Chemical reactions that require energy?

Reactions that require energy in the form of heat are called endothermic.

because chemical reactions cannot react spontaneously

All chemical reactions require a certain amount of activation energy to get started.

False All chemical reactions require an initial input of energy called activation energy.

"Activation Energy reactions"; Endothermic reactions require energy.

All chemical reactions require water. :)

These chemical reactions are called endothermic. Examples: combustion, thermal decompostion.

Normally energy is given off when chemical bonds are formed. Sometimes it is required. Exothermic reactions give off energy, endothermic reactions require energy

Not always. Reactions where energy is released are called exothermic. Some reactions require energy to be supplied from outside, these are called endothermic.

All reactions require activation energy.

Chemical reactions that absorb energy are called endothermic. Chemical reactions that absorb free energy are called endothermic reactions. Chemical reactions that release free energy are called exothermic reactions.

Chemical reactions that release energy often occur spontaneously. Chemical reactions that absorb energy will not occur without energy.

Heat energy is necessary for some chemical reactions to occur. Some chemical reactions are endothermic meaning they require or absorb energy for a chemical reaction to occur. Other chemical reaction are exothermic meaning they release energy when the chemical reaction takes place..

Chemical reactions that release heat (or light) energy are known as exothermic reactions.

Nuclear energy is not released in chemical reactions.

No, some chemical reactions take in energy

Yes, most chemical reactions involved in metabolism do require water.

Generally, the energy required to initiate the reaction. Reactions that release energy (exothermic) can proceed faster than those that require energy to be added (usually in the form of heat energy).

No, it is nothing to do with chemical reactions

Endothermic reactions require energy while exothermic reactions release energy.

no, chemical energy is the energy released from chemical reactions

The chemical reactions convert the mechanical energy to electrical energy.

Chemical reactions that release energy often occur spontaneously. Chemical reactions that absorb energy will not occur without energy.

Nearly always, but there are compounds which formed endothermically, so their decomposition gives out energy.

The light dependent reactions take in the light energy and convert that to chemical energy, but it is in the Calvin cycle (light independent reactions) where the chemical energy is stored in a complex sugar.