Foundations of Physical Science

Workshop: Periodic Table Tiles

Chemical Equations and

RecipiesCPO Science

Key QuestionsHow can we model the rearrangement of atoms that happens during a chemical reaction?

How can we predict chemical formulas?

Chemical reactions and the

environmentWhat 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

massFor 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

H2CO3 H2O + CO2

heat

CaCl2 + NaHCO3 NaCl + CaCO3 +

H2CO3

Molecular Crossword GameSimilar 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