an exothermic reaction
how chemical energy produce in firewood useful
Burning release heat, the molecular structure of methane is destroyed and the bonding energy is released.
combustion
Many substances can "cause" (or participate in) exothermic reactions. An exothermic reaction is a reaction that gives off thermal energy, as opposed to an endothermic reactionwhich requires the input of energy to occur. A classic example of an exothermic reaction is the burning of gasoline in an automobile engine. Gasoline is ignited to induce an exothermic combustion reaction with free oxygen in the air. The reaction causes the release of thermal energy which is converted to mechanical energy as the resulting gasses expand inside the engine's combustion chamber. Excess thermal energy is also released into the cylinder walls of the engine. So much so that your car has a coolant system just to absorb the excess thermal energy into a water-based coolant, and dissipate it from your radiator. Lots of heat energy being given off=exothermic reaction. And again, there are many different exothermic reactions involving many different substances.
The release of energy (exothermic reaction) happens when the energy release by forming the products of the reaction is greater than the energy required to break the bonds of the reactants.
an exothermic reaction
Exothermic reactions release heat into the system, ie. heat is a product of the reaction and thus the products have less energy than the reactants and the change in enthalpy is negative.Exothermic reactions release heat. Like potassium into water
Water is created in the chemical reaction of gasoline 'oxidizing' (burning).
Gasoline is a combination of several hydrocarbons which when oxidized (chemical reaction) release heat energy.
how chemical energy produce in firewood useful
Gasoline is an example of energy being released by and exothermic reaction. Which is caused by the breaking of bonds and the creation of new bonds which use a lesser energy to form than the energy release by the previous bonds.
Burning of coal is an exothermic chemical reaction (with release of heat).
Nothing "creates" energy. The chemical energy in gasoline can be converted to electrical energy by burning the gasoline in an internal combustion engine that's connected to a generator.
Chemical energy to mechanical energy
Yes burning of coal is an exothermic reaction because energy is released in this process in the form of heat and light.
It is not. Gasoline is not energy. Rather, it HAS energy.If gasoline is burned or otherwise combines with oxygen, energy is released. This type of energy (related to how atoms are connected with one another) is called "chemical energy".
Burning release heat, the molecular structure of methane is destroyed and the bonding energy is released.