Chemistry OCR (A) F321 Revision 3 of 4

isotopes and configuration

part 3 of 4

a complete guide to unit 1 exams :) 

HideShow resource information
Preview of Chemistry OCR (A) F321 Revision 3 of 4

First 99 words of the document:

10/12/2011
Elements,
isotopes
and
ionisa/on
energies
Objec/ves
Must
State
that
12C
is
used
as
the
standard
measurement
of
rela/ve
masses.
Should
Define
terms
rela/ng
to
isotopic
and
atomic
mass,
molecular
mass
and
formula
mass.
Could
Use
data
such
as
rela/ve
abundances
to
calculate
rela/ve
atomic
mass.
1

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Defini/ons
is
the
mass
of
an
atom
of
a
single
isotope
rela/ve
to
1/12th
of
a
12C
atom.
is
the
weighted
mean
mass
of
an
atom
of
an
element
rela/ve
to
1/12th
of
a
12C
atom,
taking
into
account
isotopic
abundances.
This
is
the
figure
usually
quoted
on
a
periodic
table,
and
because
it
is
an
average
it
is
oHen
a
decimal
number.
For
example
35.5
for
chlorine.…read more

Page 3

Preview of page 3

Here's a taster:

Worked
example
Chlorine
has
2
isotopes
which
occur
naturally.
These
are
35Cl
and
37Cl.
The
Ar
of
chlorine
is
given
on
the
periodic
table
as
35.5
­
this
is
because
75%
of
the
atoms
that
exist
are
the
isotope
35Cl
and
25%
of
the
atoms
are
37Cl.
(!"#$$ %&")'(("#$$ %&!))&"*"
Calcula/ng
Ar
1. Calculate
the
Ar
of
naturally
occurring
neon
if
the
composi/on
is
90.9%
neon
20,
0.3%
neon
21
and
8.8%
neon
22.
2.…read more

Page 4

Preview of page 4

Here's a taster:

Calcula/ng
Ar
-
answers
1. Calculate
the
Ar
of
naturally
occurring
neon
if
the
composi/on
is
90.9%
neon
20,
0.3%
neon
21
and
8.8%
neon
22.
(!"#! $"" %&")'("#($"" %&$) + ()#) $"" %&&)*&"#&
2. Calculate
the
Ar
of
naturally
occurring
copper
if
the
composi/on
is
69%
copper
63
and
31%
copper
65
(!" #$$ %!&)'(&##$$ %!())!&*!
AfL
­
using
whiteboards
1. A
sample
of
bromine
contains
53.00%
of
bromine
79
and
47.00%
of
bromine
81.
Calculate
the
rela/ve
atomic
mass
of
bromine.…read more

Page 5

Preview of page 5

Page 6

Preview of page 6

Here's a taster:

Mark
Scheme
6…read more

Page 7

Preview of page 7

Here's a taster:

Mark
scheme
7…read more

Page 8

Preview of page 8

Here's a taster:

Mark
scheme
8…read more

Page 9

Preview of page 9

Here's a taster:

Mark
scheme
9…read more

Page 10

Preview of page 10

Here's a taster:

Mark
scheme
Ionisa/on
energies
10…read more

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all resources »