Combustion reactions can only be exothermic. In chemical reactions, old bonds are broken to form new ones. Depending on the energy difference between broken and formed bonds, the total reaction energy is either positive ... More » Science Chemistry

Combustion reactions have a variety of uses including the burning of fuel that provides heat for the home or power for an automobile. Combustion of natural gas or propane gives the heat to cook one's food. Combustion of ... More » Science Chemistry

Real life examples of single replacement reactions include the exterior of the Statue of Liberty and processes in the steel industry. The reaction takes place between different metals or halogens. More » Science Chemistry
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Chemical reactions occur when two molecules collide with each other in a certain orientation and amount of force, which causes a chemical change due to the breaking and forming of the bonds between the atoms. Bonds are b... More » Science Chemistry

Cooking is related to chemistry because the preparation of many types of foods involves chemical reactions. When cooks understand how chemical processes work during cooking, they are able to make adjustments and produce ... More » Science Chemistry

Enzymes either make certain reactions possible or speed up a reaction that would take too long otherwise. An enzyme works using the lock-and-key method. The substrate is the substance acted on by the enzyme. A substrate ... More » Science Chemistry

During endothermic reactions, energy is absorbed from the surrounding environment. The energy is typically transferred in the form of heat energy, and causes the reaction mixture and its environs to cool. A thermometer c... More » Science Chemistry