Therefore the molecules are reacting. Concentration increases the number of collisions. If the solution is made more concentrated it means there are more particles of reactant knocking about between the water molecules, which makes collisions between the important particles more likely. In a gas, increasing the pressure has the same effect as it means the molecules are more squashed up together so there are going to be more collisions. If one of the reactants is a solid then breaking it up into smaller pieces will increase its surface area.
The more you have, the faster the reactions you will get. Concentration - The concentration is how strong the acid is. The stronger the acid is, the faster the reaction is, because the higher the concentration the more particles there are which mean they are more likely to collide. For any reaction that takes place particles must collide. The way all rates of reaction are increased is by an increase in the particles colliding with more energy.
[IMAGE] Faster collisions increase the rate of reaction High temperatures also increase the energy of the collision, because it makes all the particles move faster. Faster collisions are only caused by increasing the temperature. Reactions only happen if the particles collide with enough energy. At a higher temperature there will be more particles colliding with enough energy to make the reaction happen. This initial energy is known as the activation energy, and it is needed to break the initial bonds.
Higher temperature also increases the energy of the collisions, because it makes all the particles move faster. Increasing the temperature only causes faster collisions. Reactions only happen if the particles collide with enough energy. At a higher temperature there will be more particles colliding with enough energy to make the reaction happen. This initial energy is known as the activation energy, and it is needed to break the initial bonds.
There are 4 things that affect the rate of reaction, concentration, surface area, catalysts and temperature. Concentration can affect the rate of reaction by increasing atoms to collide with each other. The more atoms there are to collide, the faster the rate of reaction. In reactions where gases are involved, if you increase the pressure the particles will move closer together. The smaller the space in the container, collisions are more likely to occur.
In addition, the faster the particles are travelling, the greater proportion of them which will have the required minimum energy for reaction to occur, for example, raising the temperature of a reaction by 10°c will double the rate of the reaction. Concentration A chemical reaction will occur only if the particles of the reacting substances are allowed to come into contact. This is based on the kinetic theory: The rate of reaction would be expected to depend on the frequency with which the particles collide, which in turn will depend (among other factors) on their density, i.e. on their concentration. The more crowded the particles are, the more often we should expect them to bump into each other.
Investigating the Changes in Reaction When Sodium Thiosulphate is Added to Dilute Hydrochloric Acid Concentration Aim: To observe the changes in reaction when sodium thiosulphate is added to dilute hydrochloric acid. Prediction: I predict that the higher the concentration of hydrochloric acid is the faster the reaction will take place. Scientific knowledge: When the concentration of hydrochloric acid is high the reaction will take place faster. This is because in a high concentration of hydrochloric acid there are more particles so collisions will occur more frequently. The more collisions there are, the faster the particles will react.
The more acid you add the quicker the rate because as you increase the concentration of the acid, there are more acid particles in the same volume. Therefore there is greater chance of acid particles hitting and colliding, with particles on the surface of the marble. You have increased the rate of reaction. - Suface Area: if you are to change the surface area it is going to affect the rate. The larger the surface are then the rate will be quick, the smaller the surface area the slower the rate.
*The effect of concentration on the rate of reaction is that, if the concentration is increased, there are more particles within a given volume, therefore more collisions occur and the reaction is faster. The rate of reaction can also be defined, by using the collision theory. A collision theory explains how chemical reactions take place and why rates of reaction alter. For a reaction to occur the reactant, particles must collide. I am going to investigate how the concentration of hydrochloric acid alters the rate of reaction.
A certain amount of sodium is needed to turn the solution cloudy enough to be opaque. Increasing the concentration of a liquid increases the amount of particles; therefore there will be more successful collisions. Because of this, more sulphur will be produced. Overall, the higher the concentration, the more sulphur will be produced. Therefore, the liquid will become opaque quicker.