what is rate of reaction?what are the factors affecting it?

Answer 1

it is the time a reaction takes to completely change the reactants into products
factors effecting it -conc. of reactants or products, surface area, temperature etc

Answer 2

The reaction rate for a reactant or product in a particular reaction is defined as the amount of the chemical that is formed or removed (in moles or mass units) per unit time per unit volume. Knowledge of these rates is essential in, among other disciplines, chemical engineering and environmental engineering. Chemical kinetics is the part of physical chemistry which studies reaction rates.


Factors influencing rate of reaction
There are several factors that affect the rate of reaction:

Temperature: Conducting a reaction at a higher temperature puts more energy into the system and increases the reaction rate. The influence of temperature is described by the Arrhenius equation, whose result is factored into the equation by k. As a rule of thumb, the reaction rate doubles for every 10 degrees Celsius increase in temperature. However, if a reaction is exothermic a rise in temperature can slow the rate of reaction.
Concentration: As reactant concentration increases, the frequency of collision increases and so therefore does the frequency of collisions having sufficient energy to cause reaction.
Pressure: The rate of gaseous reactions usually increases with an increase in pressure. Increase in pressure in fact is equivalent to an increase in concentration of the gas.
Light: Light is a form of energy. It may affect the rate or even course of a reaction. For example when methane reacts with chlorine in the dark, the reaction rate is very low. It can be sped up when the mixture is put under diffused light. In bright sunlight, the reaction is explosive.
Order: The order of the reaction has a major effect on its rate. The order of a reaction is found experimentally, and, for most basic reactions, is an integer value.
A catalyst: The presence of a catalyst increases the reaction rate in both the forward and reverse reactions by providing an alternative pathway with a lower activation energy.
The nature of the reactants: If a reaction involves the breaking and reforming of bonds (complex) compared to just the forming of bonds (simple) then it generally takes longer. The reactants position in the reactivity series also affects reaction rate.
Surface Area: In reactions on surfaces, which take place during heterogeneous catalysis, the rate of reaction increases as the surface area does. The larger the surface area compared to the volume, the faster a reaction can take place, as more simultaneous reactions can occur.

Answer 3

Rate of reaction is the change in the concentration of the reactants over time.

A number of factors can affect reaction rate. The temperature of the system affects the speed of the molecules, such that more collisions occur and more of those collisions lead to reactions. The presence of a catalyst can change the pathway of the reaction. The physical state of the reactants plays a role, as gasses or ions in solution will react much faster than solids. The concentration of the reactants plays a role as well, as the higher the concentration, the more frequent the collisions.

Answer 4

The rate of reaction describes how fast reactants form products in a chemical reaction. Chemical reactions can be sped up or slowed down by altering the surface area, concentration, and temperature of the reactants. In this hands-on activity, students actually alter these factors and observe how they affect the rate of reaction.

Answer 5

The rate of a chemical reaction is the speed at which reactants are converted to products.

surface area, nature of the reactants, concentration, temperature, and catalysts are a factors that affect rate of reaction

Answer 6

the rate of chemical reaction at an instant is the decrease in the concentration of reactants or increase in the concentration of products in unit time,during process of reaction.
the factors affecting are:
1)the chemical nature of reactants
2)the concentration of reactants
3)the temperature of reaction
4)the catalyst used in the reaction.

Answer 7

The rate of reaction is defined as the rate of decrease of concentration of a reactant, or the rate of increase of concentration of a product, and is always given as a positive number.
OR
Reaction rate is defined as the rate of change of concentration of a particular reactant or product.

Factors:
1.effect of concentration
2.effect of temperature- increasing the temperature increases the rate of chemical reactions.
3.effect of catalysts- catalysts r substances which alter the rate of chemical reactions without undergoing any overall chemicl change themselves.
4.effect of light- eg. Photosynthesis and photography.

Answer 8

The change in concentration of reactants or products for a specific period of time is called rate of reaction.

Heat
light
pressure
are the factors

Answer 9

if this q is regarding VCE chem unit 3 (which was last semester) the factors are, surface area, number (concentration) of reactants , emperature, and pressure/volume.

Answer 10

Factors should include Heat (temerpature and kinetic energy) Concentration and if it involves gases, pressure could be taken in to account