When I put the same reactants in an insulated cup to stop heat being transferred from the surroundings, the temperature drops quickly. These exothermic and endothermic reactions can be really ...

If more energy is released when water bonds to the solute than it takes to separate the solute, the dissolving is exothermic and the temperature increases. If less energy is released when water ...

Two dry solids --- barium hydroxide and ammonium nitrate --- are mixed to produce an endothermic reaction. The temperature of the mixture drops approximately 45oC and is cold enough to freeze the ...

This is shown by larger energy arrows coming out of the products and smaller energy arrows going into the reactants. In this reaction, the temperature goes down, so it is endothermic. In an ...

Heat packs that contain supersaturated sodium acetate: These are reusable, the packs are boiled to dissolve sodium acetate. Inside is a metal clicker, once the pack cools to room temperature, ...