1.2水的三态变化（1）（课件 16PPT 双语教学）

(共16张PPT)
1.2
States
of
Water
1.2.1-Melting
and
Condensation
What’s
your
favorite
weather
rain
snow
sunny
Why
you
like
it
The
state
of
water
is
related
to
temperature
Melting:熔化
Condensation：凝固
Experiment
Experimental
Time
Experimental
Record
Trail
Purpose
Principle
Trial
materials
Trial
procedure
Trial
Data
and
Processing
T
of
mixture
Melting
of
ice
Experiment
Trail
Purpose
to
prove
that
process
of
melting
is
exothermic.
Principle
Melting
is
exothermic.
Trial
materials
breaker,
ice
cube,
thermometer
and
some
warm
water.
Trial
procedure
Describe
the
experiment
in
English
Trial
Data
and
Processing
Phenomenon(thermometer,
ice
cube
and
warm
water)
Trial
Results
Give
an
explanation
of
melting
and
compare
it
with
condensation
Melting
Solid
to
a
Liquid
吸热
Endothermic
Melting
is
an
exothermic(吸热)
process
The
temperature
that
substances
begin
to
melt
is
called
melting
point
The
temperature
of
the
mixture
of
ice
and
water
is
constant.
The
melting
point
of
water
is
constant
Crystals
possess
fixed
melting
point
T:℃
T:min
Crystal‘s
feature
Condensation
Liquid
to
Solid
放热
Exothermic
condensation
is
an
exothermic(放热)
process
The
temperature
that
substances
begin
to
condensate
is
called
freezing
point
T:℃
T:min
T:℃
T:min
T:℃
T:min
Melting
Endothermic
Condensation
Exothermic