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What happens? The more finely divided the solid is, the faster the reaction happens. A powdered solid will normallyproduce a faster reaction than if the same mass is present as a single lump. The powdered solid has a greater surface area than the single lump. ---- Note: Why normally? What exceptions can there be? Imagine a case of a very fine powder reacting with a gas. If the powder was in one big heap, the gas may not be able to penetrate it. That means that its effective surface area is much the same as (or even less than) it would be if it were present in a single lump. A small heap of fine magnesium powder tends to burn rather more slowly than a strip of magnesium ribbon, for example.
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Some examples Calcium carbonate and hydrochloric acid In the lab, powdered calcium carbonate reacts much faster with dilute hydrochloric acid than if the same mass was present as lumps of marble or limestone. The catalytic decomposition of hydrogen peroxide This is another familiar lab reaction. Solid manganese(IV) oxide is often used as the catalyst. Oxygen is given off much faster if the catalyst is present as a powder than as the same mass of granules. Catalytic converters Catalytic converters use metals like platinum, palladium and rhodium to convert poisonous compounds in vehicle exhausts into less harmful things. For example, a reaction which removes both carbon monoxide and an oxide of nitrogen is: Because the exhaust gases are only in contact with the catalyst for a very short time, the reactions have to be very fast. The extremely expensive metals used as the catalyst are coated as a very thin layer onto a ceramic honeycomb structure to maximise the surface area. The explanation You are only going to get a reaction if the particles in the gas or liquid collide with the particles in the solid. Increasing the surface area of the solid increases the chances of collision taking place. Imagine a reaction between magnesium metal and a dilute acid like hydrochloric acid. The reaction involves collision between magnesium atoms and hydrogen ions. Increasing the number of collisions per second increases the rate of reaction.
What else can I help you with?
Where surface area is not affect the rate of a reaction?
Surface area affect the reaction rate because the contact between finely divided particles is improved.
What is a change that affects chemical reaction rate?
Factors affecting the reaction rate:- Concentrations of the reactants- Temperature- Pressure- Sirring- Catalysts- Granulometry (and the surface area) of the reactants- Reaction order- Type of the reaction- The solvent used- External factors as irradiationetc.
As the surface area of the Zn(s) used in the reaction Zn(s) + 2HCl(aq)--> ZnCl2(aq) + H2(g) is increased, the rate of the reaction willIncreaseDecreaseRemain the Same?
An increase in surface area means an increase in the rate of reaction.
Can you change the rate of a chemical reaction by changing the particle size?
In hetrogeneous reactions (where the reactants are in different states) the size of the particles of a solid may change reaction rate, since the surface is where the reaction takes place, and the surface area is increased when the particles are more finely divided. In general, the smaller the particles the faster the reaction
What causes reaction rate to change?
Reaction rate can change due to factors such as temperature, concentration of reactants, presence of catalysts, and surface area of reactants. Increasing temperature generally increases reaction rate by providing more energy for molecular collisions, while higher reactant concentrations and larger surface areas promote more frequent collisions between reactant molecules. Catalysts can also lower activation energy and increase reaction rate by providing an alternative pathway for the reaction to proceed.
What is the effect of reactant surface area on the reaction rate?
surface area has simple constant factor with the rate of reaction. Rate = (surface area)[concentrations with coefficients] the greater the surface area the greater the rate of reaction in a simple constant multiple.
Where surface area is not affect the rate of a reaction?
Surface area affect the reaction rate because the contact between finely divided particles is improved.
What is a change that affects chemical reaction rate?
Factors affecting the reaction rate:- Concentrations of the reactants- Temperature- Pressure- Sirring- Catalysts- Granulometry (and the surface area) of the reactants- Reaction order- Type of the reaction- The solvent used- External factors as irradiationetc.
As the surface area of the Zn(s) used in the reaction Zn(s) + 2HCl(aq)--> ZnCl2(aq) + H2(g) is increased, the rate of the reaction willIncreaseDecreaseRemain the Same?
An increase in surface area means an increase in the rate of reaction.
Relationship between surface area and rate of reaction?
The surface area directly impacts the rate of reaction. Increasing the surface area of reactants leads to more exposed particles available for collisions and interactions, which can increase the rate of reaction. This is because a larger surface area provides more opportunities for effective collisions to occur, leading to a faster reaction rate.
Can you change the rate of a chemical reaction by changing the particle size?
In hetrogeneous reactions (where the reactants are in different states) the size of the particles of a solid may change reaction rate, since the surface is where the reaction takes place, and the surface area is increased when the particles are more finely divided. In general, the smaller the particles the faster the reaction
Does the rate of reaction equal surface area over volume?
No. There is no one single expression for the rate of a chemical reaction. It depends on many factors. It is true, however, that the greater the surface area, the greater would be the rate of reaction, but it isn't EQUAL to SA/Volume.
What is the relationship between surface area and rate of reaction?
The increase in surface area of reactants increases the contact between reacting molecules, atoms or ions so the rate of reaction becomes increased.
What are Ways to change the rate of a chemical reaction?
1. Increase the temp 2. Increase surface area 3. Increase the pressure of the system
What effects the rate of a chemical reaction?
Temperature, pressure, catalyst, surface area
How is surface area related to the rate at which a solid dissolves?
more surface area means more contact with liquid higher reaction rate thus it will be easily dissolved
What causes reaction rate to change?
Reaction rate can change due to factors such as temperature, concentration of reactants, presence of catalysts, and surface area of reactants. Increasing temperature generally increases reaction rate by providing more energy for molecular collisions, while higher reactant concentrations and larger surface areas promote more frequent collisions between reactant molecules. Catalysts can also lower activation energy and increase reaction rate by providing an alternative pathway for the reaction to proceed.
