• 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...


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.


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.


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. Free essay

    Chemistry investigation

    It is a clear indication to how the magnesium reacts and at what temperature. There are, however, some inaccuracies to the formation of the set up. Some of the thermal energy detected by the thermometer is sometimes transferred into the glass of the conical flask which led to an inaccurate reading.

  2. Measuring the energy released by burning ethanol.

    The more ethanol used the more heat increased. Therefore the graph should look like this: The boiling point of water is 100�C. That is the maximum temperature that water can boil which is why the line levels out. I think that mathematically the figure should double- for example if there

  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. Antacid Investigation.

    + CO2 (g) + H2O (l) Sodium bicarbonate (s) + Hydrochloric acid (aq) --> Sodium chloride (aq) + Carbon Dioxide (g) + Water (l) NaHCO3 (sol)+ 1HCl (aq )--> 1Na Cl (aq)+ H2O (aq) + CO2 (gas) Initial Calculations. For all these calculations I shall be using 1 Molar of hydrochloric acid.

  1. Establish what types of soil holds the most water and to see if changing ...

    * Get four large containers and fill them with all the different types of soil. From this measure 15g of each type of soil and put them in the separate filter funnels - do not mix soil types. * Fill small four beakers with about 47g of normal tap water

  2. 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.

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