198
When
chemicals
react
together
the
reactants
produce
products.
We
may
see
if
a
chemical
reaction
has
occurred
because
there
may
be
a
colour
change,
it
may
fizz,
it
may
produce
heat,
(
or
it
may
go
colder
).
If
it
fizzes
this
means
that
it
is
giving
off
a
gas.
Gases
that
we
might
expect
to
be
produced
are
oxygen,
carbon
dioxide
or
hydrogen.
When
acids
are
added
to
a
carbonates,
carbon
dioxide
is
produced.
When
a
carbonate
is
heated,
carbon
dioxide
is
also
produced.When
a
metal
is
added
to
water
or
an
acid,
hydrogen
is
produced.
The
test
for
hydrogen
is
that
a
lighted
splint
in
hydrogen
gas
will
produce
a
squeaky
pop
-
a
little,
or
large,
explosion.
The
Hindenburg
Airship
produced
a
large
explosion
when
a
spark
set
light
to
to
hydrogen
in
the
airship.
The
test
for
carbon
dioxide
gas
is
that
it
will
turn
limewater
cloudy.
The
test
for
oxygen
gas
is
that
it
will
relight
a
glowing
splint.
If
a
gas
is
produced
in
a
reaction
it
will
escape
into
the
atmosphere,
and
the
mass
of
the
products
appears
to
go
down
-
because
some
of
the
mass
is
in
the
air!
Drag the Tiles into position to put the segments of text into the correct order.
Unscramble the text by putting the words below into the correct order in the box above.

22
"products.",8
"colour",23
"fizz,",27
"heat,",31
"colder",37
"that",44
"gas.",50
"oxygen,",60
"carbonates,",71
"heated,",80
"water",91
"acid,",94
"hydrogen",95
"squeaky",113
"explosion.",120
"spark",130
"limewater",150
"relight",161
"glowing",163
"atmosphere,",178
"mass",181
"air!",198
Fill in the gaps by typing in the missing word, or by dragging the correct word from the list below.
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