Why does the rate of reaction increase when powdered calcium carbonate is used instead of marble chips?

It is faster when powder is used, because the surface area of the powder is greater. Because there is more surface area, there is more surface (exposed calcium carbonate particles) with which the HCl particles can collide.

Why does powder have more surface area?

Surface area is larger when a given amount of a solid is present as smaller particles. A powdered reactant has a greater surface area than the same reactant as a solid chunk. In order to increase the surface area of a substance, it may be ground into smaller particles or dissolved into a liquid.

How does the particle size affect the rate of reaction?

Surface Area / Particle Size Breaking the reactant into smaller pieces increases the surface and more particles are exposed to the reaction mixture. This results in an increased frequency of collisions and therefore a faster rate of reaction.

Why do we grind the crystals to a fine powder?

The process of assaying ore samples for mineral content usually requires that stone be ground down to a fine powder. Other reasons for grinding it might also include the production of ingredients for chemicals, dyes or building materials.

Why does a higher concentration increase the rate of reaction?

If the concentration of reactants is increased, there are more reactant particles moving together. There will be more collisions and so the reaction rate is increased. The higher the concentration of reactants, the faster the rate of a reaction will be.

Why does increased concentration increase reaction rate?

For a chemical reaction to occur, there must be a certain number of molecules with energies equal to or greater than the activation energy. With an increase in concentration, the number of molecules with the minimum required energy will increase, and therefore the rate of the reaction will increase.

Why are powders more reactive?

The more finely divided the solid is, the faster the reaction happens. A powdered solid will normally produce 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.

Why do higher concentrations have faster reactions?

Increasing the concentration of one or more reactants will often increase the rate of reaction. This occurs because a higher concentration of a reactant will lead to more collisions of that reactant in a specific time period.

Why does decreasing particle size increases speed reaction?

A decrease in particle size causes an increase in the solid’s total surface area. Raising the reaction temperature by 10 °C can double or triple the reaction rate. This is due to an increase in the number of particles that have the minimum energy required.

Why does powder react faster than lumps?

A powdered solid will normally produce 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.

Which reaction is faster Why?

Reactions in phases that easily mix, such as gases and liquids, occur much faster than reactions between solids. The extent of mixing of the reactants influences the frequency of molecular collisions – if reactants are more thoroughly mixed, the molecules will collide more often and thus react faster.

Why do pure powders react faster than blocks?

Powders react faster than blocks – greater surface area and since the reaction occurs at the surface we get a faster rate. The presence (and concentration/physical form) of a catalyst (or inhibitor). A catalyst speeds up a reaction, an inhibitor slows it down.

Why does the rate of reaction increase in powder form?

This is due to the metal in the powder form having a larger surface area. There are 4 ways to increase the rate of reaction. Increasing the concentration of the reactants, increasing the temperature, adding a catalyst or increasing the surface area of the reactants.

How does the size of a solid affect the reaction rate?

In chemical reactions that include a solid as one of the reactants, you can actually change the reaction rate by varying the size of the solid that reacts with the liquid or the gas. How does this work? For a chemical reaction to happen, the molecules or atoms of the reactants need to collide with each other.

Why is the surface area of acids greater in powder than strips?

The surface area is larger in powder form than in strips as the metal pieces are smaller, therefore there are more of them thus increasing the surface area. The larger the surface area, the more metal is exposed to the acid therefore increasing the rate of reaction. Need help with Chemistry?