• 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 is MgO. This is predicted from knowledge of the Periodic Table and understanding of bonding.

Extracts from this document...


Finding the formula of Magnesium Oxide Prediction The formula of magnesium oxide is MgO. This is predicted from knowledge of the Periodic Table and understanding of bonding. Method 1. A strip of magnesium ribbon is cleaned using emery paper. 2. A crucible and its lid are weighed. 3. The magnesium is placed in the crucible and the crucible, its lid and contents re-weighed. 4. The crucible is placed on a pipe-clay triangle on a tripod and heated strongly. The lid is raised slightly from time to time to allow air to enter the crucible. 5. When reaction is finished, heating is stopped and the crucible is allowed to cool. 6. The crucible and its contents are re-weighed. 7. Stages 4 - 6 are repeated until the mass is constant. 8. The whole experiment is repeated but for different masses of magnesium oxide. The Results Mass of Crucible +lid (g) Mass of Crucible + lid + Mg (g) Mass of Crucible + lid + MgO (g) 19.69 19.76 19.85 19.16 19.29 19.37 23.61 23.66 23.69 24.20 24.25 24.29 23.60 23.68 23.73 23.55 23.67 23.70 23.67 23.73 23.77 23.06 23.16 23.22 23.23 23.35 23.43 18.94 19.04 19.11 21.39 21.45 21.49 24.75 24.81 24.85 22.52 22.60 22.65 Analysis To be able to find out the ratio of magnesium to oxygen, I have to calculate the amount of magnesium that was used and the amount of oxygen, and so as a result finding out the amount of magnesium oxide that was produced. ...read more.


So, the empirical formula of the product, magnesium oxide, is MgO. In addition to this we can also look at the placement of magnesium and oxygen in the periodic table and the way in which they bond during the reaction. When reacting a metal with a non metal, in this case a gas, they undergo ionic bonding. This is when an atom loses electrons and gives them to another atom which needs to gain electrons in order to have a complete outer shell, or in other words to gain the structure of a noble gas. Magnesium is in the second group and has an electron arrangement of 2.8.2 and so needs to give away two electrons in order to have a full outer shell. Oxygen is in the sixth group of the periodic table and has an electron arrangement of 2.6 and so needs to gain 2 electrons to also have a full outer shell. Diagram to show the reaction of magnesium and oxygen. Now we know that when these two elements react they form magnesium oxide (MgO), which is made up of magnesium ions with a double positive charge (Mg2+) and oxide ions with a double negative charge (O2-). Therefore it must be true that 1 atom of magnesium reacts with 1 atom of oxygen, seeing as when they react their outer shells will be complete, because the magnesium atom needs to give away 2 electrons of which the oxygen atom needs to gain. ...read more.


Also this could have been that the reaction had not fully taken place, and so not all the amount of magnesium was allowed to react with the oxygen in the air. This was the main reason why anomalies occurred. To have avoided this happening, after heating, cooling and weighing the contents and the crucible lid. The magnesium oxide could have been heated again, and weighed until the mass was constant. This would have proved that the magnesium had fully reacted with the oxygen in the air. Despite the anomalies that occurred, it became apparent that they did not affect my results or conclusion in any way, as my prediction was supported. To further this investigation I could: * Try to react other metals from group 2 in the Periodic table with oxygen to see whether a pattern occurs in the result. For example, if I were to react Calcium, Ca, with oxygen then I would expect the empirical formula to be CaO. This is based on the idea that Mg reacted with one oxygen atom, and so Ca will react with one oxygen atom also, seeing as Mg and Ca both have similar properties. * Try to react magnesium with other gases in group 6, such as sulphur, to see whether the empirical formula is MgS, on the basis of my knowledge of magnesium reacting with oxygen. Nana Agyeman. 11V Chemistry Investigation Ms. Yates ...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 Classifying Materials 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 Classifying Materials essays

  1. Marked by a teacher

    Chemistry revision notes. Atomic Structure and Bonding, Electrolysis, Acids and Alkalis.

    5 star(s)

    amount of heat given out by the exothermic reaction will be equal to the amount of heat taken in by the endothermic reaction. e.g. HYDRATED COPPER SULPHATE = ANHYDROUS COPPER SULPHATE + WATER (Blue) (White) If the hydrated copper sulphate is heated, it turns white as the water is given off.

  2. Marked by a teacher

    The Periodic Table - Revision Notes The numbers in italics are the page numbers ...

    5 star(s)

    The top layer is called the first period . The second row is called the second period etc. A vertical line going down the periodic table is called a group of elements .

  1. Marked by a teacher

    Chemistry Revision Notes on atomic structure, nuclear power and the periodic table

    4 star(s)

    The Periodic Table > The periodic table is a classification of all known elements. > The periodic table is classified so that elements are arranged in order of increasing atomic number across a grid. > The periodic table is classified so that all elements are arranged in a series of rows and columns in accordance to the element's chemical properties.

  2. Peer reviewed

    Revision notes on elements, the periodic table and compounds.

    4 star(s)

    Elements + Compounds 3. Compounds + Compounds 4. Combustion Some compounds & their names CuSO4 - Copper sulphate - blue crystals (solid) Cu (OH)2 - Copper hydroxide - blue precipitate (solid) CuCO3 - Copper carbonate - green solid CuCl2 - Copper chloride - green solid NO - 'oxide' NO2 - 'dioxide' CHEMICAL REACTIONS (part 1) (part 1)(part 2)

  1. Investigation to Identify the Formula of Hydrated Copper Sulphate and in doing so Find ...

    automate the experiment to leave as little human contact as possible from the experiment and so leave a smaller margin of error.

  2. Relationship between mass of MgO and its formula

    So from his information we now know if this composition changes it is a different substance. As you can see below here is a visual representation of the of constant composition as the composition is always the same no matter how many atoms there are.

  1. Free essay

    Periodic table

    Cl-1, Mg-2 Atoms: Atoms - tiny indestructible particles Protons - The positively charged particles in the centre of the atom Neutrons - The neutrally charged particles in the centre of the atom Nucleus - very small and dense centre of an atom, it contains protons and neutrons Electrons -

  2. The Structure of the Atom.

    0.96 11.0 22.2 27.3 26.7 11.8 The Mass Spectrometer. How is one able to detect the presence of isotopes? The Mass Spectrometer (shown below) allows us to discriminate between particles based on their masses. The operation of the mass spectrometer is described below. A sample compound, for example a natural isotopic sample of atomic chlorine, is placed into a mass spectrometer.

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