Anchor Phenomenon Ideas: Hook students with a glow stick or hot pack/ ice pack demo. Let kids discuss what they think is happening and why. Then, use the questions they come up with to make connections throughout your unit.
Make it Relevant: Share the engineering design project for the summative assessment and talk about when students have wanted to keep something hot or cold. Would this product be marketable? How would it be different than a cooler?
Tips and Tricks: In chemical reactions, energy is used to break bonds in reactants. Energy is released when new bonds form as products are made. This may not be intuitive for students. Write these statements on the board or have kids make posters explaining energy transfer in chemical reactions.
Temperature decreases and the reaction is endothermic when mixing baking soda and vinegar. Ammonium chloride dissolving in water is also endothermic. The reaction between calcium chloride and water is exothermic and releases energy.
Extension Ideas: As students investigate if fermentation is an endothermic or exothermic reaction, encourage them to compare recipes that call for yeast and those that do not - like quick breads. If possible, have students bake both and serve them in class for a taste test!