What term refers to the amount of energy needed to begin a chemical reaction
I believe the term you are looking for is energy of activation. The activation energy of a reaction is usually denoted by Eaand given in units of kilojoules per mole.
activation energy
added to a reaction in the form of heat.
Endothermic reactions need heat. Exothermic reactions give off heat.
This is a very fast reaction.
Collision theory states that when suitable particles of the reactant hit each other, only a certain amount of collisions result in a perceptible or notable change; these successful changes are called successful collisions. The successful collisions must have enough energy, also known as activation energy, at the moment of impact to break the pre-existing bonds and form all new bonds. This results in the products of the reaction. Increasing the concentration of the reactant brings about more collisions and hence more successful collisions. Increasing the temperature increases the average kinetic energy of the molecules in a solution, increasing the amount of collisions that have enough energy. Collision theory was proposed independently by Max Trautz in 1916 and William Lewis in 1918.
Two types of energy changes that can occur in a chemical reaction are (1) endothermic and (2) exothermic. Endothermic is where energy is added to the system and exothermic is where energy is given off by the system.
Activation energy is the amount of energy that should be gained by potential reactants, for a reaction to occur. A reaction can be occurred by reducing the activation energy of the reaction or increasing the activation energy of the reactants. Activation energy should be added.
added to a reaction in the form of heat.
If thermal energy must be added to a chemical reaction for the reaction to take place the reaction is endothermic.
Any chemical reaction need an activation energy.
Either an energy source to start the reaction or a catalyst.
Catalysts. They lower the amount of energy needed for the reaction to occur.
activation energy
Endothermic reactions need heat. Exothermic reactions give off heat.
A catalyst speeds up the rate of reaction, and lower the activation energy needed.
No. It's just a change of state.
This is a very fast reaction.
A catalyst changes the reaction mechanism to one with a lower activation energy; activation energy is lowered when a catalyst is added