2.4.1 Magnesium Properties Figure 2.7 shows the properties of magnesium based on physical, mechanical and chemical properties. Magnesium element is strong, ductile and light- weight metal. It is malleable when heated and react slowly in cold water. The chemical properties are it is highly flammable metal and high chemical reactivity (Boccaccini & Gough, 2007). Figure 2.7: The characteristic of magnesium Table 2.4: Physical properties of pure magnesium (International Magnesium Association, 1943) Physical Properties Value Density (g/cm3) 1.74 Specific Gravity 1.7 Atomic Radius (nm) 0.160 Melting Point ( oC) 650 Specific Heat (J/kg.K) 1025 Table 2.5: Mechanical properties of pure magnesium (International Magnesium Association, 1943) Mechanical Properties Value Tensile Strength (MPa) 100 Yield Strength (MPa) 232 Elongation (%) 7 Brinell Harness (BHN) 75 Table 2.6: Chemical properties of magnesium (Lenntech , 1993) Metallic Element Atomic Number 12 Atomic Mass 24.305 g.mol-1 Group Number 2 Density 1.74g.cm-3 at 20 oC Boiling Point 1107 oC …show more content…
Mechanochemical processes are simple, low-cost technology and environmental and the Planetary Ball Mill machine is used in this mechanochemical process. This Ball Mill machine performs as a grinding by rotating the balls and the materials inside the containers. Collision of ball can make the energy transfer from each of the ball to the sample material inside the closed container. As a result, the particle of sample size decreases due to the surface energy increase. The sample size will change and the chemical reactions also will happen in the materials where the mechanochemical reactions are happened in this stage (Hao Wu & Qiang Li, 2012). In this research, mechanical milling is being used because it refers to the milling of pure metals and compounds (P.G.McCormick & F.H.Froes,
Compared with the accepted value of –601.8 kJ/mol Mg, our experimental error was 2.46%. Introduction In this investigation the change in enthalpy will be determined from the following equation: 2Mg + O2 ® 2MgO, but in an indirect manner. Magnesium metal burns on a bright, extremely hot flame to produce magnesium oxide. It would be difficult to measure the heat of the reaction since the reaction is rapid and occurs at a high temperature (LeMay et al, 1996).
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)
Lithium has an atomic number of 3, and an atomic weight of 6.94. In general, lithium is more stable than hydrogen, and slightly less stable than nitrogen, carbon, and oxygen. When looking at chemical ion properties, it is useful to consider three main characteristics: the size, or radius, of the ion, the charge, and the ion's electron affinity. Lithium has a similar charge to radius ratio to that of magnesium, which is in group IIA of the periodic table, and so chemists say that the two elements are "chemically similar.
Molybdenum is a transition metal. It is represented by the symbol Mo. It is a pure metal that is is silverish white in color and very hard, and has one of the highest melting points of all pure elements at 4753 °F. Its boiling point is 8382 °F. Its density is 10280 kg/m3 and its hardness is 5.5.
Since all metals have different densities and makeups I think that the heat capacity will greatly vary. The makeup of iron is very different than aluminum so the heat capacity will be quite different. Also, a lot of metals are not completely pure and that will also have some effect on the heat capacity.
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
with a tong to see if the magnesium had started to burn and also to
Potassium is a solid silvery white element. It is soft and can be cut with a knife. Potassium is the least dense known metal, besides lithium. It is the seventh most abundant element. It makes up about 1.5% by weight of the earth's crust. It decomposes in water because of the hydrogen. It usually catches fire during reaction with water.
Magnesium is an important element in our bodies. It is present in many types food and it can be provided through medications. Magnesium is considered a cofactor in more than 300 enzymes system that control and regulate diver’s biological reaction in the human body, like protein synthesis, muscle and nerve function, blood glucose, and blood pressure control.
Cold rolling in combination with annealing in a controlled atmosphere furnace, by grinding with abrasives, or by buffing a finely ground surface
Keep it Simple Science. Production of Materials. Port Macquarie: Keep it Simple Science, 2005. 24-27. Print
Investigating the Effect of Concentration of Dilute Hydrochloric Acid with Magnesium Metal Aim: To investigate the effect of concentration of dilute hydrochloric acid when it reacts with magnesium metal. Scientific Knowledge: Concentrated acid contains many acid particles. In order for a reaction to take place acid particles must collide with magnesium atoms breaking the chemical bonds, there must also be enough energy within the reaction for them to collide; otherwise they would simply bounce off each other. A reaction that does have enough energy to create a reaction is referred to as an effective collision. Within a reaction containing a high concentration of acid, a collision between acid particles and magnesium atoms is very likely.