The theoretical yield for Zinc Sulfide is 0.49 grams but the actual yield is 0.38 grams. So if 0.38 is divided by 0.49 and multiplied by 100 then the percent yield for Zinc Sulfide would be 77.6%. When it comes to Sodium Chloride, the theoretical yield is 0.58 grams and the actual yield is 0.45 grams. So when 0.45 grams is divided by 0.58 grams and multiplied by 100, the percent yield would be 77.5% of Sodium chloride. The actual yield is directly taken from the mass of the products in the experiment while the theoretical yield is determined by using stoichiometric calculations.
The resulting molten material is called the blister and contains about 99% copper by mass. (Cavette, 2007) Refining The copper blister is 99% copper but it still have a higher level of sulfure, oxygen some other impurities and by the reason it has to be further refined in order to purifies the cupper, this done by fist firing refined before it is sent to the final electro fining process • The blister copper is heated in in the refining furnace that is similar to the converter ,air is blown into the molten blister to oxides the impurities and a sodium carbonate is added to remove traces of arsenic and the antimony, • The blister copper is heated in a refining furnace, which is similar to a converter described above. Air is blown into the molten blister to oxidize some impurities. A sodium carbonate flux may be added to remove traces • Then the purified copper in then poured into the molds to form large electric
Temperature (Magnesium) 25oC ±0.5 = 0.5/25 x 100= 2% Δ Temperature: (Tf – Ti) 0.5/98.82 x 100 = 0.5% 55.7 – 25 = 73.8 2% + 0.5% = 2.5% (of 73.8) = ±3.38oC Similarly evaluate other uncertainties By plugging in these values in the formula we can find energy released by the reaction: Q Magnesium= (25g) x (4.18) x (73.8) = 7714.2 Joules (J) = 7.714 Kilojoules (kJ) Absolute Uncertainty: Volume: 0.3/25 x 100 = 1.2% Energy uncertainty = 1.2% + 2.5% = 3.7% (of 7.71 kJ) = ±0.29 kJ Using the average mass of every metal used, we can find the number of mols through the formula n=
The electrochemical behaviour of copper-1,10-phenanthroline (phen) complex in aqueous and in water-acetone mixed solutions was studied by CV-thin layer spectroelectrochemistry. In aqueous solution, [Cu(II)(phen)2]2+ complex electrochemically reduced to [Cu(I)(phen)2H2O]+ with maximum absorption at 405nm, and followed by a reversible chemical reaction. The formal potential, E0=0.078V, the number of electron transferred, n=1.0, and the equilibrium constant of the following chemical reaction, K=0.107 (0.005), were determined. In water-acetone mixed solution, [Cu(II)(phen)2]2+ reduced to [Cu(I)(phen)2]+ with maximum absorption at 435 nm. Keywords: CV-thin layer spectroelectrochemistry; copper-1,10-phenanthroline complex 1.
Also, BASF markets have a product called Ecovio® (blend of PLA and the company's biodegradable plastic Ecoflex®). The thin plastic films such as trash bags or even shopping bags are the common application of this biodegradable polymer. Finally, there are many advantages the usage of biodegradable polymer to particular application depend on the properties of the biodegradable polymer that fits that
Calcium is a chemical element, that has the symbol Ca. Its atomic number is 20. Calcium is an alkali-earth metal, which means it builds oxides, that react with water. It's natural state in solid. Calcium's melting point is 842°C, 1548°F, 1115 K and boiling point is 1484°C, 2703°F, 1757 K. Calcium is a silver-white soft metal, that reacts to halogens, water, and acid.
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Balanced Chemical Equation: Cu(OH)2 (s) + Heat —> CuO (s) + H2O (g) Reaction 4: when a sulphuric acid is added to the solution that contains copper (II) oxide, a double displacement reaction will occur. the copper (II) oxide will react with the sulphuric acid producing copper (II) sulfate and water. The copper and hydrogen gas replace each other. Balanced Chemical Equation: CuO (s) + H2SO4 (aq) —> CuSO4 (aq) + H2O (l) Reaction 5: when zinc is added to the copper (II) sulfate solution, a single displacement reaction will occur. The zinc will form a new compound with the sulfate, and the copper will stay as a metal.
English scientist Sir William Crookes discovered thallium in 1861. Atomic number for thallium 81g, atomic weight 204.383g . him The melting temperature of 303.5 °C, while boils at a temperature of 1457 ° C. And its density is 11.85 g / cm² at 20 ° C class The metal thallium is highly toxic to humans. As the feature is a cumulative effect, it increases with the passage of time. And exposure to a lot of this element may cause some diseases and suspected thallium potential carcinogenic to humans.