• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11

Rates of Reaction

Extracts from this document...

Introduction

THE RATES OF REACTION AIM Since my project is to investigate the rates of reaction, my aim is to test how one factor will affect the rate of reaction. BACKGROUND KNOWLEDGE The rate of reaction tells us how quickly a reaction takes place. The only real way to measure the rate of reaction is by implementing experiments. Usually the rate of reaction will vary if one factor variable has less or more volume. These are usually the variables that can affect the rate of reaction: - * Catalyst * Concentration on the reactants * Surface Area * Temperature These factors are variables, which if changed; it will affect the rate of the reaction. Catalyst A catalyst is a substance which speeds up a chemical reaction, leaving the catalyst unchanged after the reaction has taken place. Catalyst provides an alternative pathway for the reaction e.g. a catalyst that has much lower activation energy. More collisions will therefore have enough energy for this new pathway. Catalysts are important in many industrial processes. They increase the rate of production. Example of a catalyst is Iron which is used in the Haber process to process ammonia. Concentration of the reactants The concentration of the reactants will also affect the rate of reaction. For example, if we increased the concentration of a reactant in a reaction, it would mean that the number of collisions between particles will be higher. Higher concentration of molecules means there will be more collisions taking place there fore increasing the rate of reaction. ...read more.

Middle

I used this to heat the test tube properly, as it is safer to use than a Bunsen burner. It is also to an advantage because it keeps the water the same temperature. It is also capable of rising the water temperature to as much as 90�C. * Test tube This was required to contain the acid and also, it was feasible enough to use as we could fit the end of the barometer into the tube. * Barometer We used this piece of apparatus to collect the gas and keep a track of how much gas is being collected. * Measuring Cylinder This was needed to measure the volume of acid, we first collected the acid up to 10ml in the measuring cylinder and until we obtained the required amount we poured it into the test tube. * Clamp stand This was needed to hold the barometer. * Stopwatch We used this piece of apparatus to record how long it took from the time the magnesium entered the test tube containing the 10ml of acid until the barometer contained exactly 50ml of gas given off from the reaction. * Weighing scale We used a weighing scale to weigh the amount of magnesium. It was a small scale and measured quite accurately. The apparatus is illustrated on the next page. METHOD & FAIR TEST Basically my method was described in the planning area. Most of the equipment for my experiment will be obtained from the school and the prep room. ...read more.

Conclusion

These were at 20�C where the time taken was 6.65 seconds and at 50�C where the time taken was 6.32 seconds. So clearly, the time taken at 40�C should be somewhere between 6.65 and 6.32 seconds. I think we have this irregular result because I found there was a problem with one of the gas syringes. I remember that one of them had a bit of moisture in the syringe, which made the plunger to move in and out of the syringe in flexibility. This could be why we have one irregular result. One of the other reasons could be that the tubing was incorrectly attached to the test tube, which could have lead to the gas being exposed into the air and not through the tube. I believe our experiment went well enough, but if it were possible I would make a few changes. For example: - * I would carry out all the five experiments in one day, as this could have affected my results. The five experiments that we did were done at different timings, which know if the more AC's could have been switched on at certain days. What if during one experiment 3 AC's were on but during another experiment only 1 AC was on. This could have affected the temperature. * I would make the volume lower or lower the mass of magnesium used. This is because I would like to have results that would be on a longer scale of time in seconds. This document was downloaded from Coursework.Info - The UK's Coursework Database ?? ?? ?? ?? Jesal Raipancholia Year 11 CHEMISTRY THE RATES OF REACTION ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Patterns of Behaviour essays

  1. Marked by a teacher

    In this project I am going to investigate rates of reaction of an indigestion ...

    3 star(s)

    The maximum temperature I could definitely reach using boiling water worked out as approximately 50�C. I decided that collecting 50cm� of gas gave a wide range of results. The results I had at that point were: Temperature (�C) Length of time it took to collect 50cm� of gas under the previously mentioned conditions (secs)

  2. Haber Process for the Production of Ammonia

    If the pressure is decreased or the volume is increase, the system will shift to increase pressure. Since more particles = more pressure and knowing that the reactant side has 4 particle and the product side has 2, the system will shift left producing more H2 (g) and N2 (g)

  1. Science Coursework

    I drew 2 graphs to represents my data and my findings to the experiment. The first graph graph A was the concentration of sodium Thiosulphate against the time in seconds. Which was varying from the lowest average time form 42 seconds to 219 seconds being the highest.

  2. Rates of Reaction experiments

    water particles in the acid therefore decreasing the chances that the acid particles have of being obstructed by the water particles instead of colliding with the magnesium particles Temperature- Increasing the temperature in the reaction will result in the acid particles gaining more energy and therefore moving more quickly and

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work