chapter 7 lesson 3. physical change a change in size, shape, form, or state of matter matter’s...
TRANSCRIPT
Physical ChangesChapter 7 Lesson 3
Physical ChangeA change in size, shape, form, or state of
matterMatter’s identity stays the sameMatter does not become something different
State of MatterMovement of particles must changeThermal energy (heat) is added or removed
Adding Thermal EnergyParticles move fasterTemperature increasesSolid to Liquid
Particles move too fast for attractive force to hold them together – reaches melting point
Liquid to GasParticles move too fast for attractive force to
hold them together – reaches boiling point
SublimationSolid changes directly into a gas without first
being a liquid Example: dry ice (frozen carbon dioxide), solid
iodine
Removing Thermal EnergyParticles slow downTemperature decreasesGas to liquid
Particles slow down enough for attractive forces to pull the particles close together – condensation
Liquid to solidParticles slow down enough for attractive
forces to pull the particles close together - freezing
Freezing and meltingReverse processesOccur at the same temperature
Boiling and condensationReverse processesOccur at the same temperature
DepositionGas changes directly into a solid without first
being a liquid Example: frost
Opposite of sublimation
DissolvingPhysical change because the identities of the
substances have not changedExample: salt water
Can be reversed by boiling
Conservation of MassMass is conserved because it remains the
same after a change, such as a physical change
The particles of matter that are present before a physical change are the same as those present after the physical change
If a sample of water has a mass of 200 g and the final solution has a mass of 230 g, how much solute dissolved in the water?