Which of the following best describes the activation energy of a reaction?
The answer is B as activation energy is the least possible amount of energy (minimum) which is required to start a reaction or the amount of energy available in a chemical system for a reaction to take place.
What would increase the rate of a reaction?
A higher concentration of reactants leads to more collisions per unit time and leads to an increasing reaction rate. Changing the pressure of gaseous reactants is, in effect, changing their concentration. The increased number of collisions caused by a higher pressure generally increases the reaction rate.
Why does an exothermic reaction need activation energy quizlet?
All chemical reactions, even exothermic reactions, need activation energy to get started. Activation energy is needed to bring reactants together so they can react. Factors that affect the reaction rate include catalysts and the temperature, concentration, and surface area of reactants.
What is needed to start a reaction?
For the reaction to start, activation energy must be added. An electric spark or adding heat can provide that energy. A few of the hydrogen and oxygen molecules will react, producing energy for even more molecules to react. Every chemical reaction needs activation energy to start.
What is the energy required to start a reaction?
Activation energy
What type of energy is used in chemical reaction?
Because chemical energy is stored, it is a form of potential energy. When a chemical reaction takes place, the stored chemical energy is released. Heat is often produced as a by-product of a chemical reaction – this is called an exothermic reaction.
What is an example of combustion reaction?
A combustion reaction occurs when a substance reacts quickly with oxygen (O2). For example, in the Figure below, charcoal is combining with oxygen. The products of a complete combustion reaction include carbon dioxide (CO2) and water vapor (H2O). The reaction typically gives off heat and light as well.
What is the meaning of combustion?
Combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame.