• 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

In this experiment, I plan to find out the difference in energy release between different sorts of alcohols. To do this I will test how much alcohol is required to increase the temperature of 100ml of water by 30 degrees Celsius.

Extracts from this document...

Introduction

Plan In this experiment, I plan to find out the difference in energy release between different sorts of alcohols. To do this I will test how much alcohol is required to increase the temperature of 100ml of water by 30 degrees Celsius. Obviously, many factors may affect my results, therefore making them less reliable. To improve my results, I will carry out some preliminary research to see if I can improve the reliability and accuracy. Please see attached preliminary work for details (sheet 2a). The preliminary work showed, in short, that it was beneficial to use an aluminium foil shield to reduce heat loss. I will set up my apparatus as shown below. To ensure my experiment is safe, I will sport goggles and comply with all of the normal laboratory requirements, such as not sitting on benches. To further my acknowledgement of safety, I will have to take care as one of the alcohols burns with a clear flame. I predict that, from observing my bond energy calculations (sheet 1a), the alcohol that will heat up the water in the least weight loss will be Butanol. ...read more.

Middle

1.10 Methanol Initial weight of burner (with lid) (grams) Weight after 30C temperature rise (with lid) (grams) Weight loss (grams) 1st attempt 245.78 244.75 1.03 2nd attempt 244.48 243.16 1.32 (ignored) 3rd attempt 243.02 241.98 1.04 Average weight loss (grams) 1.04 Butanol Initial weight of burner (with lid) (grams) Weight after 30C temperature rise (with lid) (grams) Weight loss (grams) 1st attempt 250.46 249.97 0.49 2nd attempt 249.65 249.14 0.51 3rd attempt 249.01 248.47 0.54 Average weight loss (grams) 0.51 Propanol Initial weight of burner (with lid) (grams) Weight after 30C temperature rise (with lid) (grams) Weight loss (grams) 1st attempt 207.24 206.01 1.23 2nd attempt 205.92 204.72 1.2 3rd attempt 204.67 203.45 1.22 Average weight loss (grams) 1.22 Analysis Using the above results, I am now able to work out the energy transferred per mole. Energy required in order to heat up 100ml water by 30 degrees (using the formula 'energy = mass * temperature change * specific heat capacity): 100ml = roughly 100g 100g * 30 degrees * 4.2 = 12600J = 12.6kJ Using this, I can find out how much energy was transferred into the water ...read more.

Conclusion

Evaluation Although I tried to maintain accuracy throughout my work, undoubtedly, many factors influenced the true precision. Factors which I believe effected my results are as follows: * Heat loss to the surroundings; therefore, energy that should have heated the water was wasted. * Evaporation loosing water, therefore meaning there was less water present to be heated. * Evaporation is a cooling process and therefore heat may have been lost this way. To overcome heat loss, I did primary research and found out that a heat shield was the most beneficial way to reduce this. This, however, may have presented another problem of incomplete combustion of the alcohol due to lack of oxygen. To fix this problem, I could implement some form of oxygen pump. The procedure itself was fine for the levels of reliability I hoped to achieve, yet, if being tested in a laboratory for professional use, more expensive equipment could be used that is beyond our means. The evidence does support my predictions fully, and it safe to say it is sufficient to support a firm conclusion about the series of alcohols. To expand the experiment further, I could test other alcohols and investigate the associations betwixt them. ...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 Organic 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

Related GCSE Organic Chemistry essays

1. Chemistry - Reactivity Serires report

4 star(s)

Also, if the temperature of the metal solution were high, the reaction will occur faster than at room temperature. Hypothesis: It is likely to be seen that because that "magnesium" metal, they are group one metal, and there's only 1 electron in their outer shells, therefore they would be very reactive.

2. Titration experiment - write up

Do a rough titration to give a rough indication of where the colour change occurs. 9) Keep the number of indicator drops added constant (e.g. - always add 4 drops each time.) 10) Use a white tile, so that the colour change is recognized more easily.

1. To determine which alcohol, out of ethanol and propanol, is the better fuel. By ...

Now that I have obtained these averages I can calculate the enthalpy change of combustion for 1g of each fuel. Ethanol = (19026/2.26 + 18354/2.22 + 11655/1.42 + 11172/1.41)

2. Investigate the enthalpy change of different alcohol

1 mole of butan-1-ol: 74 > Number of moles of butan-1-ol used: 0.68/74 = 0.009189 mol (corrected to 6 decimal places) > Energy transferred by this number of moles of butan-1-ol: 13969.5J > Energy transferred by 1 mole of butan-1-ol: 13969.5J/-0.009189 mol = -1,520,187J/mol (corrected to the nearest integer)

1. An experiment to investigate the factors that determine the amount of energy released when ...

I also chose a beaker because not much of the heat can escape around it, therefore I will get more reliable results. To hold the beaker of water above the burning alcohol, I decided to use a boss and clamp and a retort stand; these would hold the beaker firmly above the crucible giving a smaller probability of an accident.

2. Investigate the different amounts of energy given off when different alcohols are combusted. I ...

Luckily there were no readings that were harder to take than any others, the experiment was fairly consistent in its method and there was no need for sudden change in anything. If you have a look at the difference between temperature changes of the same Alcohol then they seem a little far apart from each other.

1. The Energy Content Of Different Fuels

I will record all of my results in a table like this: Fuel Temp. Before (?C) Temp. After (?C) Mass Before (g) Mass After (g) Distance (cm) Methanol Ethanol Propanol Butanol Pentanol The last column labelled 'distance' is the distance between the boiling tube and the clamp stand and I

2. GCSE Chemistry Revision Notes - everything!

Oil or grease. These also prevent oxygen or water coming into contact with the iron. This method is particularly useful when parts are moving. 3. Galvanising (coating with zinc). This is often used with fences, as it cannot be used for food cans, as zinc compounds are poisonous.

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