Journal Entry:

The sample of water requires the greatest input of energy during
(A) the melting of ice at 0 ^oC
(B) the heating of water from 0 ^oC to 100 ^oC
(C) the vaporization of water at 100 ^oC
(D) the heating of steam from 100 ^oC to 250 ^oC

Learning Intentions

• We will learn how to calculate enthalpy of heating or cooling processes and what constants to use in different stages of the process.

Closing Task:

You can solve enthalpy of phase change problems.

Content Standards being covered:

Chemical system undergo three main processes that change their energy: heating/cooling, phase transitions, and chemical reactions. (E.K. 5.B.3.)

Explain changes in the heat (q) absorbed or relased by a system undergoing a phase transition based on the amount of th esubstance in moles ande the molar enthalpy of the phase transtiion. (ENE-2.E)