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Changes of State

editted version of Jerry Wilson's presentation
by

Jane Wilson

on 28 February 2013

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Transcript of Changes of State

When a substance is heated
or cooled, it can change from
one state to another. Changing State Melting is a change of
state from solid to liquid. Crystalline solids melt at a
certain temperature called
the melting point. The melting
point of ice is 0 C. Amorphous solids do not
have a melting point. They
just keep getting softer as
the temperature rises, like
glass. Glass is an amorphous
solid. As it is heated it
gets softer and softer.
Glass has no melting point. melting freezing When heat is removed from
a liquid its molecules start
moving more slowly until it
becomes a solid. This is
called freezing. Freezing is the opposite
of melting. The freezing
point of a liquid is the
same as the melting point
of its solid. The freezing
point of water is 0 C. During freezing or melting
the temperature of the
substance does not change. vaporization
&
condensation Vaporization is changing state
from a liquid to a gas. There
are two types of vaporization:
Evaporation
Boiling Boiling happens when a liquid
changes to a gas beneath the
surface of the liquid. As a liquid
increases in temperature, its
molecules move faster until they
form gas bubbles under the surface. Boiling takes place at
a certain temperature
called the boiling point.
For water, the boiling
point is 100 C. Evaporation is changing
from liquid to gas at the
surface of a liquid. It can
happen at any temperature.
It explains why mud puddles
dry up. Condensation is the opposite
of vaporization. It is changing
from gas to a liquid. When a
gas cools down or touches a
cool surface, it changes to a
liquid. This explains dew or
why the outside of a cold glass
of water gets wet. Some solids change directly
to a gas without going through
the liquid state. This is called
sublimation. Dry ice, which is
solid carbon dioxide, turns
directly back to a gas. The
opposite of sublimation is
deposition, where a gas is
turned directly to a solid, such
as in the formation of snowflakes. Dry Ice causes water to immediately freeze. Let's Review Snowflakes are 6-sided
crystals caused by water
vapor turning into a solid.
Full transcript