The differences in reactivity between reactions may be attributed to the different structures of the materials involved; for example, whether the substances are in solution or in the solid state matters.
Another factor has to do with the relative bond strengths within the molecules of the reactants. For example, a reaction between molecules with atoms that are bonded by strong covalent bonds will take place at a slower rate than would a reaction between molecules with atoms that are bonded by weak covalent bonds. This is due to the fact that it takes more energy to break the bonds of the strongly bonded molecules. Boundless vets and curates high-quality, openly licensed content from around the Internet.
This particular resource used the following sources:. Skip to main content. Chemical Kinetics. Search for:. Factors that Affect Reaction Rate. Learning Objective Explain how concentration, surface area, pressure, temperature, and the addition of catalysts affect reaction rate. Key Points When the concentrations of the reactants are raised, the reaction proceeds more quickly.
This is due to an increase in the number of molecules that have the minimum required energy. For gases, increasing pressure has the same effect as increasing concentration.
When solids and liquids react, increasing the surface area of the solid will increase the reaction rate. This is due to an increase in the number of particles that have the minimum energy required.
Enzymes are molecules that speed up all of the many chemical reactions that occur inside our body everyday. More specifically, catalysts lower the activation energy of a reaction. Lowering the activation energy makes the chemical reaction must easier and thus faster. Search Search for: Search Collision Theory Chemical reactions are all around us and they can get pretty complicated. To help us better understand scientific phenomena like chemical reactions, scientists create theories We are going to consider one of these theories called collision theory.
What are we going to learn? The two tenets of collision theory Factors that can affect the rate of a reaction Two Tenets of Collision Theory 1. Particles have to collide with enough energy in order to react. Particles have to collide with the right orientation. Factors that can Affect the Rate of a Reaction So, now that we know how to make a chemical reaction happen, how to we make the reaction faster?
Temperature Particle Size Concentration Catalyst Temperature In general, the higher the temperature of a chemical reaction, the faster the reaction. Particle Size We all know that wood burns. Catalyst A catalyst is a substance that will cause a reaction to go faster without changing into something else. Why does stirring speed up a reaction between a solid and a solution? In doing rate experiments with a solid and solution reactant e. Therefore, at the bottom of the flask the reaction prematurely slows down distorting the overall rate measurement and making the results uneven and therefore inaccurate.
The 'unevenness' of the results is even more evident by giving the reaction mixture the 'odd stir'! You get jumps in the graph!!! Stirring cannot affect a completely mixed up solution at the particle level i. How does the changing the particles size changes surface area of a solid affect the speed of a reaction?
Why does changing the particle size or surface area change the speed of a reaction? Does stirring the mixture affect the speed of a reaction? The descriptions of experiments to do with Doc Brown's Chemistry.
0コメント