Molar enthalpy of fusion for ice

A constant value at the melting point for ice, used to compare energy requirements per mole across substances.

Molar mass of water

18.02 g per mole of H₂O.

Vaporization enthalpy of water at 100 °C

44.0 kJ mol^-1; the heat required to vaporize one mole of water at 100 °C.