How does the physical state of reactants affect the reaction rate?

How does the physical state of reactants affect the reaction rate?

The Physical States of the Reactants A chemical reaction between two or more substances requires intimate contact between the reactants. Compared with the reaction rate for large solid particles, the rate for smaller particles will be greater because the surface area in contact with the other reactant phase is greater.

What can affect rate of reaction?

We can identify five factors that affect the rates of chemical reactions: the chemical nature of the reacting substances, the state of subdivision (one large lump versus many small particles) of the reactants, the temperature of the reactants, the concentration of the reactants, and the presence of a catalyst.

What are the phases for the reactants?

The equation identifies the reactants (starting materials) and products (resulting substances), the formulas of the participants, the phases of the participants (solid, liquid, gas), the direction of the chemical reaction, and the amount of each substance.

Does the state of division of reactants affect the rate of a heterogeneous chemical reaction?

The number of collisions between reactants per unit time is substantially reduced relative to the homogeneous case, and, hence, so is the reaction rate. The reaction rate of a heterogeneous reaction depends on the surface area of the more condensed phase.

When the concentration of reactant molecules are increased the rate of reaction increases?

When the concentrations of reactant molecules are increased, the rate of reaction increases. The best explanation for this phenomenon is that as the reactant concentration increases, – the average kinetic energy of molecules increases. – the frequency of molecular collisions increases.

How does an increase in concentration of reactant increase the reaction rate?

Increasing the concentration of reactants generally increases the rate of reaction because more of the reacting molecules or ions are present to form the reaction products. When concentrations are already high, a limit is often reached where increasing the concentration has little effect on the rate of reaction.

Why it is important to write the phase next to each reactant and product?

The phase is important for chemists when planning an experiment. Knowing the phase of the product helps plan how you can collect it after the reaction. For example, an aqueous product would need to be evaporated, and a solid product would need to be filtered to help isolate it from the rest of the reaction mixture.

Is phase change a chemical reaction?

Phase changes are physical changes that take place when matter changes energy states, but chemical bonds are not broken or formed.

How does state of subdivision affect reaction rate?

The State of Subdivision of the Reactants A finely divided solid has more surface area available for reaction than does one large piece of the same substance. Thus a liquid will react more rapidly with a finely divided solid than with a large piece of the same solid.

How does it affect the factors of rate reaction to the collision?

Collision theory states that the rate of a chemical reaction is proportional to the number of collisions between reactant molecules. The more often reactant molecules collide, the more often they react with one another, and the faster the reaction rate.

Why does concentration increase the rate of reaction?

Concentration. 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 changing the reactant concentration affect the reaction rate?