What must happen before a chemical reaction can begin quizlet?

What must happen before a chemical reaction can begin? The activation energy must be reached. Which statement best describes how a catalyst can speed up a chemical reaction? The catalyst makes lower energy pathways available.

What is needed in order for a chemical reaction to begin?

All chemical reactions need energy to get started. Even reactions that release energy need a boost of energy in order to begin. The energy needed to start a chemical reaction is called activation energy. Activation energy is like the push a child needs to start going down a playground slide.

What must happen for a chemical reaction can be?

According to the modern view of chemical reactions, bonds between atoms in the reactants must be broken, and the atoms or pieces of molecules are reassembled into products by forming new bonds. Energy is absorbed to break bonds, and energy is evolved as bonds are made.

What must happen before a chemical reaction can begin the activation energy must be exceeded the activation energy must be reached?

The concentration of reactions and products increase or decrease the rate of the reaction and the activation energy is the energy barrier that has to be exceeded for a reaction to occur. So if we look at a the activation energy must be exceeded.

What is the role of activation energy in a chemical reaction?

Chemical reactions need a certain amount of energy to begin working. Activation energy is the minimum energy required to cause a reaction to occur. … For a reaction to occur, existing bonds must break and new ones form. A reaction will only proceed if the products are more stable than the reactants.

What is a starting substance in a chemical reaction?

The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. Chemical reactions are usually characterized by a chemical change, and they yield one or more products, which usually have properties different from the reactants.

What happens when the transition state is reached?

The transition state is a high-energy state, and some amount of energy – the activation energy – must be added in order for the molecule reach it. Because the transition state is unstable, reactant molecules don’t stay there long, but quickly proceed to the next step of the chemical reaction.

What is threshold energy in chemistry?

The minimum energy that all colliding molecules must possess in order to make the collisions effective and successfull is called threshold energy.