The Effect of Concentration on the Rate of Reaction Planning AIM To look at the change in concentration on the rate of reaction BACKGROUND THEORY The rate of reaction tells us how quickly a chemical reaction happens. We can work it out after doing an experiment. We can measure how much reactant is used up in a certain time or how quickly products are formed. We then work out what 1/time taken is and that gives us the rate. The rate of the reaction can be affected by a number of things: Concentration Surface area Temperature Catalysts The collision theory The greater the surface area, the faster the rate of reaction. This is because more atoms are exposed and ready to react. The higher the temperature, the faster the rate of reaction. This is because raising the temperature makes the particles collide more often in a certain time and it makes it more likely that collisions will result in a reaction. Catalysts speed up chemical reactions therefore increase the rate of reaction. The collision theory is that the more collisions between particles in a given time, the faster the reaction. This goes for all of the above factors and is the basis for why reactions take place. PRELIMINARY WORK For our preliminary work, we decided the factor we were going to investigate was how concentration affects the rate of reaction. We used sodium thiosulphate (Na2 S2 O3) as our concentrated solution, hydrochloric acid and water to carry out our experiment. We did the experiment with two concentrations of sodium thiosulphate, 40gpl and 25gpl, to see which we would use for our main investigation. On a two pieces of paper, we drew a cross and place a beaker on top of the crosses. Into the beakers we poured 25cm3 sodium thiosulphate, the 40gpl solution in one and the 25gpl solution in the other. To each of the solutions we added 5cm3 of hydrochloric acid and started timing.
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.
has a lower energy state. It will now tend to remain the way it is.
The Effect of Concentration of Hydrochloric Acid on the Rate of Reaction with Magnesium Aim: To investigate the effect of concentration of hydrochloric acid on the rate of reaction with magnesium Prediction: As the concentration of the hydrochloric acid increases, so will the rate of reaction Hypothesis: In a reaction, particles of two different reactants react together to form a product. The reaction only takes place on account of two things, if the particles collide, and if the collision has enough 'activation energy'. The two reactant particles, in this case magnesium particles and hydrochloric acid particles, must collide with each other on the correct 'collision course'. If this does not occur then no chemical reaction will take place. The reaction must also have enough energy, this can be affected by temperature, the more heat the particles have the faster they move and so the more energy therefore more chance of successful collisions.
Investigation: How does the concentration of acid affect the rate of reaction? The aim of this investigation is to test how concentration affects the rate of reaction. My prediction for my investigation is that the higher the concentration, the faster the reaction will be.
The Effect of Temperature on the Rate of a Reaction Aim and Hypothesis The investigation that we have chosen to do is how the effect of temperature affects the rate of reaction of hydrogen peroxide to water and oxygen using the enzyme catalase. I predict that the higher the temperature the faster the rate of reaction will be and the more oxygen there will be given off. I've based this prediction on kinetic theory (every 10 degree rise in temperature the rate of reaction doubles.) This is because the substrate will lock on twice as fast, as it is travelling twice as fast.
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.
Investigating Factors that Affect the Rate of Reaction There are certain factors which affect the rates of reaction in an experiment. These factors are: · Pressure · Temperature · Concentration * Surface area / particle size and * The addition of a catalyst The factors that I will be concentrating on are temperature, concentration and surface area / particle size. Pressure Pressure influences the rate of reaction only when the reactants are in their gas phase. Pressure does not affect them much when they are either solids or liquids.
The aim of this experiment is to find out how the area of the cross
The Effect of Temperature on the Rate of a Chemical Reaction Aim: In this investigation we are trying to find out how the temperature affects the rate of reaction. Hypothesis: I believe that the higher the temperature, the faster the reaction the reaction between the sodium thiosulphate and hydrochloric acid. This will happen because kinetic energy and the heat energy makes the particles move faster, collide faster and react faster; therefore they can break bonds easier. Scientific Knowledge: Firstly, I will explain the equation needed to follow out the experiment: [IMAGE]Na2 S2O 3(aq) + 2HCL(aq) 2NaCl(aq) +SO2 (g)+ H2O (l)+S(s)
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:
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.