View the video below to see what you and your students will do in this lesson. Because substances are made up of different atoms and molecules, they react in characteristic ways. Production of a gas, ...

They’re called endothermic reactions. If you take some citric acid solution and combine it with baking soda, we can see the reactants fizzing away. And the surrounding flask feels cold.

These include citric acid in lemon ... product of the fizzy reaction, sodium acetate, is the undercover cleaning agent. Unfortunately, sodium acetate is an even weaker base than baking soda ...