• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Investigating the alcohols that use the most amount of energy to burn.

Extracts from this document...

Introduction

Investigating the alcohols that use the most amount of energy to burn Aim To find out which fuel uses the most amount of energy per mole Background Information We know already how atoms can 'exchange partners' in chemical reactions. This means that the bonds which join atoms to each other must be broken. However, new bonds have to be made as the product forms. Energy is needed to break bonds, it is like pulling 2 strong magnets apart, to pull the 2 magnets apart you require energy, therefore 'breaking bonds' requires energy and because it requires energy this means that it is endothermic. When you make new bonds it is the opposite of the above, it is like 2 magnets moving together because of the attraction, and because making bonds gives out energy it is exothermic. Bond Energy Bond energy is the amount of energy needed to break chemical bonds. We are able to calculate this energy from the table below, were we can see that particular bond require more energy than others to break. We can see from this table that bond energy is written in KJ/mol. ?H is also measured in KJ/mol. This unit stands for Kilojoules per mole and it is the energy needed to break a set number of bonds. ...read more.

Middle

= 20 * 4.2 * 16 = 1344J So amount of energy per gram = energy produced (J) / mass lost (g) =1344 / 1.5 = 896 J/g So amount of energy per mole = energy per gram * relative molecular mass = 896 * 74 = 66,304 J/mol or 66.304 KJ/mol Propanol Propanol energy produced = mass of water * 4.2 * ? = 20 * 4.2 * 19 = 1596J So amount of energy per gram = energy produced (J) / mass lost (g) =1596 / 1.5 = 1064 J/g So amount of energy per mole = energy per gram * relative molecular mass = 1064 * 60 = 63,840 J/mol or 63.840 KJ/mol Now that I have calculated the amount of energy used per mole I can draw up a final table of results that I can draw my graph from. Alcohol Mass (g) Time (m) Temperature Increase (c) Water Mass (cl) Mass at End (g) Energy used per mole (J/mol) Methanol 170.00 5.00 12 20 168.500 21.50 Ethanol 170.00 5.00 14 20 168.500 36.00 Butanol 170.00 5.00 16 20 168.500 66.30 Propanol 170.00 5.00 19 20 168.500 108.53 Prediction After analysing my preliminary results and my background information I think that the Butanol will give off the most energy per mole. ...read more.

Conclusion

/ 1.42 = 9464.78 J/g To calculate energy per mole we use energy per gram * relative molecular mass. Methanol = 4937 * 32 =136,320 J/mol Ethanol = 8093.75 * 46 =372,312.5 J/mol Butanol = 4937 * 74 =662,360.68 J/mol Propanol = 4937 * 60 =464545.2 J/mol Analysis From my graph I can see that Butanol (CH2 * 4) gives out the most amount of energy per mole. Butanol gives out the most amount of energy per mole because it has the most amount of atoms meaning a higher atomic mass. With a higher atomic mass we get higher bond energy, if there is high bond energy the alcohol is going to use a high amount of energy per mole. I know that because we are breaking bonds and we found that Butanol is giving out energy the process of breaking bonds is known as an exothermic reaction. Evaluation I think that this experiment could have been improved if we used more alcohols say something like 8 or 9 different alcohols to provide us with a larger scale of results, I think this would have improved the experiment because we would have had more results to analyse and conclude. A way in which this experiment could have been conducted better would be to have more accurate measuring facilities and a way in which we could more accurately calculate the energy per mole. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Energy, Respiration & the Environment 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 AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    To make sure we have plenty of energy in the future, it's up to ...

    4 star(s)

    or pumped from below the ground (like oil and natural gas). 3. California produces about one-half of the oil it uses. The rest comes from Alaska and other countries. 4. Oil is transported in huge pipelines and tanker ships to places where it is made into other products.

  2. Marked by a teacher

    Find the relationship between amount of fat and amount of energy produced in different ...

    4 star(s)

    The tip of a flame is the hottest part. If the distance were altered, it would apply different amounts of heat to the boiling tube. Again, this would lead to inaccurate results. The amount of time taken to move ignited food to the boiling tube must be as quick as possible.

  1. Energy absorbed by a bouncing ball.

    The tennis ball is also made from a rubber but it is covered in a felt/carpet material which does not allow it to bounce as high. The second graph is of the initial height of the ball and the fraction of energy absorbed in the bounce.

  2. Why the Body Needs Energy? Every living cell within the ...

    Ventilation - Inspiration and Expiration * Air enters the respiratory system. * This is known as inspiration or inhalation this happens when the pressure is lower inside the lungs and leaves the lungs when the pressure in the atmosphere around the body is lower this is known as expiration or exhalation.

  1. The theory of relativity and its use in Sci-Fi.

    The increase in mass, however, is best understood not as a change in mass but as a change in the relationship of mass and momentum. Momentum (p) is the product of mass x velocity. Here, p' is the relativistic momentum and m is the rest mass.

  2. Discuss the Advantages and Disadvantages of being Ectothermic and Endothermic for Vertebrates.

    For ectotherms to remain active they must maintain a certain body temperature, enabling necessary biochemical reactions to continue. This has been perfected in some species, to such an extent that their body temperature only varies by a few degrees throughout the day; body temperature doesn't fluctuate by any more than 10?C in most ectothermic species.

  1. Discuss the Advantages and Disadvantages of being Ectothermic and Endothermic in the Vertebrates.

    or orientation. Many ectotherms live in burrows (controlled microhabitats) and only emerge for a certain period each day when the temperature is warm (or cool) enough for them to be active, the remaining time they spend in a torpid state.

  2. To calculate the energy per mole of substance

    = 6.57(1/0.0469) =140.08529 kj/mole so this means that the energy per mole of an alcohol with a chain one carbon long, will release 140.085kj per mole of the substance burned. Structural formula: Molecular formula: CH3OH Total number of bonds between elements: 4 Combustion of methanol: CH3OH + 1.5O2 --> 2H2O + CO2 Ethanol (C2H5OH)

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