Rate of Reaction with Sodium Thiosulphate
COLLISION THEORY
The Collision theory of Reaction Rates is said by some to be one of
the most stable in the Physical Sciences. The theory states that in
order for a successful reaction to take place there must be
'effective' collisions between the reactant molecules. Simply having
reactant molecules colliding is necessary but not sufficient in
itself. The collisions have to be effective.
Collision theory explains this reaction, in a concentrated solution
there are more of the reacting particles present, this means that
there is a greater chance of collision therefore a greater chance of
reactions. In a diluted solution there are less particles present so
the chance of a collision becomes less probable this means that there
are less reactions.
What constitutes an effective collision?
In order for a molecular collision to be effective it must meet two
conditions:
þ The collision must have sufficient enough impact energy to overcome
the Activation Energy. The Activation energy is the minimum energy
necessary for product to form.
This impact energy must be sufficient so that bonds can be broken
within the reactant molecules and new bonds formed to produce the
products.
þ The molecules must have a proper positioning for effective
collisions to occur.
CONCENTRATION
Concentration means that there is a lot of the substance present. In a
concentrated solution there is a lot of the reacting particles
present, and if there is a low concentrated substance then there is
less reacting particles present. It is important to consistently keep
the amounts of the reactants are constant in any experiment because,
as the reactant is used up the reaction slows down. This means that if
a large amount of solid is used the rates of the reaction will
differentiate itself from the same experiment that uses a smaller
amount of solid. If we increase the concentration, we are, in essence,
increasing the total number of collisions. This ,in turn, will
increase the number of effective collisions, and the rate will
If the relative amount of reactants is altered, then the limiting reactant may change accordingly. For example, a balanced chemical equation of a certain reaction specifies that an equal number of moles of two substances A and B is required. If there are more moles of B than of A, then A is the limiting reactant because it is completely consumed when the reaction stops and there is an excess of B left over. Increasing the amount of A until there are more moles of A than of B, however, will cause B to become the limiting reactant because the complete consumption of B, not A, forces the reaction to cease.
This means that there are more collisions between the solid and liquid. Amount of tap water H2O used, i.e. volume (in ml) of the syringe. Amount of Alka-Seltzer tablets used, i.e. quantity of the tablets. one is used for the. Number of times the solution is stirred.
How am I going to make it a fair test I will use a clean flask for
Hydrochloric Acid, Sodium Thiosulphate Reaction. Research: What is the difference between Hydrochloric acid is a strong colourless acid formed when hydrogen chloride gas dissociates in water, used in industrial and laboratory. processes. The.
to be done. This was to find out what amount of each liquid would be
Investigating the Factors Influencing the Rate of Reaction Between Sodium Thiosulphate and Dilute Hydrochloric Acid
The Effect of Temperature on the Rate of Reaction Between Sodium Thiosulphate and Hydrochloric Acid
Some collisions are successful and give a product while others don't. because particles don't have enough energy. Activation energy - The amount of energy needed for the reaction to be. started. I am a naysayer.
This meeting between the two particles can only take place on the surface area of the material. If the surface area of the material is increased, the particles gather more space to collide with each other with force. With a large surface area, the particles will have more area to work on so the collision probability will be high. A catalyst is a separate substance to the ones you use in your experiment and is used to speed up the reaction between the reactants.
If a reactant is a solid, then breaking it up into smaller pieces (but keeping the mass the same) will increase its surface area. If there is a larger surface area the reacting particles will have more of an area to react with, therefore there will be more collisions. 4. A catalyst works by giving the reacting particles something to stick to where they can collide with each other, because they are all attracted to the catalyst there are going to be more collisions. A catalyst does not get used up in a reaction.
from 10cm to 50cm to make it easier to see the difference in a graph.
deal of energy is required, most of which appeared as heat in the target. As a
Reactions occur when the particles of reactants collide together continuously. If they collide with sufficient energy, then they will react. The minimum amount of kinetic energy required for particles at the time of collision is called the activation energy and this theory is known as the ?collision theory?.
Because there are more molecules, the frequency of successful collisions is greater, and the reactions happen faster. Safety There are a lot of safety issues we must abide by in this experiment. We must remember that the substances we use in this experiment can be very harmful if used the wrong way. When doing this experiment, it may be necessary to wear safety goggles, as things are very unpredictable, and even though it is very unlikely that the solution will come out of the beaker during the experiment, one must still be cautious of spills. We must make sure that coats and bags are all out of the way while doing the experiment.
The rate of reaction is how quickly or slowly reactants in chemical reactants turn into products. A low reaction rate is when the reaction takes a long time to take place; hence, a reaction that occurs quickly has a high reaction rate. A rate refers to how slow or quick the product is produced. It is possible to control the rate of chemical reactions and speed up or slow down the rate of chemical reactions by altering three main factors which are temperature, concentration and the surface area. When the temperature of the reactants increases, the molecules vibrate at a more intense speed therefore colliding with each other more frequently and with increased energy resulting in a greater rate of reaction. Accordingly, as the temperature decreases the molecules will move slower, colliding less frequently and with decreased energy resulting in the rate of reaction decreasing. Concentration is how much solute is dissolved into a solution and is also a factor that affects the rate of reaction. When the concentration is greater this means there is an increased amount of reactant atoms and molecules resulting in a higher chance that collisions between molecules will occur. A higher collision rate means a higher reaction rate. Consequently at lower concentrations there are reduced chances of the molecules colliding resulting in a lower reaction rate. The measurement of how much an area of a solid is exposed is called the surface area. The quicker a reaction will occur the more finely divided the solid is. For example, a powdered solid will usually have a greater rate of reaction in comparison to a solid lump that contains the same mass for it has a lower surface area than the powdered solid.