Changes of State - heat of fusion ( H fus ) Ice H fus =...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Changes of State The three states of matter include solid liquid gas In general, matter in one state can be changed into either of the other two states. Such transformations are called "phase changes" Energy Changes Accompanying Changes of State Each change of state is accompanied by a change in the energy of the system Whenever the change involves the disruption of intermolecular forces, energy must be supplied The disruption of intermolecular forces accompanies the state going towards a less ordered state
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
As the strengths of the intermolecular forces increase, greater amounts of energy are required to overcome them during a change in state The melting process for a solid is also referred to as fusion The enthalpy change associated with melting a solid is often called the
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: heat of fusion ( H fus ) Ice H fus = 6.01 kJ/mol The heat needed for the vaporization of a liquid is called the heat of vaporization ( H vap ) Water H vap = 40.67 kJ/mol Less energy is needed to allow molecules to move past each other than to separate them totally Vaporization requires the input of heat energy. Our bodies use this as a mechanism to remove excess heat from ourselves. We sweat, and its evaporation requires heat input (the excess heat from ourselves). Refrigerators use the evaporation of Freon (CCl 2 F 2 ) to remove heat inside the fridge. The Freon is condensed outside the cabinet (usually in coils at the back) in a process which releases heat energy (the coils will be warm)...
View Full Document

This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

Page1 / 3

Changes of State - heat of fusion ( H fus ) Ice H fus =...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online