Which of the following statements best describes the difference between hydrogen fuel cells and hydrogen fusion?
The correct answer is option A. “More energy is produced per reaction in a fusion reaction than in a fuel cell”.
Which statement best describes the use of catalyst in a fuel cell Brainly?
A catalyst lowers the activation energy so that molecules with low energy can easily participate in the chemical reaction and hence product formation becomes faster. Thus, we can conclude that the statement it lowers energy requirements best describes an effect of using a catalyst in an industrial process.
What overall effect does adding a catalyst?
A catalyst speeds up a chemical reaction, without being consumed by the reaction. It increases the reaction rate by lowering the activation energy for a reaction. Remember that with a catalyst, the average kinetic energy of the molecules remains the same but the required energy decreases (Figure 7.13).
Which reaction is an example of heterogeneous catalysis?
Heterogeneous and surface catalysis One example of a heterogeneous catalyst is the catalytic converter in gasoline or diesel-fueled cars. Catalytic converters contain transition metal catalysts embedded on a solid phase support.
Which of the following is the example of heterogeneous?
Mixtures in two or more phases are heterogeneous mixtures. Examples include ice cubes in a drink, sand and water, and salt and oil. The liquid that is immiscible form heterogeneous mixtures. A good example is a mixture of oil and water.
Which of the following is an example of heterogeneous substance?
Among the given examples, Candle is an example of a heterogeneous substance. Explanation: The type of mixture in which the constituent elements are different and are not uniformly distributed, it is called heterogeneous substance.
What are the four basic steps involved in heterogeneous catalysis?
Intraparticle diffusion of the reactants into the catalyst pores to the active sites. Adsorption of the reactants onto active sites. Surface reactions involving formation or conversion of various adsorbed intermediates, possibly including surface diffusion steps. Desorption of products from catalyst sites.
What are the 7 stages of heterogeneous catalysis?
1), i.e. (1) diffusion of the reactants from the bulk phase (boundary layer) to the external surface of the catalyst pellet (film diffusion or interphase diffusion), (2) diffusion of the reactant from the pore mouth through the catalyst pores to the immediate vicinity of the internal catalytic surface; the point where …
What are the most common types of heterogeneous catalysts?
The vast majority of heterogeneous catalysts are based on metals or metal oxides; however, some chemical reactions can be catalyzed by carbon-based materials, e.g., oxidative dehydrogenations or selective oxidations.
What is homogeneous catalysis with example?
A form of catalysis in which the catalyst is in the same physical state as that of the reactants in the chemical reaction is referred to as homogeneous catalysis. An example of a homogeneous catalysis is one wherein the catalyst and the reactants are in the gaseous phase. An example is acid catalysis.
What are the features of homogeneous catalysis?
Homogeneous catalyst: a catalyst in the same phase as the reaction mixture. In contrast, there are also heterogeneous catalysts: a catalyst in a different phase from the reaction mixture. The second step is the rate-determining step. Thus the production rate of O2 can be expressed by the rate of the second step.
Which one of the following is a homogeneous catalysis?
In lead chamber process, SO2 is oxidised to SO3 by the oxides of nitrogen. Hence it is homogeneous catalysis as the catalyst as well as the reactants are in gaseous.
What is the difference between homogeneous catalysis and heterogeneous catalysis?
Homogeneous catalysts are those that occupy the same phase as the reaction mixture (typically liquid or gas), while heterogeneous catalysts occupy a different phase. Generally, heterogeneous catalysts are solid compounds that are added to liquid or gas reaction mixtures.
Why are heterogeneous catalysts preferred?
Introduction. Heterogeneous catalysts play an important role in industrial chemical production. They are preferred due to their robustness and lower operational cost, in particular through easier recovery/separation from the products allowing chemical processes to be streamlined.
What is the meaning of the word homogeneous?
1 : of the same or a similar kind or nature. 2 : of uniform structure or composition throughout a culturally homogeneous neighborhood.
What is homogeneous and heterogeneous catalysis explain with example?
Homogeneous catalysis: catalysis in which the reactants and catalyst are in same phase.I.e same physical state. Example: 2SO2(g)+O2(g)→NO(gas)2SO3(g) Heterogeneous catalysis: catalysis in which the reactants and catalyst are in phases .Ie different physical states.
What is difference between homogenous and heterogenous?
By definition, a pure substance or a homogeneous mixture consists of a single phase. A heterogeneous mixture consists of two or more phases. When oil and water are combined, they do not mix evenly, but instead form two separate layers. Each of the layers is called a phase.
What is the difference between homogeneous and heterogeneous solution?
A homogenous mixture is that mixture in which the components mix with each other and its composition is uniform throughout the solution. A heterogenous mixture is that mixture in which the composition is not uniform throughout and different components are observed.