Completar Frases
2026 Final Exam Science Review
The
mass
of
a
(
n
)
is
so
small
that
it
doesn't
really
change
the
mass
of
an
atom
.
When
uranium
-
238
decays
into
lead
-
206
,
the
difference
between
the
mass
of
uranium
and
lead
is
amu
,
while
the
difference
between
their
atomic
numbers
is
.
A
(
n
)
particle
is
released
when
radium
decays
into
radon
,
while
a
(
n
)
particle
is
released
when
changing
a
neutron
into
a
proton
when
lead
decays
into
bismuth
.
is
always
released
during
any
type
of
radioactive
decay
.
metals
react
violently
with
water
.
metals
tend
to
be
less
reactive
than
the
families
to
the
left
and
right
of
them
.
Metalloids
have
properties
of
metals
and
nonmetals
.
The
element
in
group
18
,
period
4
is
and
it
would
be
a
at
room
temperature
and
would
react
with
other
elements
.
Ionic
compounds
that
dissolve
in
water
conduct
electricity
because
they
break
into
that
move
freely
.
The
properties
of
solid
metals
can
be
explained
by
the
of
and
the
bonding
among
the
metal
atoms
.
is
so
unique
that
it
could
easily
be
placed
in
either
group
1
or
group
17
.
Orderly
crystal
shapes
,
high
melting
points
,
and
electrical
conductivity
when
dissolved
in
water
are
properties
of
compounds
.
When
electrons
are
between
two
atoms
,
a
covalent
bond
is
formed
.
A
low
melting
point
is
one
property
of
compounds
.
A
nonpolar
bond
is
formed
when
two
atoms
share
electrons
.
The
overall
charge
on
an
atom
is
;
the
overall
charge
on
a
compound
is
.
When
an
atom
loses
an
electron
,
it
becomes
a
(
n
)
positively
charged
.
A
bond
is
when
two
pairs
of
electrons
are
shared
between
two
atoms
.
Aluminum
foil
is
an
example
of
a
metal
that
is
.
A
chemical
bond
formed
when
two
atoms
share
electrons
is
called
a
(
n
)
.
Electrons
involved
in
bonding
between
atoms
are
electrons
located
from
the
nucleus
in
the
and
sublevels
that
have
a
charge
.
Molecular
compounds
that
dissolve
in
water
do
not
conduct
electricity
because
no
are
present
.
In
the
chemical
formula
for
an
ionic
compound
,
the
name
of
the
is
written
first
.
A
mixture
made
up
of
two
or
more
elements
,
at
least
one
of
which
is
a
metal
is
called
a
(
n
)
.
Fluorine
is
a
(
n
)
molecule
because
the
valence
electrons
are
shared
equally
between
the
two
fluorine
atoms
.
Ions
that
are
made
of
more
than
one
type
of
atom
are
examples
of
An
ionic
bond
is
the
attraction
between
charged
ions
.
A
metal
crystal
consists
of
positively
charged
metal
ions
embedded
in
a
sea
of
freely
moving
.
atom
(
s
)
of
a
halogen
would
need
to
react
with
one
atom
of
an
alkaline
earth
metal
to
be
stable
.
Calcium
phosphate
is
an
ionic
compound
with
the
chemical
formula
Ca3
(
PO4
)
2
.
The
subscript
3
tells
the
number
of
ions
present
,
the
subscript
4
tells
you
the
number
of
ions
present
,
and
the
subscript
2
tells
you
the
number
of
ions
present
.
The
subscript
of
the
phosphorus
ion
present
is
.
Because
the
electrons
in
a
molecule
of
dihydrogen
sulfide
are
more
strongly
pulled
toward
the
sulfide
atom
,
the
molecule
is
.
The
most
reactive
metals
are
the
metals
.
Solid
are
good
conductors
of
thermal
energy
and
electrical
current
.
Most
molecular
compounds
have
melting
points
and
boiling
points
.
A
metal
crystal
consists
of
metal
surrounded
by
When
cations
form
bonds
with
anions
,
the
charge
on
the
resulting
compound
is
.
Ionic
compounds
are
electrically
.
In
order
to
determine
the
charge
on
a
metal
from
groups
3
-
16
,
you
must
the
criss
-
cross
and
know
the
charge
of
the
nonmetal
or
metalloid
.
List
the
elements
in
the
group
containing
the
least
reactive
nonmetals
from
largest
radius
to
smallest
radius
.
Use
their
symbols
with
a
comma
and
space
in
between
each
element
.
,
,
,
,
,
,
Compounds
can
have
a
of
bond
types
.
Aluminum
chlorite
=
(
)
3
Iron
(
III
)
oxalate
=
(
)
3
Manganese
(
II
)
phosphate
=
(
)
2
Hexabromine
undecafluoride
=
Lead
(
VI
)
acetate
=
(
)
6
Calcium
pyrophosphate
=
(
)
All
chemical
reactions
are
accompanied
by
in
energy
and
form
substances
with
new
.
In
an
endothermic
reaction
,
more
energy
is
than
is
.
In
an
exothermic
reaction
,
more
energy
is
than
is
.
The
substances
formed
during
a
chemical
reaction
are
called
,
while
substances
that
are
undergoing
a
chemical
change
are
called
.
In
a
(
n
)
reaction
,
the
products
have
less
energy
than
the
reactants
.
The
substances
that
are
having
their
bonds
rearranged
are
the
in
the
reaction
.
The
ability
for
methane
to
react
with
oxygen
is
a
property
.
Another
name
for
a
chemical
change
is
a
chemical
.
In
a
physical
change
,
some
of
the
physical
properties
may
be
altered
and
the
chemical
composition
Is
this
a
physical
or
chemical
change
:
boiling
water
Is
this
a
physical
or
chemical
change
:
iron
replaces
copper
in
copper
(
II
)
chloride
Is
this
a
physical
or
chemical
change
:
sodium
chloride
dissolves
in
water
Is
this
a
physical
or
chemical
change
:
2
colorless
liquids
make
a
yellow
precipitate
Is
this
a
physical
or
chemical
change
:
mirror
broken
Is
this
a
physical
or
chemical
change
:
copper
wire
is
melted
Is
this
a
physical
or
chemical
change
:
hair
growing
on
a
rabbit
Is
this
a
physical
or
chemical
change
:
cold
pack
reacts
and
becomes
colder
In
a
balanced
chemical
equation
,
are
.
When
the
equation
Al
+
Br2
?
AlBr3
is
balanced
,
the
coefficient
for
Al
is
.
The
reaction
in
which
hydrogen
gas
and
oxygen
gas
are
produced
by
running
an
electric
current
through
water
is
an
example
of
.
A
reaction
that
has
two
compounds
as
reactants
and
two
compounds
as
products
is
most
likely
.
A
number
written
in
front
of
a
chemical
formula
to
show
the
actual
number
of
atoms
or
molecules
is
a
(
n
)
.
The
production
of
carbon
dioxide
gas
during
the
burning
of
a
fuel
is
an
example
of
a
(
n
)
reaction
.
In
a
chemical
equation
,
the
arrow
is
read
as
.
In
a
balanced
chemical
equation
for
the
formation
of
ammonia
(
NH3
)
from
nitrogen
gas
(
N2
)
and
hydrogen
gas
(
H2
)
,
the
sum
of
the
coefficients
is
.
The
principle
that
states
that
matter
is
neither
created
nor
destroyed
during
a
chemical
reaction
is
called
the
Law
of
.
The
formation
of
a
yellow
in
the
reaction
between
silver
nitrate
and
potassium
iodide
showed
that
a
chemical
reaction
had
taken
place
.
Increasing
the
surface
area
of
the
reactants
will
the
rate
of
the
reaction
.
The
amount
of
a
substance
in
a
given
volume
is
the
of
the
substance
.
Adding
a
catalyst
to
a
reaction
will
the
activation
energy
of
the
reaction
.
Adding
an
inhibitor
to
a
reaction
will
the
activation
energy
of
the
reaction
.
In
an
endothermic
reaction
,
the
energy
of
the
products
is
than
the
energy
of
the
reactants
.
In
an
exothermic
reaction
,
the
environment
becomes
.
Any
substance
that
speeds
up
or
slows
down
a
biological
chemical
reaction
is
called
a
(
n
)
.
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