Introduction The element Chromium is very important in the industrial world. It is used in nonferrous alloys such as stainless steel, in order to increase its hardness and prevent corrosion and oxidation. Chromium is only found in one ore, the mineral Chromite. Chromite’s composition is iron magnesium oxide [(Fe, Mg) Cr2O4]. Occasionally, magnesium will substitute for iron, and aluminum and ferric ions will substitute for chromium.
Naturally occurring chromite is composed of small amounts of titanium, zinc, cobalt, nickel, and manganese. Due to this, chromite is responsible for a multitude of industrial contributions to society. When chromium is extracted from chromite, it produces a metal alloy known as stainless steel. Since chromite has high heat stability, it is often used as a refractory material. Also, the resistance to high temperatures and pressures allow it to go through the metamorphic processes unscathed.
In the other, aluminum leftovers, the activity series was used to understand how and why the reaction took place and stoichiometry was used to predict the amount of aluminum that should have reacted in the following equation: 3CuCl2 * 2H2O (aq) + 2Al (s) 2AlCl3 (aq) + 3Cu (s) + 6H2O Stoichiometry’s importance in the laboratory is well defined in the results of the previously mentioned experiments. Materials:
Since we used our chromatography method, we will be able to figure out which metals our substance contains. It is important to know this especially if we are ingesting and coming in contact with them. Chromatography is a separation technique that works based on the compound interactions as those compounds tend to move within a supporting medium. The compounds interact in two phases; mobile and stationary phase. The techniques help analyzing.
6. Describe the way in which the above named industrial and medical radioisotopes are used and explain their use in terms of their chemical properties. Cobalt-60 is used in industrial radiography to inspect metal parts and welds for defects. Beams of radiation are directed at the object to be checked from a sealed source of Co-60. Radiographic film on the opposite side of the source is exposed when it is struck by radiation passing through the objects being tested.
The purpose of the lab was to determine which reactant was the limiting reactant, and to see how much of the other reactant was used. The true molarity of a compound can be defined as the amount of moles per liter of that substance. The equation of this single displacement chemical reaction done during this lab is 2Al(s) + 3CuCl(aq) → 3Cu (s) + 2AlCl2 (aq). In the reaction, the solid Aluminum replaces the Copper in Copper (II) Chloride to produce solid copper, and Aluminum Chloride. In order to find which reactant is the limiting reactant, an equation based on the molarity of the Copper (II) Chloride may be used, or the products of the reaction may be observed.
Discuss each of the following physical properties of minerals: crystal form, color, streak, luster, hardness, cleavage, fracture, and specific gravity. What is responsible for the physical properties of minerals? Crystal form – Shape is determined by internal structure of mineral & most aren’t perfect b/c they don’t have enough space to form properly. Color- Least reliable. Streak- Color of a mineral in powdered form.
Metal, Metalloid, or Nonmetal act activity 11/2/2014 The chemical reactions given off by each element will be studied Supplies see lab Procedure see lab Iv the types of elements used Dv the chemical reaction given off Constants well plates, spatula, pipette, wash bottles, HCI, and 1MCuCl2 Conductivity Mg no C yes S no Si yes Pb no Sn yes S brittle Pb Malleable Si Malleable Mg Malleable Sn Brittle C Malleable Crushing Qualitative observations Pb, Mg, and Si had a shiny and reflective surface S had a yellow and dusty surface Sn had a lined surface while C has a smooth surface Data analysis Pb, Mg, and Sn are metals. S and C are nonmetals. Si is a metalloids. You can tell whether a element is a metal or nonmetal based on its place on the periodic table, elements on the left side are metals, elements on the right are non metals, where the left and the right meet up we get the metalloids, elements sharing both the properties of metals and nonmetals. I can also figure this out from are observation of the elements.
| Compound vs. Mixture | Introduction to Physical Science | 5/11/2012 | | Abstract This paper discusses compounds and mixtures. It tells the difference between two as well as the different types of bonds that are involved with them. The paper will discuss what happens to the bonds when they form with metal and nonmetals on the Periodic Table. There are an abundance of terms that are used in the study of chemistry that are used in our everyday life.
Experimental Design: - Independent Variable: different types of metals: magnesium, zinc and Copper - Dependent Variable: amount of reactants observed for each metal - Control : The Air -Constants: The amount of chemical solutions, the time the metals were in the chemical solutions and size of each metal during the experiment 4. The Dependent variable, the number of reactions the metal will receive and will be measured based on their reactivity. The higher the reactant, the more reactions and the less reactive the less amount of reactions The Independent variable, the different metals that are tested by observing for chemical change. Once the metals which are magnesium, copper and zinc are put into the 3 different solutions along with the control which is water and air, we will be able to determine if they do