phase, physical, chemical and energy changes Flashcards
Chemical change
-change in which new substances are
formed
-produces a set of chemicals which is DIFFERENT
from the set of chemicals which existed before the
change
-not reversible
Physical change
-change in PHASE of a substance, no
new substances are formed
-does not change the set of chemicals involved
-a reversible change
Melting point
when a solid changes to a liquid
Freezing
when a liquid changes to a solid
• at melting/freezing temp the
• solid and liquid phases co‐exist
Boiling
points at which a liquid changes into gas
Condensation
gas changes into liquid
• at boiling/condensing temp the liquid and gas phase
co‐exist
does the temperature change in a phase change?
no
which has more heat, a physical or chemical change?
chemical change has much more
Kinetic energy
The energy that molecules possess as
a result of their motion
name all types of kinetic energy (do not explain)
translational, rotational, vibrational
Rotational energy
Causes a molecule to rotate around one of its axes: x, y, z
Vibrational energy
Changes the bond lengths and/or angles between
atoms in a molecule
Translational energy
Causes the molecule to travel in a straight line from
place to place, but has no effect on bond lengths and
angles
cation
positive ions
anion
negative ions
extensive properties
depends on the amounts of the substance
present
intensive properties
depends solely on the nature of the
compound, not how much is present
