Update: Oriental Trading has 200, smaller, foam blocks for $4.29 with free shipping.
ChemKate is a popular chemistry teacher on social media. She posted a TPT freebie, ion dice. In case you are uncomfortable creating a Teachers Pay Teachers account, the project involves foam dice marked with cations and anions. Use the Flinn Ion Chart as your source for cations (positive ions) and anions (negative ions). The kids roll one cation and one anion to write and name the compound. I’m thinking about making a set.



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