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Which accounts for the increase in the rate of reaction when a catalyst is added to a reaction system. Does the entropy of the reaction increase?
When two molecules react with each other they must form a transition state. The higher the energy of the transition state the less likely it is for the two molecules to react with each other. Catalysts lower the energy of the transition state. This makes it more likely for molecules to react with one another, which speeds up the overall reaction. Entropy is unrelated. Reactions that break apart molecules increase entropy. Reactions that combine molecules together diminish entropy. Both types of reactions can be sped up by catalysts.
How is the rate of a reaction influenced by a catalyst?
The rate of reaction often increases when catalysts are added. Catalysts can either lower the activation energy required for the reaction to happen, so that means more molecules will have enough energy to react than if the activation energy were higher. Catalysts can also be like substrates that act as a site for holding the molecules in the correct position to react. Always remember that molecules need to collide in the correct position with enough energy in order to react, and so catalysts will aid these two requirements and increase the reaction rate. There are catalysts that slow the reaction, but it's not common.
Will increasing the temperature cause an increase in the rate of a reaction?
increased temperture causes rate or reaction to increase.
What is the theory that reacting molecules must hit each other with sufficient energy in order to form products?
This theory is known as the collision theory of chemical reactions. It states that reacting molecules must collide with sufficient energy and proper orientation in order to form products. This energy threshold required for a successful reaction is known as the activation energy.
What is the main advantage of using a warm solution over a cold solution in a chemical reaction?
When solutions are heated, molecules are excited and speed up. This increases the chance that they will "bump" into each other and react, thus increasing the reaction rate. Also, many reactions require a certain Activation energy in the form of heat to even start the reaction.
What molecules are most efficient at storing energy?
Lipids, such as fats and oils, are highly efficient at storing energy because they have a high energy density. Each gram of lipid contains more energy than carbohydrates or proteins. This makes lipids an excellent form of long-term energy storage in the body.
What happens if a pair of colliding molecules possesses less energy than Ea?
If a pair of colliding molecules possesses less energy than the activation energy (Ea) required for a reaction, they will not have enough energy to overcome the energy barrier and form products. As a result, the molecules will simply rebound off each other without undergoing a chemical reaction.
What happens durring a chemical reaction?
During any chemical reaction there will be a spontaneous motion of each atoms/ molecules, and all atoms/ molecules collides with each other, on each collision there will be a microscopic interaction, and, there will be a rearrangement in electronic configuration when a low energy or "symmetry" can be obtained. Due to this reconfiguration the spatial arrangement and motion of atoms/molecules changes which is what we observe.
Which accounts for the increase in the rate of reaction when a catalyst is added to a reaction system. Does the entropy of the reaction increase?
When two molecules react with each other they must form a transition state. The higher the energy of the transition state the less likely it is for the two molecules to react with each other. Catalysts lower the energy of the transition state. This makes it more likely for molecules to react with one another, which speeds up the overall reaction. Entropy is unrelated. Reactions that break apart molecules increase entropy. Reactions that combine molecules together diminish entropy. Both types of reactions can be sped up by catalysts.
Nitrogen Oxide and ozone sometimes react to produce nitrogen dioxide and oxygen The collision between the two molecules does not always lead to a reaction Explain why?
Not all collisions between nitrogen oxide and ozone molecules result in a reaction because the molecules need to have sufficient energy and correct orientation for successful reaction. If the molecules collide with insufficient energy or in the wrong orientation, they will simply bounce off each other without forming any new products. This is known as the collision theory.
It is true that cold usually speeds up reaction rates?
Cold temperatures generally slow down reaction rates because molecules have less kinetic energy to react with each other. This is in contrast to higher temperatures, which typically increase reaction rates by providing more energy for molecules to collide and react.
How is the rate of a reaction influenced by a catalyst?
The rate of reaction often increases when catalysts are added. Catalysts can either lower the activation energy required for the reaction to happen, so that means more molecules will have enough energy to react than if the activation energy were higher. Catalysts can also be like substrates that act as a site for holding the molecules in the correct position to react. Always remember that molecules need to collide in the correct position with enough energy in order to react, and so catalysts will aid these two requirements and increase the reaction rate. There are catalysts that slow the reaction, but it's not common.
What are the main energy storing products of each phase of photosynthesis?
The main energy-storing product of the light-dependent phase of photosynthesis is ATP (adenosine triphosphate) and NADPH. In the light-independent phase, the main energy-storing product is glucose.
Will increasing the temperature cause an increase in the rate of a reaction?
increased temperture causes rate or reaction to increase.
How do enzymes help accelerate reactions?
Chemical reactions involve collisions between molecules. most collisions don't have either the right orientation or enough energy for the reaction to proceed. the molecules just bounce off each other, unchanged. incidentally that is why reactions proceed faster as the temperature increases - high temperature means molecules are moving faster and are more likely to have the required energy to react.Enzymes are protein catalysts that force reactant molecules into the correct orientation and lower the required energy for a collision to produce a reaction.
What is contained in each photosynthetic unit of photosystem 1?
Photosystem I contains photosynthetic units with :- 200 or more molecules of chlorophyll a,- small amounts of chlorophyll b- protein saddled carotenoid pigment,-a pair of specialized reaction-center molecules of chlorophyll called P700
In a chemical reaction are the atoms and molecules that combine with each other to make new molecules called reactants?
Yes, a reactant is a substance that takes part in and undergoes change during a reaction. Products are those substances produced as a result of a reaction. Catalysts are substances that take part in a reaction but are left unchanged by the reaction (they speed up the reaction rate).
