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 Reactions

No description
by

Courtney Comperry

on 6 February 2014

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Chemical Reactions

OH
Chemical
Chemical Changes
Chemical Property
Chemical Equations Must...
1. represent known facts
2. contain the correct formulas for the reactants and products
3. satisfy the law of conservation of mass
ANSWER THE FOLLOWING QUESTIONS ON YOUR OWN PAPER
Unit 6:
Reactions
Book sections 2.4 11.1 & 11.2
(this should be a review)
the ability of a substance to undergo a specific chemical change.
Iron is able to combine with oxygen to form rust.
EX
*During a
CHEMICAL CHANGE
,
the composition of matter
ALWAYS
changes*
A chemical change can also
be called a chemical reaction.
Chemical Rxn
: a change of one or more substances into one or more new substances.
reactants
products
a substance present at the start of the reaction
a substance produced in the reaction
Indications of a
1. Evolution of heat and light.
chemical reaction
2. Production of a gas.
3. Formation of a precipitate.
4. Color Change
a solid that forms
and settles out of a liquid
Types of
Chemical Reactions
1. Synthesis or Composition Reaction
A + X – AX
2. Decomposition Reaction
AX A + X
3. Single-Replacement Reaction
A + BX AX + B
Y + BX BY + X
4. Double-Replacement Reaction
AX + BY AY + BX
5. Combustion Reaction
C H + 5 O 3 CO + 4 H O
3
8
2
2
2
synthesis reaction
two or more substances
combine to form a new compound
decomposition reaction
a single compound undergoes a reaction
that produces two or more simplier products
single-replacement reaction
one element replaces a similar element
in a compound
double-replacement reaction
the ions of two compounds exchange places in an
aqueous solution to form two new compounds
combustion reaction
a substance combines with oxygen,
releasing large amounts of energy in
the form of light and heat
Classify the
following chemical reaction
N + 3 H 2 NH
2
2
3
2 Li + 2 H O 2 LiOH + H
2
2
2 NaNO 2 NaNO + O
3
2
2
2 C H + 19 O 12 CO + 14 H O
6
14
2
2
2
AgNO + NaCl AgCl + NaNO
3
3
law of conservation of mass
atoms are neither created nor destroyed in ordinary chemical reactions
The same number of atoms of each element must appear on each side of a correct chemical equation
*
Which equation obeys the
law of conservation of mass?
H + O H O
2
2
2
2 H + O 2 H O
2
2
2
coefficient
a small whole number that appears in front of a formula in a chemical equation
Word vs. Formula Equation
methane + oxygen
carbon dioxide + water
Diatomic molecules are
elements that exist as two atoms
Hydrogen H
Nitrogen N
Oxygen O
Fluorine F
Chlorine Cl
Bromine Br
Iodine I
2
2
2
2
2
2
2
yield
CH (g) + O (g) CO (g) + H O (g)
4
2
2
2
yield
Symbols Used in Chemical Equations
(s)
(l)
(g)
(aq)
solid state
liquid state
gaseous state
aqueous; dissolved in water
CH + O CO + H O
4
2
2
2
Molecules:
Atoms:
C
H
O
1
4
2
1
2
3
* We must add coefficients to balance the atoms
Balancing Chemical Equations
2
1
4
1
4
1
2
4
EX
Write word and formula equations for the chemical reaction that occurs when solid sodium oxide is added to water at room temperature and forms sodium hydroxide.
Na
+1
O
-2
Na O + H O
2
sodium oxide + water
2
sodium hydroxide
-1
NaOH
Na
+1
think about the ions that form these compounds
now balance the equation
2
Balance the following equations
2
2
2
3
8
12
2
2
2
2
6
6
6
2
4
4
2
2
2
2
Page 347 # 36, 39, 41, 42, 43, & 52
* Show work when balancing equations
Conversion factors
mole to mass
mole to atoms
mass to moles
atoms to moles
# moles A
1 mole A
# grams A
1 mole A
# grams A
# grams A
# moles A
1 mole A
6.02x10 atoms A
23
6.02x10 atoms A
23
1 mole A
# atoms A
a new conversion factor
MOLE RATIO
a conversion factor that relates the amounts in moles of any two substances involved in a balanced chemical reaction
2 Al O 4 Al + 3 O
2
3
2
2 mol Al O = 4 mol Al
2
3
2 mol Al O = 3 mol O
2
3
2
4 mol Al = 3 mol O
2
EX: How many moles of lithium hydroxide are required to react with 20 moles of CO ?
2
CO + 2 LiOH Li CO + H O
2
2
3
2
20 moles CO
2
1 mole CO = 2 moles LiOH
2
1 mole CO
2
2 moles LiOH
= 40 moles LiOH
Given the reaction:
4 Fe + 3 O 2 Fe O
2
2
3
How many moles of O are needed if we wish to make 6 moles of Fe react?
2
6 moles Fe
4 mole Fe = 3 moles O
2
4 mole Fe
3 moles O
2
= 4.5 moles O
2
Full transcript