What three factors can affect diffusion rate?
Concentration gradient, size of the particles that are diffusing, and temperature of the system affect the rate of diffusion.
What factors can increase the rate of diffusion?
As with any chemical reaction, increasing the temperature or pressure increases the kinetic energy of the particles, thus increasing the rate of diffusion. Concentration Gradient: The greater the concentration gradient (the difference in concentration either side of the membrane) the greater the rate of diffusion.
How does temperature affect the rate of diffusion experiment?
When temperature increases, the kinetic energy of the particles has increased. Therefore, at higher temperatures, the rate at which fluid particles will diffuse is faster than at lower temperatures. In the experiment, the food coloring will diffuse faster in the hot water than in the cold water.
How does size affect the rate of diffusion?
When the cell increases in size, the volume increases faster than the surface area, because volume is cubed where surface area is squared. When there is more volume and less surface area, diffusion takes longer and is less effective. this is actually why cells divide.
What factors affect the rate of reaction?
Reactant concentration, the physical state of the reactants, and surface area, temperature, and the presence of a catalyst are the four main factors that affect reaction rate.
What are 5 factors that affect reaction rate?
Five factors typically affecting the rates of chemical reactions will be explored in this section: 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 …
Which does not affect the rate of reaction?
Physical state of the reactant.
Which factor decreases the rate of a chemical reaction?
In general, a factor that increases the number of collisions between particles will increase the reaction rate and a factor that decreases the number of collisions between particles will decrease the chemical reaction rate.
What is rate of reaction write two factors that affect the rate of reaction?
Answer. 1)concentration of reactants. 2)temperature.
Which will increase the rate of a chemical reaction quizlet?
Describe three ways to increase the rate of a chemical reaction. increase temperature by adding heat, increases the surface area of the reactants, increase the concentration of the reactants, or add a catalyst.
Which factor will affect the rate of reaction only when gases are involved?
Reactions occur when two reactant molecules effectively collide, each having minimum energy and correct orientation. Reactant concentration, the physical state of the reactants, and surface area, temperature, and the presence of a catalyst are the four main factors that affect reaction rate.
What are four factors that affect the rate of a chemical reaction quizlet?
Terms in this set (20)
- Nature of Reactants.
- Surface Area (more = faster)
- Temperature (higher = faster)
- Concentration (larger = faster)
- Catalyst (present = faster)
Does diluting a solution increase or decrease the rate of reaction?
The more the solution of a reactant is diluted, the slower the reaction will occur.
What will cause an increase in the reaction rate between molecules?
Which will cause an increase in the reaction rate between molecules? Molecules have strong internal bonding. Molecules collide more frequently. Electrons in the bonds remain in a meta-stable state.
Do enzymes speed up reactions?
Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy.
Why does temperature increase rate constant?
Increasing the temperature of a reaction generally speeds up the process (increases the rate) because the rate constant increases according to the Arrhenius Equation. As T increases, the value of the exponential part of the equation becomes less negative thus increasing the value of k.
Does rate constant depend on temperature?
An increase in temperature increases the rate constant and hence the rate. An increase in concentration increases the rate but not the rate constant. Temperature affects k and k affects R so, temperature affects both while concentration affects only Rate of reactions.
Does equilibrium constant depend on temperature?
Increasing the temperature decreases the value of the equilibrium constant. Where the forward reaction is endothermic, increasing the temperature increases the value of the equilibrium constant. The position of equilibrium also changes if you change the temperature.
Does rate constant depend on catalyst?
These are all included in the so-called rate constant (k)- which is only actually constant if all you are changing is the concentration of the reactants. If you change the temperature or the catalyst, for example, the rate constant changes. This is shown mathematically in the Arrhenius equation.
Why does KC only change with temperature?
The only thing that changes an equilibrium constant is a change of temperature. That means that if you increase the pressure, the position of equilibrium will move in such a way as to decrease the pressure again – if that is possible. It can do this by favouring the reaction which produces the fewer molecules.
Why is KC affected by temperature?
According to Le Chatelier’s Principle, an increase in temperature will move the reaction to the left, increasing the concentration of the reactants A and B and decreasing the concentration of the product C. The total changes in the concentrations of A, B and C result in an unchanged value of Kc.
Why is equilibrium constant not affected by pressure?
of moles of gaseous species are same on both sides so, change in pressure do not affect the equilibrium of the reaction. However, the equilibrium constants of all reactions are unaffected by change in pressure because it depend on temperature only.