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

Investigation into the energy produced per mole when burning different alcohols to heat up water.

Extracts from this document...

Introduction

Investigation into the energy produced per mole when burning different alcohols to heat up water. Plan The aim of this investigation is to find out how much energy is produced per mole of alcohol when burning the alcohol to heat up water to a certain temperature rise. Equipment 5 Alcohol Burners: Methanol, Ethanol, Propanol, Butanol, Pentanol, Bunsen Burner, Splints, Wooden Board, Safety Glasses, 200ml beaker, Water, Thermometer, Clamp Stand, Ruler, Scales, Measuring Cylinder, Method Set up all the equipment as shown above. First weigh the alcohol burner, so that the amount of alcohol that has been burnt can be worked out after the experiment has been carried out. Then fill up the beaker with 100mls of water, using the measuring cylinder for greater accuracy. The water used will always be around room temperature, because it is from the tap. Place the alcohol burner on to the wooden board next to the clamp stand, and then attach the beaker with water in, to the clamp stand, directly above the alcohol burner and 15cm from the board, and put the thermometer into the water. ...read more.

Middle

Then, using the formula masses, work out the number of moles of alcohol burnt by doing this equation: Number of moles = Mass of alcohol burnt Formula mass of alcohol Using the answer to this equation, work out what the amount of energy produced per mole of alcohol burnt is by using this equation: Amount of energy going into the water Number of moles of alcohol burnt Fair Test To make this investigation fair, I will make sure that I only change one variable throughout the experiment, and keep all the other variables the same. This will make it a controlled investigation. Variable Variable that I will be changing Throughout this investigation, I will be testing the effect that different alcohols have on the amount of energy produced per mole, so the only variable that I will be changing is the type of alcohol that is being used. Variables that I will be keeping the same The variables that I will be keeping the same throughout this investigation are: * The rise in temperature of the water. ...read more.

Conclusion

Bonds between different atoms require or release different amounts of energy when broken or made because they are different in strength. The energy that is produced per mole is the bond energy, or enthalpy. This is the energy that is required to break one particular bond. I predicted that the energy produced per mole would increase as the number of bonds in the alcohol. This is because of the breaking of bonds between the molecules within the alcohols. The minimum energy that the molecules must possess in order for the bonds to break is called the activation energy. If they gain enough energy while they are colliding during the reaction, the process of bond breaking can start. As this process of bond breaking goes on, new bonds start to form. This is the reactant molecule reacting, and changing into the product molecules of the reaction. The activation energy in the reaction is less than the energy that is released from the new bonds. Overall, the more bonds that have to be broken within the alcohol, the more energy will be produced in the 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 Aqueous Chemistry 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 Aqueous Chemistry essays

  1. Indigestion Tablets Investigation

    The mass of each tablet should have only varied slightly from tablet to tablet. To check that each indigestion tablet was the same I could weigh the tablets using a digital scale that is accurate to at least 100th of a gram.

  2. Antacid Investigation.

    shall times this by 1000 to get it in cm cubed so it shall equal = 0.2 cm cubed to neutralise the antacid. Predicted volume= 0.2 cm cubed + 13.6 cm cubed = 13.8 cm cubed of acid needed to neutralise the tablet Calculations for Boots antacid tablet.

  1. Investigate how the amount of heat produced by burning a fuel depends on the ...

    For a definition, we can say that the enthalpy of reaction ( H) is the heat change which occurs when the number of moles of reactants indicated by the equation react together. These changes in enthalpy may be represented on energy level diagrams'.

  2. Specific Heat Capacity

    I then, repeated the experiment for each other block. Once I had obtained a result for the final temperature, I calculated the cooling correction by adding the temperature drop in half the time taken to reach the maximum temperature. This can also be found by a graphical method which is

  1. Aspirin Investigation

    The length of time that the blood supply is blocked or severely reduced to the heart muscle may determine if the heart muscle is significantly weakened or even suffers cell death. Aspirin's anti-coagulant ability lessens the chances of clot formation and reduces the ability of platelets to block arteries narrowed by accumulated plaque.

  2. Reactivity Series Investigation

    If inhaled calcium powder, remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Keep patient quiet in half upright position. Get medical attention immediately.If swallowed calcium powder, DO NOT INDUCE VOMITING. Give large quantities of water. Never give anything by mouth to an unconscious person.

  1. This experiment is to investigate how much energy alcohols give off when they are ...

    we are burning is the same as the heat energy absorbed by the water. The specific heat capacity is the amount of energy required to heat the substance. The specific heat capacity of water is 4.2J/�C because that is the reliable figure that I have researched The bonds are made due to the forces of attraction between the atoms.

  2. An investigation to see how the energy is released by burning alcohols depends on ...

    o The distance between the can and the flame. If the distance between the can and the flame is reduced, the can will conduct the heat better and more efficiently, thereby increasing the temperature of the water in the can faster and using less alcohol.

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