Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

Chemical Formulas and and equations

No description
by

Hanna Berg

on 21 July 2013

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Chemical Formulas and and equations

Chemical Formulas And Equations
Chemical Formulas
Chemical Equations
What are
the letters?
The letters are known as
Chemical
Symbols
.Each
element
has its
own
Chemical Symbol.
The
Chemical Symbols
stand in for the full name of the
element
What are the
numbers?
The numbers are Known as
Subscripts.
Subscripts
tell how many
molecules
of each
element
are in a
compound
.
Example of a
chemical formula
...
H
2
O
Dihydrogen Monoxide
(Water)
H
2
O
Dihydrogen monoxide
(water)
Chemical symbol
for
Oxygen
Chemical symbol
for
Hydrogen
H O
Dihydrogen Monoxide
(water)
Chemical Symbol
for
Oxygen
Chemical Symbol
for
Hydrogen
Subscript
2
So therefore one
Dihydrogen Monoxide
(water)
molecule
is made of two
Hydrogen

atoms
and
one
Oxygen

atom
.
N O
2
C H O
6
8
7
C H O
12
22
11
NaCl
KO
2

H O
2 2
YbF
3
Es O
2 3
What is a
Chemical Equation
?
A
Chemical Equation
is a shorthand
way to describe a
Chemical Reaction

using
Chemical Symbols
and
subscripts
.
Why do
Chemical Equations
have to be so accurate?
Example of a
Chemical Equation
...
H +O=H O
2 2

Two
Hydrogen
+
One
Oxygen
=
Dihydrogen Monoxide
(water)
Example of a
Chemical Equation
...
H +O=H O
2 2
Two
Hydrogen
+One
Oxygen
=

Dihydrogen Monoxide
(water)
If you make an error on just one letter
or
subscript
you could come up with a
completely different
formula
.
for example...
Co=
Cobalt
CO=
Carbon Monoxide
CO =
Carbon Dioxide
2
Balancing
Equations
Sometimes
Chemical Reactions
use
Elements
called
Diatomic Molecules
. Because diatomic molocules have two attached molucules we have to
Balance the Equation
. We
Balance the Equation
So that we keep the
Law of Conservation of Mass.
Diatomic Molecule
How to
Balance An Equation
...
Dihydrogen Monoxide
+
=
-First we count the
atoms
. We see that there is one extra
Hydrogen

Atom
because
Hydrogen
is
Diatomic
.
-Now we double the
Oxygen

Atoms
and come out with two
Dihydrogen Monoxide

molecules
. So we put a large Two in front of

the
Hydrogen
in
Dihydrogen Monoxide
.
Two
Hydrogen
+ Two
Oxygen
=
Dihydrogen Monoxide
=
+
Two
Hydrogen
+ Four
Oxygen
= Two
Dihydrogen Monoxide
H +O = 2H O
2
4
An Element... Poison... In the air we breath...
2
Prefixes and Suffixes
What is the
Law Of Conservation Of Mass
?
The
Law Of Conservation Of Mass
is a
theoretical law
that states in a
Chemical Reaction
,
chemical mass
can neither be
created
nor
destroyed
.
The
Mass
stays the same
no matter what
Physical
or
Chemical changes
it
goes through.
What do
prefixes
and
suffixes
have to do
with
chemical equations
and
formulas
?
-Mono= One
-Di = two
-Tri = Three
-Tetra = four
-Penta = five
-Hexa = six
-Hepta= seven
-Octa = eight
-Nona = nine
-Deca = Ten
Prefixes for
Chemical Formulas
Prefixes
are important because they show how many
Molecules
of each
element
are in a
compound
. We use them instead of
subscripts
in the
compounds
full name.
Suffixes
show what kind of
bond
holds the
compound
together.
If there is only one
molecule
of the
element
in a
compound
we put a
prefix
only if the
element
is not in front.
For example...
Potassium
Di
oxide
(KO )
Di
hydrogen
Mono
xide
(H O)
2
2
So overall, Chemical Formulas and Equations will be easy to comprehend
if you remember what we learned and said...
The End...
There is one
potassium

molecule
in
Potassium Dioxide
but since
Potassium
is in front we do not add the prefix for
one.
But since the one
oxygen
molecule
in
Dihydrogen
Monoxide
comes second it has a
prefix
.
Full transcript