Counting Atoms class notes.notebook
Name:________________________________________________________ Period:_______
Intro to Chemistry ­ Bohr Models and Bonding
Exit slip
Directions: Give as much information as you can.
1.
How many different types of atoms are there?
2.
A bond holds atoms together. What exactly is a bond?
3.
What type of bond holds together the compound Calcium chloride?
Oct 3­4:10 PM
Back #1
Identifying a Bond
Now for the quick and easy method...
Back #2
Ionic Bonds are between a Metal and a Non­Metal
Covalent Bonds are between a Non­Metal and a Non­Metal
Sep 28­8:53 AM
1
Counting Atoms class notes.notebook
Let's
Practice:
P.T.
C
O
O
1. What type of bond?
2. What is the name of this molecule?
3. How many atoms make up this molecule?
Oct 1­8:55 AM
P.T.
Lets Practice...
Directions: Below are different compound names. On the lines provided write the chemical formula for the compound, what type of bond is formed and how many atoms make up the compound.
You would only know there are 2 P's if you did Bohr diagrams!
1) Phosphorus pentoxide:
Formula:____________
Bond:____________
2)Lead monoxide:
Formula:____________
# atoms: _____
# atoms: _____
Bond:____________
3) Nitrogen dioxide:
Formula:____________
Bond:____________
4) Calcium carbonate: (chalk)
Formula:____________
Bond:____________
Ca
# atoms: _____
O
C
O
# atoms: _____
O
Sep 28­9:08 AM
2
Counting Atoms class notes.notebook
How could we represent that we were talking about 6 molecules of CaCO3?
Ca
O
C
O
Ca
O
O
Ca
O
C
O
O
Ca
Ca
O
Ca
O
C
O
O
O
O
O
C
O
C
O
O
C
O
How many atoms in 6 molecules of CaCO3?
Oct 1­9:08 AM
Let's Practice.....
Number of Molecules Number of Atoms
1. 7NH3
_______
_______
2. H2CO3
_______
_______
3. 3H2SO4
4. 5C6H12O6
_______
_______
_______
_______
Oct 1­9:15 AM
3
Counting Atoms class notes.notebook
How can we write what we have here?
O
O
O
O
O
H
H
H
H
H
C
O
O
O
H
C
O
C
H
H
H
H
O
C
H
O
O
O
O
H
Oct 3­4:52 PM
Under the right conditions, atoms will dissociate and re­combine!
Think about how atoms are held together­ is it permanent?
O
O
H
H
H
H
H
H
H
H
O
O
O
O
C
H
O
H
H
O
H
O
C
O
O
C
O
O
C
O
Oct 3­4:52 PM
4
Counting Atoms class notes.notebook
How can we write down what just happened?!
We use a "chemical equation":
Oct 3­5:13 PM
That's all folks!!
Time for the "Lego Lab"...
The End
5
Counting Atoms class notes.notebook
Lego Lab Equations
#1 CH4 + 2O2 CO2 + 2 H2O
#2 2Al + Fe2O3 Al2O3 + 2Fe
#3 3H2 + N2 2NH3
#4 2NaCl + H2SO4 Na2SO4 + 2HCl
#5 2H2 + O2 2H2O
#6 NaOH + HCl NaCl + H2O
Sep 24­10:38 AM
6