Is melting chocolate an endothermic or exothemic?

Answer 1

Freezing of ice cream is Exothermic, Because you must remove heat from the ice cream to freeze it. The Heat flow is negative when the ice cream is your system, you are moving the heat from the ice to the surroundings most likely a freezer. This is how a Freezer cools items it does not add cold (there is no such thing just heat) it removes heat from the item inside and convects it on to its self and eventually to the air, so the freezer is endothermic.

Answer 2

An exothermic reaction is one that gives out heat when the component parts are combined, for example - mixing water and plaster of Paris or water and caustic soda.

When you mix the ingredients for cookies or a cake the mixing bowl does not get hot. You need to place the product into a heated oven in order to turn the mixture into a cake or cookies. The ingredients absorb the heat energy and chemical changes take place - the toughening of protein, sugar and fat changing from solid to liquid, baking powder releasing carbon dioxide and so on. Therefore baking is an example of an endothermic reaction.

Answer 3

Endothermic.

Answer 4

exothermic.