The energy that is needed to start a chemical reaction is called:
a
activation energy
b
chemical reactions do not need energy to start
c
exothermic energy
d
start-up energy
a. activation energy
The energy that is needed to start a chemical reaction is called "activation energy" (option a).
The correct answer is a) activation energy.
Chemical reactions require a certain amount of energy to begin. This initial energy is known as activation energy. It acts as a barrier that needs to be overcome before the reaction can proceed. Activation energy helps to break the existing bonds in the reactant molecules and allow new bonds to form in the product molecules. Once the reaction starts and enough energy is provided, it becomes self-sustaining, and the reaction proceeds to completion.
To determine the answer, you can understand the concept of activation energy and how it relates to chemical reactions. Additionally, you can also refer to reliable sources, such as textbooks or educational websites, that explain the concept of activation energy in more detail.