The reaction that occurred with this step was displacement and metathesis in the form of gas formation. The balanced equation of this step looks as follows: CuSO4aq+Zns→Cus+ZnSO4(aq) Once this step was finished, the remaining copper was retrieved. First, to recover the copper HCl was added to remove all the zinc. When this happened, a yellow tint was observed in the liquid, as well as bubbling as the zinc was broken down. Once the copper dried out, it was weighed and came to a total of 240 mg.
The cut is fairly smooth, but the kerf can be quite large and much metal can be wasted. The most common fuel used is Acetylene, though other fuels such as propane, MAPP, propanol, and other gases can be substituted. Acetylene gives the most thermal value when mixed and burned with pure oxygen. This allows shorter preheat times and faster cuts. Some torch systems allow the use of several different gases without major equipment changes other than the cutting tip.
During the process of TIG welding, an arc is formed between a pointed tungsten electrode and the area to be welded. As a result of the gas shield, a clean weld is formed. This prevents oxidization from occurring. The arc is started with a tungsten electrode shielded by inert gas and filler rod is fed into the weld puddle separately. A slower process than MIG, it produces a more precise weld and can be used at lower amperages for thinner metal and can be used on exotic metals.
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.
Hydrometallurgy to Analyze a Chromite Sample Introduction: Chromium is a metallic element that is used for many industrial purposes, such as metal plating, leather processing, pigments, surface treatments, refractories, and catalysts. The only ore of chromium is the mineral chromite, or iron magnesium chromium oxide. In order to utilize chromium, it must be extracted from the chromite ore. The process of removing a metallic element from its ore is called extractive metallurgy. One form of extractive metallurgy, called hydrometallurgy, uses aqueous solution chemistry for the recovery of metals from salts minerals or ores.
Results: Zinc Metal - Iodine - Iodide + Triodide + Zinc Ion + Focus Questions: 1. Is there a way to put energy into Zinc Iodide in order to regain the elements, zinc and iodine? If there is a way, how does it happen? Yes, this can be done through electrolysis using a battery and exposed wire tips. Take sample of Zinc Iodide and dissolve in solution.
The carbon rod is surrounded by a layer of manganese dioxide (MnO2), and a thick paste of ammonium chloride (NH4Cl) and zinc chloride (ZnCl2), which serves as an electrolyte. The oxidation reaction that takes place on the zinc casing is: Zn(s)→Zn+2+2e- While the reduction reaction that takes place on the carbon rod is: 2MnO2+2H+(aq)+2e-→Mn2O3(s)+H2O(l) The overall reaction is: Zn(s)+2MnO2+2NH4+(s)→Mn2O3(s)+Zn(NH3)22+(aq)+H2O(l) The standard dry cell contains 1.5V. The reactions present in dry cells continue until they run out of a reactant (the anode or cathode). However, there are cells that can be recharged, as the redox reaction can be reversed in order to regenerate the original reactants. Some examples of these batteries include lithium batteries and car batteries.
They came out with air-cooled and water-cooled torches, gas lenses to improve shielding and other accessories that increased the use of the process. Initially, the electrode would overheat and particles of tungsten would transfer to the weld. To fix this problem they switched the polarity from positive to negative, but the change made it unsuitable for welding many non-ferrous metals. Finally, they developed alternating current units which made it possible to stabilize the arc and produce high quality aluminum and magnesium welds. In the 1950’s, some welders started to use carbon dioxide as a shielding gas as an alternative to the more expensive argon and helium.
- signs of chemical change = changes the shape and color, creates a gas, distributes heat, Etc. - Chemical Change= Substance is formed into a completely new substance 2. Hypothesis: If the copper is being tested in these metals ( Copper, Magnesium and cupric chloride) then it would be the least reactive out of magnesium and zinc because it is the lowest among the three on the activity series. 3. 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 cryogenic process actually embrittle a material prior to size reduction and controls heat buildup in the grinding equipment. The result is high product quality and system productivity. Cryogenic grinding involves cooling a material below its embitterment temperature with a cryogenic fluid, typically liquid nitrogen or, in certain applications, carbon dioxide. After cooling, the material is fed into an impact mill where it is reduced in size primarily by brittle fracture Cryogenic grinding is used for grinding spices, thermoplastics, Elastomers, color concentrates, and similar materials. It is also used to recover a variety of scrap materials, such as factory scrap rubber and scrap tires, and to separate the components in composite materials.