Determining the Empirical Formula of Magnesium Oxide
INTRODUCTION:
The empirical formula is the simplest and lowest whole number ratio of
the different atoms in a sample of compound. To work out the empirical
formula, the value of moles of the different atoms in a compound is
needed. Mole is just simply a unit used to measure the amount of
atoms, just like how the unit "dozen" is used to measure things such
as eggs. One mole is 6×10^23 atoms and this number is called the
Avogadro number. The mole can be also defined as the number of atoms
in exactly 12g of Carbon.
In this experiment, the magnesium will be heated and this magnesium
will react with the oxygen in the air to form magnesium Oxide.
DIAGRAM:
METHOD:
1. An empty crucible and its lid were weighed on an electrical
balance. The mass of the crucible and its lid were recorded.
2. The surface of the magnesium ribbon was scraped with emery paper to
remove any magnesium oxide on the surface.
3. The magnesium was coiled and placed in the crucible. Then the lid
was replaced on the crucible, and the mass of the crucible with lid
containing the magnesium was found. The mass was recorded.
4. The safety goggle was worn. Then apparatus was setup as shown in
the diagram. The magnesium was first heated with a small blue flame
and after a several minutes with a roaring flame.
5. Every few minutes, the lid of the crucible was lifted carefully
with a tong to see if the magnesium had started to burn and also to
left some air enter the crucible to make the experiment more
efficient.
6. When the magnesium had completely reacted, the crucible was heated
stron...
... middle of paper ...
...al possible source of error is that some white
fume magnesium oxide escaped from the crucible. This error can be
prevented by performing the experiment in a fume cupboard. The most
significant source of error is that some magnesium possibly reacted
with Nitrogen in the air to form Magnesium Nitride. Since 78% of air
is made up of Nitrogen, it is highly possible that some Magnesium
reacted with the Nitrogen. This made the mass of oxygen that reacted
with the magnesium low, which made the mole of magnesium higher than
the accepted value. This error can be prevented by burning the
magnesium in pure oxygen, not air; although, this is very difficult to
do in reality. One way the experiment can be improved is to perform
the experiment several times and record the average result so that a
more accurate result can be obtained.
The procedure of the lab on day one was to get a ring stand and clamp, then put the substance in the test tube. Then put the test tube in the clamp and then get a Bunsen burner. After that put the Bunsen burner underneath the test tube to heat it. The procedure of the lab for day two was almost exactly the same, except the substances that were used were different. The
Inspector Scanlan sent reports every three months from 1942 – 1944 repeating recommendations and adding new ones. He considered Centralia No. 5 the worst mine in his district. Coal dust and gas are explosion hazards. Steps can be taken to minimize these concerns. Rock dusting is a method used to localize an explosion. Illinois law requires rock dusting in a seriously dusty mine. Mr. Scanlan was the first line for the miners. He had the authority to close the mine and did not do it. He later mentioned being afraid of losing his job. It was his responsibility as a public administrator to take action.
The mass of Mg + the mass of O2=mass of MgxOx. Knowing the mass of
Magnesium is an important element necessary healthy bones and teeth. The use of all muscles, and nerves convert it into energy for daily living. It is also instrumental in maintaining adequate levels of calcium in the blood. Having a therapeutic magnesium level helps prevent cardiovascular disease and reduces the risk of bone loss. The body of the adult human contains about 2000 mEq of Mg. Half of this amount stays within the skeleton and the other half in soft tissues (Wacker and Parisi 1968). The normal concentration in the blood is somewhere in the ranges of 1.7-2.3 mg/dL (Magnesium, 2013)
Finding the Solubility of Ca(OH)2 Aim: ---- To determine the solubility of Ca(OH)2. To carry out the aim of this experiment an experiment needs to be planned and carried out. I am given the information that the solubility of the Ca(OH)2 is between 1 to 1.5g per dm3. Also I am given a standard solution of 1M hydrochloric acid (HCl) which may have to be diluted to suit the measuring needs of the experiment. Apparatus: [IMAGE] * 1g of Ca(OH)2.
water and the slower the reaction will be. If the pot is close to the
7.The covered crucible was placed over the flame of the Bunsen Burner using a ring stand.
The melting point for magnesium is 923 K (650°C or 1202°F) and the boiling point is 1363 K (1090°C or 1994°F). Magnesium ions are extremely soluble in water which makes it the third most abundant element dissolved in seawater. The pure element of Magnesium burns and gives off a brilliant-white light, making it a useful ingredient in flashlight photography, flares and pyrotechnics (Gagnon, 2012). Once ignited, magnesium is extremely difficult to extinguish. Attempting to put out the fire using water produces hydrogen, this only intensifies the flames. Magnesium also burns in both pure nitrogen and pure carbon dioxide, so a carbon dioxide fire extinguisher will feed the flames too.
In this lab, I determined the amount of heat exchanged in four different chemical reactions only using two different compounds and water. The two compounds used were Magnesium Hydroxide and Citric Acid. Both compounds were in there solid states in powder form. Magnesium Hydroxide was mixed with water and the change in heat was measured using a thermometer. The next reaction combined citric acid and magnesium hydroxide in water. The change in heat was measured as well. For the third reaction citric acid was placed in water to measure the change in heat. In the last reaction, citric acid was combined with water. The heat exchanged was again measured. It is obvious we were studying the calorimetry of each reaction. We used a calorimeter
This essay is all about the Element Magnesium. Magnesium is one of the wider known Elements from the periodic table and, as stated in the following essay, is very good for the human body, especially the muscles. It is also one that has been put in to a few different forms to be easier to take as a supplement. This is one of the points discussed in the following essay, as well as these other points; the history of Magnesium and its discovery, places you will find it such as food or other sources, its uses, plus potential health benefits and harms.
there was enough grease in the skillet to perform the test. He then put a
NOTE: The stirring rod was not used in the First and Second experiments, as it was not available. A substitute we used the thermometer.
We often chose what tasty rather than what is healthy. We often miss to consider important minerals like magnesium in our diet, which can put our body at risk of chronic diseases.
9. When all magnesium has reacted, remove the lid and heat strongly for 5 minutes
Physical exam. Your health care provider will examine the wound to determine how deep the cut is.