1 Bell Ringer Active on SOCRATIVE (room:crice) OR Grab a paper copy! Turn it in to the tray and look...
-
Upload
mariah-wilkerson -
Category
Documents
-
view
215 -
download
0
Transcript of 1 Bell Ringer Active on SOCRATIVE (room:crice) OR Grab a paper copy! Turn it in to the tray and look...
1
Bell RingerActive on SOCRATIVE
(room:crice)
OR
Grab a paper copy!
Turn it in to the tray and look over the Lab Procedure and
today’s notes.
2
Chemical Reactions & Balancing Equations
3
Chemical Reactions
2 Parts:
Reactants: substances at the start
Products: substances at the end
The reactants turn into the products.
Reactants Products
4
Equation Format:
“+” means “reacts with” or “and”
“” means “yields” or “forms”
Reactants written on LEFT side
Products written on RIGHT side
5
Inquiry Lab
Effervescent Tablet –Na(HCO3) & C6H8O7
NaHCO3+ C6H8O7 Na3C6H8O7 + H2O + CO2
sodium + citric sodium + water + carbon bicarbonate acid citrate dioxide
6
In a Chemical Reaction The way atoms are joined is changed Atoms are neither created nor destroyed.
–This is the Law of Conservation of Matter
Balanced Equation: – Each element has same # of atoms on
both sides of the equation.
7
C + O2 CO2
This equation is already balanced
– same number of atoms of each type of element on each side
What if it isn’t balanced already?
C + OO COO
8
C + O2 CO
C + OCOO
• This is called a skeletal reaction
• Shows all the reactants and products
• Does not show balanced quantities
If it is NOT Balanced Already…
9
Cooking Analogy for Chemical Reactions:
Skeletal reaction:
– Ingredients & description of meal Balanced reaction:
– Exact recipe
10
C +O
COO
OC
• Add molecules until there is an equal number of atoms on both sides. • Use only molecules or atoms
already in the formulas• No new compounds used or
created• Start with the element you need
more of!
Skeletal Reaction Balanced Equation
11
C +O
COO
OC
1C O2 2C & 2O
•The 2 subscript on Oxygen means there are 2 of them in the molecule.•Still not balanced need 1 more C on the reactant side.
Skeletal Reaction Balanced Equation
12
C
+O
C
OO
OC
C
2C O2 2C & 2O
Equation:2C + O2 2CO
13
C
+O
C
OO
OC
C
2C + O2 2COCoefficient:
•Large Number left of the compound formula.
•Represents the number of molecules/atoms• Helps to balance the equations • makes # of atoms on left side = # on
right side
14
2C + 2O2 2CO2
2C 4O 2C & 4O•Notice the subscript only applies to the element it is next to!
• Coefficients & Subscripts on the same molecule
• The numbers must be multiplied to determine the number of atoms of that element.