The Effect of Concentration on the Rate of Reaction
Aim: We are going to investigate how change in the concentration of
acid affects the rate of reaction.
Introduction:
Chemical Reactions are caused when the particles collide with each
other to react. This is known as collision theory. Particles need
enough energy to make a successful reaction. This is called activation
energy when the minimum amount of energy is present a reaction
happens. The formula for the collision theory is ½ mv2.. Altering the
following factors can increase the rate of reaction:
Sizes of chips - Varying the size of chips will have an effect on the
results ie the smaller the chips the less of a successful reaction
takes places.
Temperature - If the temperature is increased, the particles gain more
kinetic energy, meaning they move further and faster. This means that
collisions are more likely to happen, and will happen with more force,
therefore speeding up the reaction time.
Increasing the pressure in a gas - If the amount of particles is
increased in the same volume of gas, the particles are more likely to
collide therefore increasing the rate of reaction.
Increasing the surface area - If the surface area of the reacting
particles is increased i.e. using powder instead of a block, there are
more particles available for reaction. This means that reactions are
more likely, therefore speeding up the rate of reaction.
Using a suitable catalyst - A catalyst is a substance that speeds up a
reaction but is not used up itself. When added to a reaction, some
catalysts provide a surface for particles to stick to, making them
more likely to collide with other particles. Others provide a lower
energy pathway meaning that particles do not have to collide with each
other so violently in order to react.
Prediction: I think that increasing the concentration of the acid in
this experiment will speed up the rate of reaction, as there will be
more particles in the same space, meaning they are closer together and
CL-, as the ions of H+ and OH- react to form H2O. These spectator ions
In a substance the rate of reaction will be quicker if it has a large
It is important however to note that the NH4 and K ions are still in
The Effect of Changing the Concentration of the Enzyme Catalyst on the Rate of Reaction on Hydrogen Peroxide
Investigating the Effect of Concentration on the Rate of Diffusion Aim: To find out if concentration affects the rate of diffusion. Prediction: I predict that the higher the concentration of acid the faster the reaction will be. Hypothesis: Diffusion is the spreading out of a gas or liquid from an area of low concentration to another area where it has a lower concentration until the overall concentrations are balanced. The Hydrochloric acid (HCl) diffuses into the gelatine cube of which contains Sodium Hydroxide (NaOH), which is an alkali. When the Hydrochloric acid combines with the Sodium Hydroxide they form salt and water, which is neutral therefore turning the pink cube to clear.
In this experiment there five different phases and in each a different factor of the Collision Theory was tested. The first phase was called, Nature of the Reactants and it had three parts to it. In the first part of it which was steps 1-4, 5 pieces of mossy zinc were put into 3ml of 2M H_2 〖SO〗_4 and during this time bubbles were produced. After a few minutes the zinc was removed from the acid and it was now clean zinc.
has a lower energy state. It will now tend to remain the way it is.
have decided what size chips I I'm going to use I will keep the same
every size of chip. By doing this I will find out if the rate of
could use 2 chips in one experiment and get 1g then we could use 4
How does concentration affect the rate of reaction between magnesium and sodium? and hydrochloric acid. Secondary resources:.. Chemical reactions only occur when reacting particles collide with each other, with sufficient energy to react, this is called the collision theory. The minimum amount of energy required to cause this.
The Effect of Concentration of Acid on the Rate of Reaction With Calcium Carbonate Calcium + Hydrochloric ð Calcium + Carbon + Water Carbonate Acid Chloride Dioxide CaCO3 (s) + 2HCl (aq) ð CaCl2 (aq) + CO2 (g) + H2O (l) Introduction I will be using the reaction between calcium carbonate and hydrochloric acid to see how the concentration of acid affects the rate of a reaction. By doing the above experiment I will prove that the higher the concentration of acid, the faster a reaction will occur. I have carried out a previous experiment called the 'Disappearing Cross', in which I used the reaction between thiosulphate, hydrochloric acid and water to see how concentration affects the rate of reaction. When we added the hydrochloric acid to the water and thiosulphate a reaction occurred, causing the water to become foggy so that the cross was no longer visible through the conical flask. The results for the Disappearing Cross experiment were as follows; Volume of Thiosulphate (Cm3) Volume of Water (Cm3) Volume of HCl (Cm3) Concentration (%) Time taken for X to disappear (seconds) 5 25 5 17 711 10 20 5 33 286 15 15 5 50 185 20 10 5 67 113 25 5 5 83 82 You can see that when the hydrochloric acid was most dilute the cross took 711 seconds to disappear, and when the acid was most concentrated the cross took just 82 seconds to disappear.
The Effects of Concentration on Reaction Rate with Sodium Thiosulphate ---------------------------------------------------------------------- Planning = == == =
How Amylase Concentration Affects the Rate of the Starch Concentration In this piece of coursework, I have to carry out an investigation to find out how amylase concentration affects the rate of starch. Enzymes are biological catalysts that speed up the chemical reaction that goes on inside living things. An enzyme acts on substrate and may do its job inside or outside the cells. However, the rate at which enzymes work are affected by the following factors/variables: Concentration:
Concentration's Effect on the Speed of Reaction Between Magnesium and Hydrochloric Acid Planning 1: The aim of this investigation is to find out the effect of acid concentration in the reaction between dilute hydrochloric acid and magnesium ribbon. The rate of a chemical reaction is a measure of how fast the reaction takes place. A high concentration of hydrochloric acid could mean a fast reaction whereas as a low concentration could mean a slow long reaction. I will be testing different concentrations of acid reacting with magnesium in two separate experiments, which will hopefully prove this initial prediction. [IMAGE][IMAGE] During my science lesson I have learnt the following information that has enabled me to plan my investigation.