Today’s Goal: Students will be able to model various bonds between
atoms to create molecules.
Focus: How do atoms combine to form molecules?
Main Learning Goal: Understand and explain the structure of atoms and molecules..
- Be able to explain and draw differences between atoms and molecules
- Describe and draw parts of the atom
- explain how atoms, compounds, and molecules make up common materials
Date:
Tues 11/19/13
Title:
Activity 17- Modeling Molecules
Key Words: atom, chemical bond, chemical formula, compound,
element, molecule
Warm Up: If you have an atom with atomic number 15, atomic mass of
31. What is the element? How many Protons, Electrons, and Neutrons?
On Desk:
Pen/pencil
 Lab Notebook
 Science Book
 Science Folder with Glossary
●
 I will be checking Reflection and Atom Worksheet
We will:
 Review Atom worksheet
 Review notes including structure of atom
 Read 17 intro, p. B-31
 Complete Procedures 1-10, Part A, p. B-32 with partner and teacher
guidance- Be sure to draw molecule in lab book.
BEFORE LEAVING CLASS:
Reflection: Describe what you did today…
Homework- none
Today’s Goal: Students will be able to model various bonds between
atoms to create molecules.
Focus: How do atoms combine to form molecules?
Main Learning Goal: Understand and explain the structure of atoms and molecules..
- Be able to explain and draw differences between atoms and molecules
- Describe and draw parts of the atom
- explain how atoms, compounds, and molecules make up common materials
Date:
Tues 11/19/13
Title:
Activity 17- Modeling Molecules
Key Words: atom, chemical bond, chemical formula, compound,
element, molecule
Warm Up: If you have an atom with atomic number 15, atomic mass of
31. What is the element? How many Protons, Electrons, and Neutrons?
On Desk:
Pen/pencil
 Lab Notebook
 Science Book
 Science Folder with Glossary
●
 I will be checking Reflection and Atom Worksheet
We will:
 Review Atom worksheet
 Review notes including structure of atom
 Read 17 intro, p. B-31
 Complete Procedures 1-10, Part A, p. B-32 with partner and teacher
guidance- Be sure to draw molecule in lab book.
BEFORE LEAVING CLASS:
Reflection: Describe what you did today…
Homework- none
Copy the following to your Glossary
Atom -
Smallest particle of an Element
Subatomic Particles- Proton, Electron, Neutron
A. Nucleus center of an atom containing protons and neutrons
1. Protons The number of protons determines what element it is; which is the atomic number
a. positive (+) charge
b. determines atomic number to identify element
c. Mass of one proton = 1 amu (atomic mass unit)
2. Neutrons
a. no charge
b. mass of one neutron= 1 amu
B. Outside of Nucleus Electron cloud
1. Electrons
a. negative (-) charge
b. Within electron cloud
c. Same number electrons as protons in neutral atom.
d. Nearly zero mass (2000 times smaller in mass then proton)
Remember:
Atomic Number = # of protons
Atomic Mass number (mass rounded to nearest Whole number)
= # of protons + # of neutrons
Therefore: # of neutrons = mass # - # of protons (atomic number)
A. Neutral Atoms- assume atom is neutral unless indicated
# of Electrons = # of Protons (Charges cancel out)
B. Ions
1. Electrically charged atoms because they have lost or gained
electrons
a. If lost electron- positive ion (Na+)
b. If gained electron- negative Ion (Cl-)
C. Isotopes- same element (same atomic number)
1. But different # of neutrons (so different mass #’s)
Chemical Bond- an electrical attraction between atoms (elements) that
forms a molecule (compound)
Copy the following to your Glossary
Atom -
Smallest particle of an Element
Subatomic Particles- Proton, Electron, Neutron
A. Nucleus center of an atom containing protons and neutrons
1. Protons The number of protons determines what element it is; which is the atomic number
a. positive (+) charge
b. determines atomic number to identify element
c. Mass of one proton = 1 amu (atomic mass unit)
2. Neutrons
a. no charge
b. mass of one neutron= 1 amu
B. Outside of Nucleus Electron cloud
1. Electrons
a. negative (-) charge
b. Within electron cloud
c. Same number electrons as protons in neutral atom.
d. Nearly zero mass (2000 times smaller in mass then proton)
Remember:
Atomic Number = # of protons
Atomic Mass number (mass rounded to nearest Whole number)
= # of protons + # of neutrons
Therefore: # of neutrons = mass # - # of protons (atomic number)
A. Neutral Atoms- assume atom is neutral unless indicated
# of Electrons = # of Protons (Charges cancel out)
B. Ions
1. Electrically charged atoms because they have lost or gained
electrons
a. If lost electron- positive ion (Na+)
b. If gained electron- negative Ion (Cl-)
C. Isotopes- same element (same atomic number)
1. But different # of neutrons (so different mass #’s)
Chemical Bond- an electrical attraction between atoms (elements) that
forms a molecule (compound)