Spiking of soil with copper sulphate signficantly affected the survival of subadult C. aspersus snails. Adult specimens exhibited higher mortality percentages at 30, 44, and 70 days (between 46.20% and 60.20%) after being sprayed with 5% and 10% solutions of the same salt (Schwartz and Capatos, 1990). These results clearly show that copper sulfate is highly toxic to land snails. The death rates of controls were similar at 30 and 60 days post-exposure, and as a result, environmental factors appear
Strontium nitrate, the limiting reagent, was poured into the copper(II) sulphate solution, the excess reagent, rather than the other way around. This is a minor systemic error, because even if some of the strontium nitrate remained in its initial beaker, the beaker was thoroughly rinsed out multiple times. The error causes the final mass of the filter paper and precipitate to be slightly decreased, as not all of strontium nitrate reacts with the copper(II) sulfate. This can explain why the percent yield in
important for general health. Brocolli, fruit and veg, cereals Task 2) A) Biochemical food tests method: Benedicts test for reducing sugar: 1. Grind up the sample. 2. Add approximately 2cm3 off the test solution. 3. Add an equal amount of copper, sulphate, sodium citrate and sodium carbonate
SYNTHESIS AND CHEMISTRY OF K2S2O8 ABSTRACT In this experiment, a sample of K2S2O8 was prepared by the electrolysis of an aqueous solution of H2SO4 and K2SO4. The peroxodisulfate anion, S2O82-, was also observed for its ability to serve as a counterion for precipitation by preparing a copper (II) complex by reacting hydrated copper (II) sulfate with ammonium peroxodisulfate in the presence of pyridine. This same ability, coupled with its strong oxidizing ability allowed for stabilization of
of Matter Molecule= 2 or more atoms chemically bonded. 2) Describe paper chromatography. 3) Interpret simple chromatograms. A method used to separate a Solution, using a Paper and a beaker of water. The Substances in the Paper go up depending on their Mass. We can say that a Solution has the same substance as another solution because they form a line of the same height. 4) Describe methods of separation and purification: filtration, crystallisation, distillation, fractional distillation
Although it did take some time, when red litmus paper was placed in the solution, it changed blue in colour, therefore highlighting that hydroxide ions are present in the solution. Station four can clearly be identified as a combination (redox) reaction, as a new product is synthesised by the combination of two reactants. The reactants, calcium and water combine together to
While working in SIMDS, I was expected to know how to correctly dispose of the different waste products within the laboratories to maintain a clean and safe environment. The disposal system consisted of three main bin types. These included the biological contamination bins, chemical waste bins, sharps bins, confidential waste bins and the domestic waste bin. All these different types of bins were expected to contain a specific items. Each bin is designed to contain its own waste material. For example
Experimental: 1. Synthesis of alkyl azide (I-IV Scheme-1) To a stirred solution of alkyl chloride in DMSO (10ml) was added sodium azide (1.2 equivalent) at 80oC. The reaction mixture was stirred for overnight. After completion of reaction the solvent was distilled off and water was then poured into reaction mixture. The solid residue was filtered and filtrate washed with chloroform three times. Filtrate was dried over anhydrous Na2SO4 and solvent was distilled off leaving pure white solid crude compound
m=nM 707511097 x (65.37+32.06) =6.89x10^11grams / 1x10^6= 689328.056 tons of ore =689,328 tons of Zinc ore required for 250,000 tons of Zinc metal, therefore the waste is calculated by 689,328 – 250,000=439328 tons wasted (439,328 tons) which are copper, lead and iron. This is 689,328/250,000= 2.757 tons of zinc ore per ton of zinc metal, 1000/2757 = 36.3% of zinc ore becomes zinc metal Pollutants are Sulfur dioxide, Nitrogen oxide, Pm10 particles (Big particles in the air, dust ,matter, etc.) And
temperature. Ho :- The different temperature will have no effect on the fish flake food. 2. Method First of all the solution Copper Sulphate (CuSO4) was made into a solution using 2.49g CuSO4 in 100ml of water. Then 0.52g of the fish flakes was weighed out and placed into the pestle mortar and grinded up, which 10ml of distilled water was then added to make a solution. Once the solution was made it was then divided equally into five centrifuge tubes and spun for 5 minutes each time in the centrifuge