0
Does a catalyst always increase the rate of reaction or it may decrease it also?
Wiki User
∙ 13y ago
Yes, but those 'negative' catalysts are different compounds then the positives (=increasing rate). They are not that useful, so rather seldom used.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
will a catalyst change the enthalpy of a reaction in a chemical reaction?
No, a catalyst will not change reaction enthalpy. If it does so, then it is NOT a catalyst but a reactant in stead!
What happens to a catalyst after a reaction?
In any reaction, a catalyst is never used up or changed. This means that at the end of every reaction you should always get your catalyst back. sometimes in the course of the reaction, the catalyst is used up, but by the end of the reaction it will always be reformed completely.
What are the similarities and difference between enzymes and chemical catalyst?
so the similarity is that they both speed up the reaction and both have special temperatures they best work at the only difference between them is that enzymes are found in humans and are not made by humans on particular purpose,whereas chemical catalysts are made by people and are not naturaly developed
How is a catalyst represented in a chemical reaction?
You mean in a chemical equation? There it is always written over the arrow. Like so: .........electricity 2H2O------------>H2+O2
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 a catalyst change the enthalpy of a reaction in a chemical reaction?
No, a catalyst will not change reaction enthalpy. If it does so, then it is NOT a catalyst but a reactant in stead!
What would speed up a reaction?
increasing the concentration of reactants
What happens to a catalyst after a reaction?
In any reaction, a catalyst is never used up or changed. This means that at the end of every reaction you should always get your catalyst back. sometimes in the course of the reaction, the catalyst is used up, but by the end of the reaction it will always be reformed completely.
What are the similarities and difference between enzymes and chemical catalyst?
so the similarity is that they both speed up the reaction and both have special temperatures they best work at the only difference between them is that enzymes are found in humans and are not made by humans on particular purpose,whereas chemical catalysts are made by people and are not naturaly developed
How is a catalyst represented in a chemical reaction?
You mean in a chemical equation? There it is always written over the arrow. Like so: .........electricity 2H2O------------>H2+O2
A short circuits in any system are always accompanied by a sudded?
current decrease
How does a catalyst change the rate of a chemical reaction?
Lowers the activation energy of a reaction, therefore speeding the reaction up.Catalysts speed up chemical reactions. They do not change the products or reactants of the reaction, and are not used up or consumed in the reaction. Biological catalysts are called enzymes. Catalysts lower the activation energy (or energy needed to start a reaction), and cause the reaction to occur more quickly.
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.
In a geometric sequence where r and gt 1 the terms always increase.?
No, they do not. If the first term is negative, they always decrease.
What other two ways of increasing rates of reaction?
There are 4 ways to speed up rate of reactionTemperature - if you increase this then ther will be more molecules with sufficient energy to reach 'over' the activation energy barrierConcentration - there are more molecules, so more collisionsCatalyst (or enzyme in bio-organic reactions) - this is a substance that speeds up the rate of reaction as it lowers the activation energy reaction 'barrier', meaning more collisions will be succesfulSurface Area - if one of the reactants is a solid then breaking it up it into smaller pieces will increase surface area at which more molecules can collide to react.It's all based on the collision theory.
Chemical reactions always involve changes in a chemical?
There will always be changes in one of the reactants. In some chemical reactions, one of the chemicals works as a catalyst to encourage a reaction between two or more chemicals but does not change during the reaction.
How can the speed of a chemical reaction be increased?
The rate of chemical reaction can be increased by following ways:- 1. Adding a catalyst. 2. Increasing the temperature of system. 3. Increasing the surface area. 4. Increasing the stirring/mixing rate 5. Increasing the pressure of system (but take care as this is not always the case)
