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

The formula of magnesium oxide

Extracts from this document...


TITLE: The formula of magnesium oxide DATE: 11TH MAY 2001 AIM: To find the formula of magnesium oxide by burning a weighed amount of magnesium in air. CONCLUSION: When magnesium is burnt in air, it reacts with oxygen to form magnesium oxide. Once each magnesium atom has bonded with an oxygen atom the weight then changes. The weight change can then be used to find the formula of magnesium oxide. The formula of magnesium oxide is MgO. BACKGROUND: When magnesium is burned in air magnesium oxide is formed. During this reaction the magnesium reacts with oxygen atoms to form a bond between the two, thus becoming heavier in the process. Relevant terms: 1) Mole: The amount of a substance which contains as many atoms or molecules as there are in exactly 12 grams of carbon 12 isotope. 2) Crucible: A container used for heating substances, capable of withstanding extreme heat. 3) Forum: Justification of Procedure: This procedure was used as it is the only way of forming magnesium oxide in air. Oxidation is the loss of electrons. An oxidant is a substance, which oxidises some other substances. ...read more.


Elements Magnesium Mg Oxygen O Weight 36.19 - 36.06 = 0.13g 36.27 - 36.19 = 0.08g 2) Percent Composition % Total weight = 0.13 x 100 = 62 % 0.21 0.08 x 100 = 38 % 0.21 3) Moles Atomic weight = 62 = 2.58 24 38 = 2.38 16 4) Simplest ratio 1 1 5) Empirical formula MgO Questions 1. a) What are the impurities found on the surface of magnesium? Magnesium oxide b) What is the appearance of the magnesium ribbon after cleaning? Shiny silver colour c) What is used to clean the magnesium? Emery paper d) What is the colour of magnesium oxide? Shiny white colour e) Name two compounds formed when magnesium is heated in air? Magnesium oxide and magnesium nitride f) Why is the crucible lid lifted when the magnesium is heated? Too let in oxygen so it can react with the magnesium. g) Why shouldn't a hot object be placed on a balance? Because the first measurement was taken when the crucible was at room temperature and should be consistent in taking the measurements. Eg the crucible could be lighter when it is warmer. ...read more.


The magnesium could have been cleaned for longer. The magnesium could have started out magnesium oxide and therefore not a correct weight change. Make sure the magnesium is pure. Weight might not have been precise. A more precise weighing machine may have been used to get a more precise answer. Magnesium ribbon could have been coiled too much or too little. More effort could have been given to coil it correct. Crucible may not have always been on the hottest part of the flame because the tripod was too high. Use something to raise the bunsen burner so it is at maximum heat level. Magnesium may have escaped from the crucible during the heating process. Don't leave the lid off for too long. The magnesium did not fully react with the oxygen. Heat the magnesium for longer. The crucible had impurities on it that could have reacted with something in the practical and creating a weight change. Clean off all impurities on the crucible. The crucible might not be back to the same temperature when first measured, which could affect the weight. Let the crucible cool right back down before measuring the weight. The air was not 100% oxygen. It has nitrogen, hydrogen and helium, which might have had different reactions with the magnesium. Do the practical in a pure oxygen environment. David Dries 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 Arthur Miller 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 Arthur Miller essays

  1. The Crucible - summary.

    Hale confronts Tituba. He says that if she loves these children she must let God's light shine on her. Hale asks if the Devil comes to her with anybody else. Tituba admits that the devil has come to her, and that the devil promises to return her to Barbados and shows how he

  2. The Crucible.

    This makes Danforth angry as it means that he has a battle to determine if all the girls are lying or if Mary alone is lying. Which ever way Mary chooses she is told by Danforth that she will face a perjury charge and go to jail because as he

  1. The crucible.

    That I found my daughter and my niece dancing like heathen in the forest?" Not only does it ask more questions such as who was there and why were they dancing, again adding to suspicion and ultimately drama, but is sarcastic, as he would never at this point tell the

  2. The Crucible.

    This ironic representation emasculates the males of the society represented and by breaking traditional stereotypes; the drama condemns male dominance in society, but also explores the problems revealed when women are dominant in society. This problem related to gender dominance confuses and complicates male and female roles within society.

  1. To what extent can 'The Crucible' be viewed as a Classical Tragedy?

    'I do think I see some shred of goodness in John Proctor. Not enough to weave a banner with, but white enough to keep it from such dogs'. Elizabeth cannot be persuaded to make John falsely confess when she hears this, she believes he is saving his soul, more important

  2. Essay on 'The Crucible'

    'The Crucible' begins with the village girls cleaning and making something in a pot, which is against the laws of Salem. This action leads to a whole plot of jealousy, betrayal and ends up in hangings. Miller tries to display the act of the girls dancing in the forest as a form of plea, a cry for help.

  1. The Crucible.

    John, after hearing his wife's mention tells Mary Warren to 'go to bed' where she shows the power that she has to the crowd and to John by telling him that she 'will not be ordered to bed anymore.' The heated conversation between John and Mary reaches a crux.

  2. The Crucible - analysing acts 3 and 4.

    She is astonished that John is confessing. The key moment starts with Proctor refusing to say that he saw Rebecca Nurse in the Devil's company, or anybody else. Danforth demands that Proctor prove the purity of his soul by accusing others, but Hale advises that it is enough that he confesses himself.

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