Station 1
1. What are the three parts of an atom and what are their charges?
2. What is an atom?
3. What is an element?
4. What does the atomic number tell us?
5. What is an isotope?
6. What is an ionic bond?
7. What is a covalent bond?
Station 2
Directions: You may use your periodic table for the following questions.
1. For each element listed, identify the number of protons, neutrons, and electrons.
Aluminum (Al)
Tin (Sn)
P_____________
N_____________
E_____________
P_____________
N_____________
E_____________
2. For each element listed, draw the Bohr model.
Additionally, identify the oxidation number of the element as well as what oxidation number it
needs to bond with.
List 2 examples of elements of that oxidation number with which it will bond to become stable.
If it is already stable and would not bond with another element, write “stable.”
Magnesium (Mg)
Helium (He)
Oxidation #_______
Oxidation #_________
Bonds with ox. #__________
Bonds with ox. #__________
Two examples:__________________________________
Two examples:_____________________________
__________________________________
__________________________________
3. Happy or Unhappy? Fill in the chart below to determine if the compound is stable (happy) or
unstable (unhappy).
Chemical Formula Oxidation Numbers for
(Compound)
Each Element
KOH
AlO2
Sum of Oxidation
Numbers
Happy or Unhappy?
Station 3
1. Why are water molecules attracted to each other?
2. Why does water dissolve salt? Explain which atoms in water are attracted which atoms in salt.
3. Can polar substances dissolve nonpolar substances? Why or why not? Explain!
4. You put a drop of water and a drop of alcohol on a paper towel and saw that the alcohol
evaporated faster than the water. Alcohol molecules are not as polar as water molecules. Use the
difference in polarity between water and alcohol molecules to explain why alcohol evaporates
faster than water.
Station 4
1. What does it mean to say that “atoms are not created or destroyed” in a chemical reaction?
2. In this chemical reaction between methane (CH4) and oxygen gas (O2), the products carbon dioxide (CO2) and
water (H2O) are formed.
Explain what happens during a chemical reaction that causes the atoms in the reactants to end up in the products.
3. How do you know that the chemical equation in #2 (above) is balanced?
4. What is the difference between a chemical and a physical change?
5. For the chemical reaction below, identify the number of each atom present in the products and
reactants.
H2SO4 + 2NaOH ----- Na2SO4 + 2H2O
Reactants
Hydrogen
Sulfur
Oxygen
Sodium
Products