Essay preview GCSE CLASSIFYING MATERIALS September 12, 2003 Experiment: To Determine 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.
2. Clean the magnesium ribbon with sandpaper. 3. Coil the ribbon and place it in the crucible. Weigh the crucible with its lid and the content in it.
Find the mass of the contents of the crucible. This is your new compound of magnesium. The mass of the magnesium oxide compound is 0.971. I got this answer my subtracting the mass of the crucible lid and contents after the reaction with the mass of the crucible lid and contents after the reaction, which equals 0.382. Then I added 0.382 to the mass of magnesium ribbon, which is 0.589 to get 0.971.
Introduction: The purpose of this experiment is to determine the empirical formula of magnesium oxide formed by the reaction of magnesium with oxygen. To work out formula by the experiment it is necessary to measure the exact masses of each element present in a sample of a compound. Knowing the masses of magnesium and oxygen and its molar masses it is possible to find how many moles of each element is present in the magnesium oxide. The number of moles then can be used to obtain a molar ratio, which gives us the empirical formula of the compound. During the combustion reaction the ribbon of magnesium metal is heated, it reacts with oxygen from the air in a crucible, producing magnesium oxide: magnesium + oxygen → magnesium oxide We measure the mass of magnesium we use for the reaction, and the mass of magnesium oxide produced at the end of it, then we can work out the mass of oxygen that has been combined with the magnesium.
The Empirical Formula is MgCl2. Conclusion: The purpose of this lab was to determine what the empirical formula of magnesium chloride. Through the calculations I have made, I have determined that the empirical formula of magnesium chloride is one magnesium atom and 2
Measure and record the mass of the test tube and metal. 5. Place the test tube containing the metal into the beaker of water and continue heating (10 min). Leave the test tube in the boiling water bath while you complete steps 6 and 7. 6.
“Density is the mass per unit volume of a material”. (Coordinated Science, pg. 354) By calculating the density of post 1983 pennies, we can compare it to the given density values of other metals to find the metal used in the core of a penny. Conclusion The metal used inside post 1983 pennies is zinc. We came to this conclusion by calculating the density of post 1983 pennies using the equation; massvolume=density.
The only ore that contains chromium is the mineral chromite, which is iron magnesium chromium oxide. Chromite has a high melting point and a stable crystalline structure. The purpose of this experiment is to determine the chemical content of an unknown metal ore sample to confirm that the unknown sample is mineral chromite. The content of the unknown sample will be determined by the use of a type of extractive metallurgy that uses the chemistry of an aqueous solution to remove metals from salts, minerals, and ores. This type of extractive metallurgy is called hydrometallurgy.
4. Place the aluminum foil packet of crayon “sediment” between the two boards. Then hammer on the top board to flatten the crayon shavings. 5. Open the foil packet and examine your crayon “sediment”.
Lost Wax casting is still used world wide to create metal statue or artwork or furniture. The method of using Lost Wax Casting is that first you mold the hard clay, the base cord hard clay. Next you wrap the base cord with bees wax. Then you curved it the image or a sculpture. In order for you to bring the detailed of the curving you have to now damp it with the sand.