Foundations of Physical
Science
Workshop: Periodic Table Tiles
Chemical Equations
and Recipies
CPO Science
Key Questions
How can we model the
rearrangement of atoms that
happens during a chemical
reaction?
How can we predict
chemical formulas?
Chemical reactions
and the environment
 What are the features of a
chemical reaction? What
general things happen on the
atomic level?
 How can we model a chemical
reaction on paper?
Obeying the law of
conservation of mass
For a completely correct
model, we must be sure that
there are equal numbers of
each type of atom on left
and right side.
Using the periodic table tiles to
model chemical reactions
 Inventory and organize tiles in bag labeled
“Modeling equations”
 Model the reactants only, using correct
chemical formulas
 USING ONLY THE REACTANT TILES, try to
form the products.
 What happened?
 Fill in the chart
What if products cannot be formed
by using only reactant tiles?
 Something must be done so the
law of conservation of mass is
obeyed in our model
 Model the entire equation as is, and
then fill in the chart.
Observe a chemical
reaction
 Make sure the bag is sealed
tightly
 Unscrew the vial top without
opening the bag
 Mix the contents and note all
observations
What evidence is there that a
chemical reaction has
occurred?
What are the reactants?
What are the reactants?
Calcium chloride: ice melt or
driveway “heat”
CaCl2
Sodium bicarbonate: baking
soda
NaHCO3
What about the red
liquid?
 Phenol Red acts as an
indicator
 The water component of the
Phenol Red solution acts as a
solvent for solid reactants
CaCl2 + NaHCO3  ?
What are the products?
 Sodium chloride: table salt
NaCl
 Calcium carbonate: chalk
CaCO3
 Carbonic acid: found in cola
H2CO3
CaCl2 + NaHCO3  NaCl + CaCO3 + H2CO3
heat
H2CO3  H2O + CO2
CaCl2 + NaHCO3  NaCl + CaCO3 + H2CO3
Molecular Crossword Game
 Similar to Scrabble
 Each player maintains 10 tiles
 Use periodic table with oxidation
numbers to form compounds and
molecules
 Add up atomic numbers to
determine score
Playing Molecular Crossword
 Either side of tile can be used; + and arrow
tiles are “wild tiles”
 Atoms may be arranged in any order,
horizontal or vertical
 Oxidation numbers must add up to zero
 Score = sum of atomic numbers
 Correct challenge: challenger scores 25, player
loses turn
 Incorrect challenge: challenger loses 25, play
continues