Magnesium Magnesium has the symbol Mg from the greek word magnesia a district of Thessaly, sir Humphrey davy in 1755. Atomic number 12, atomic mass 24.31, 12 electrons, 12 neutrons. Physical properties: magnesium is a shiny, silver or grey coloured metal that is light in weight and strong the density of magnesium is 1.738 g/ml (1). Melting point 650◦C, boiling point 1090◦C (2). This image shows what magnesium This image shows the crystal Metal looks like 2) structure of magnesium 2) Polyvinyl Chloride Polyvinyl chloride is one of the most used polymers in the world. Due to its versatile nature PVC is used extensively across a broad range of industrial, technical and everyday applications …show more content…
The mechanical properties of metals determine the range of usefulness of a material and establish the service life that can be expected. Mechanical properties are also used to help classify and identify material. The most common properties considered are strength, ductility, hardness, impact resistance, and fracture toughness (10). mechanical properties are used in engineering by using a load test to see what the wait is for a job that your on or if you need a 2 tone weight and you make one up so you use the load test to see the weight of it and how much more you need to put on it. You also use material in engineering such as stainless steel and carbon steel. Stainless steel is used because of its high corrosion resistance, high ductility, high strength and hardness and also high hot strength. Carbon steel is also popular in engineering because of its corrosion resistance, hot strength, ductility, high strength and work …show more content…
Physical properties are used to observe and describe matter. Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others (11). Physical properties are used in copper wire because copper wire transfers heat from on end to the other but it still consists of copper at every point. Thermal Properties Every material used in an envelope assembly has fundamental physical properties that determine their energy performance like conductivity, resistance, and thermal mass. Understanding these intrinsic properties will help you chose the right materials to manage heat flows (12). In the real world you would use thermal properties for cooking such as using a frying pan to boil an egg or some other food that can be cooked in a
A characteristic property can help identify a substance. A characteristic property will never change even when the volume of a substance is varied. A characteristic property also does not change when a substance changes state in matter. A physical property cannot identify a substance. A physical property will change when the volume of a substance is varied. It can also change when the substance changes state in matter. For example, if the volume and mass of a substance changes then the physical appearance will also change. However, the density, which is a characteristic property, will not change at all. The boiling point of a substance is the temperature that a substance changes from a liquid to a gas. The boiling point of a substance is a characteristic property because the boiling point of a substance will never change even when the volume and mass changes. The only thing that will change is the time that it takes to reach that temperature. If the mass and volume of the substance is small, then it will take a small amount of time for the substance to reach the temperature. However if the mass and volume of the substance is larger, then it will take a longer time to reach the temperature. The purpose of this lab was to see if when the volume of a substance changes so does the boiling point.
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).
This procedure takes place in an oven called an HCl burner and produces a chemically pure hydrochloric acid that is stored as a concentrated solution (about 30% HCl) and is the purest hydrochloric acid commercially produced. It is chemically possible to produce up to 40% HCl but this solution evaporates a too fast a rate for it to be used for commercial use. However, this method accounts for only 10% of all hydrochloric acid production. Most hydrochloric acid, especially the more diluted solutions, are made as the by-product of creations of PVC plastics. PVC plastics creation use a process called chlorinated and fluorinated. Chlorinated happens when chlorine molecule (Cl2) replace hydrogen atom in the hydrocarbon (R−H) (a type of Haloalkanes) whereupon the released hydrogen atom recombines with the spare atom from the chlorine molecule to form Hydrogen chloride
Service life In terms of the effect of service life on the polymer, this additive has a long service life. Polyvinyl chloride is a substance that has this additive inside it. Due to this the additive makes the polymer stronger and makes the product last longer.
Today, polyvinyl chloride (PVC) is used in many different products across the world. According to the APHA (2011), the material can be found in toys, medical supplies, floors, and even food wrapping. (p. 1) I believe that this material has made it possible for a lot of products to be made that have benefited the human population, but I believe there are many drawbacks to using this material.
The most commonly produced PVC structure by addition polymerisation is the atactic PVC. As seen in Figure #, the chlorine atoms are branched randomly and asymmetrically along the carbon backbone. Unlike the other two structures, the random orientation prevents the polymers from packing closely together and is described to be ‘amorphous’.
"What Is Aluminum Used For? - Curiosity." Curiosity. N.p., n.d. Web. 17 Mar. 2014. .
Carbon improves harden ability, strength, hardness, and wear resistance; it reduces ductility, weldability, and toughness.
Magnesium is one mineral that needs to be present in our diet. Some people are not familiar with Magnesium and its effect like they are familiar with other vitamins, such as vitamin A, D, C, or Calcium.
Conduction, Convection, and Radiation Heat transfer is the way heat moves through matter to change the temperature of other objects. There are three types of heat transfers, Conduction, Convection, and Radiation. The first kind of heat transfer, conduction, is heat transferring through direct contact of materials. This would be the same thing as a pan on the stove. The heat from the stove touches the pan directly, therefore making the pan hot.
Stainless steel is a type of alloy that has a very strong lattice structure (an arrangement/ shape of the crystals or other objects) which in some case can be more beneficial than others depending on the type of application it may be used for. In many cases this structure will make the material more suited to being used in engineering applications such as tools for instance a hammer (stainless steel alloys) , also they can be used for gears, engines, electrical motors and hydraulic systems because the structure makes the material so strong. So when the arrangement of the structure is as above it makes the overall material even stronger which makes it a good for all the applications stated above. I believe its strength and durability are its main properties as these are commonly needed in the engineering industry, although it is also very well known to be used for its corrosion resistance as it is resistant to many types of corrosion. It is used for these properties because the components such as gears need to be strong in order to keep transferring and altering the rotary motion and torque exhibited in the machine that it may be used in, durable to withstand any loads or pressure put onto it and also corrosion resistance to give the components a bigger life span and increase its rate of work throughout its required use.
Aim: The aim of this experiment was to determine the empirical formula of magnesium oxide.
3 cm of magnesium ribbon generally has a mass of 0.04 g and yields 40 cm3 of hydrogen when reacted with excess acid. 50 cm3 of 1M hydrochloric in this experiment is in excess.
, and the volume of H2 is measured. As HCl is in excess, all the
Polymers are made from relatively small molecular fragments known as monomers that are joined together. Synthetic polymers which include the large group known as plastics are divided into three groups: commodity thermoplastic, engineering thermoplastics (ETP), and advanced engineering thermoplastics (AETP). The engineering thermoplastics (ETP) have heat resistance, strong mechanical properties, lightness, self-lubrication, and easy manufacturing. This plastic category has been lately used to replace wood and metal applications.