• 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
  12. 12
    12

Whether alcohol is suitable alternative for petrol, and Whether it matters which alcohol we use.

Extracts from this document...

Introduction

Introduction Today, the prices of vital commodities derived from oil are increasing, and in particular, the cost of running a petrol driven car is becoming more expensive to do so, and this is all due to the fact that the amount of oil left to be extracted is diminishing. Thus, a suitable alternative is required. One such candidate is gasohol, which is about % alcohol. This is much cleaner than normal petrol, and also makes the petrol last a lot longer. Thus, my objectives, and the purpose of this piece of coursework is to find out: 1) whether alcohol is suitable alternative for petrol, and 2) Whether it matters which alcohol we use. Preparation In order to complete either objective ("whether alcohol is a suitable alternative for petrol?" And; "Does it matter which alcohol we use?"), I need to make sure that I carry out a fair test, which means that I keep all the variables the same except one, which will be the alcohol. I will also need to repeat the experiment 3 times in order to check the accuracy of the experiment. The variables are: 1) the distance the calorimeter is above the flame 2) the amount of water used 3) ...read more.

Middle

However, in practice, a proportion of this energy will be lost to the surroundings. In order to verify these theoretical results, I need to make some actual measurements. My experiment is set out in the method. Prediction I predict that as the size of the alcohol molecule increases, so will the amount of energy per mole released. I also predict that ethanol will not release as much energy per mole than petrol. Method Apparatus list: Measuring cylinder Copper calorimeter Crucible & glass wool wick [spirit burner] Heat proof mat Clamp & stand Goggles Alcohols - ethanol, propanol and butanol. I will set up the apparatus as shown, using the above equipment. From my preparation experiments, I know that to achieve the best results, I need to use 50cc's [50ml or 50g] of water, and set the calorimeter at 10cm above the top of the spirit burner, which used a 3.5cm high wick. Before I start the experiment, I will need to weigh the spirit burner with alcohol, so that after I have heated the water 10�C, I can weigh it again, and find the mass of alcohol burnt. I can then put this information into the formula: Mass of water x ? ...read more.

Conclusion

But, these molecules require more energy to get them started. There is also a trend in the balanced formulas for the complete combustion of the alcohols. C2H5OH + 3O2 � 2CO2 + 3H2O C3H7OH + 4.5O2 � 3CO2 + 4H2O C4H9OH + 6O2 � 4CO2 + 5H2O With each extra carbon atom in alcohol molecule, there are two extra hydrogen atoms, and 1.5 extra oxygen molecules are needed to completely combust the alcohol. An extra carbon dioxide and an extra water molecule are also produced. This can be turned into a mathematical formula, thus: CnH2n+1OH + 1.5nO2 � nCO2 + n+1H2O This sort of formula is called an homologous series. Alcohols are a homologous series, and other such series include alkanes, and alkenes. What could I do to make this experiment better? To make this experiment work better, and achieve a higher efficiency, I could do several things. First, I could conduct the experiment inside a sealed container, as this would stop air heated by the combustion of the alcohol escaping. The container could also be silvered (this would stop heat being radiated away), as well as being filled with oxygen, which would ensure that as much of the alcohol was oxidised as possible. I could also use a much cleaner copper calorimeter, as this would ensure a good transfer of energy to the water. Peter Hill 11z GCSE Chemistry Coursework 1 ...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 Electricity and Magnetism 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 Electricity and Magnetism essays

  1. Marked by a teacher

    Investigation into Energy Released From Burning Various Alcohols.

    4 star(s)

    I will change the type of alcohol so that I can compare them. I will try to keep the isomers of the alcohol as all the same type, i.e. all 1-ol; however this may prove difficult due to availability. I will also keep things such as time left to burn constant throughout each attempt.

  2. To investigate which fuel gives out the most energy when burnt. We are burning ...

    I first filled a copper can with 100cm3 of water using a measuring cylinder. I then clamped this 12cm above a spirit burner filled with ethanol. I then weighed the spirit burner, and recorded the temperature of the water before the burner is lit.

  1. Finding a material's specific heat capacity

    As seen in the graph, the copper cools slightly faster in the first experiment. This was probably because there was a slight difference in the efficiency of the insulation due to a human error and thus, the cooling rate was slightly higher.

  2. Burning Alcohol

    I will do three replicates and take an average to make sure my results are accurate. Controlled Variables Each experiment, I will keep the same: * The mass of water (100g) * The tin can * The distance between the wick of the alcohol bottle and the tin can (20mm)

  1. To find out what happens to the efficiency of a motor as I change ...

    was altered by the string slipping, rather than by the efficiency of the motor. The reason for the initial rise in efficiency was that the greater the weight between string and spindle, the more friction, therefore the less slipping occurred, causing the gravitational potential energy (useful energy output)

  2. Investigating The Heat Of Combustion Of Alcohols.

    When this is done we see that the total energy released is 5996kJ. When the energy used to break the bonds is taken away from the energy produced when bonds are made we get a total of 1161kJ. We must also notice that 2 moles of carbon dioxide and 3 moles of water is produced.

  1. To investigate the relationship between the structure and heat provided by combustion of a ...

    The type of stirring in terms of frequency and power may affect the results also, and must be kept constant. To control this variable, the same type of stirring will be used each time. The only variable in the experiment will be the changing type of alcohol being combusted, as this is what is being investigated.

  2. Comparing the Energy Released By combustion of Different Alcohols

    Some of the heat will be lost by being blown away and some energy will take the form of light. PRELIMINARY INVESTIGATION * How high do I place the calorimeter above the burner? I found that a decent sized flame was 4cm and therefore I clamped the calorimeter 7cm above the top of the burner.

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