We started with 80mm of soil in the mason Jar. In some cases, after seperation of the sand, silt and clay, the volume of the soil is greater than 80mm. What could be the cause of this
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We started with 80mm of soil in the mason Jar. In some cases, after seperation of the sand, silt and clay, the volume of the soil is greater than 80mm. What could be the cause of this?
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- Surface agents that prevent particle agglomeration are: A. Pathogens b. foaming C. ATP d. EmulsifiersA batch of raw milk was tested and found to contain a bacterial population of 8xl06cfu/ml. It is to be pasteurised at noc for 33 seconds. The average D value at 52°C for the mixed population is 11 min. The z value is 10°C.i)Explain the terms "D value" and "z value".ii)Calculate how many organisms will be left after pasteurisation.iii)Hpw much time will be needed at 62°C to accomplish the same degree oflethality?iv. How much time will be needed at 82°C to achieve the same degree oflethality?In a town (before 1950) where high amounts of PVC products were manufactured, many people in the town and surroundings, experience sickness due to the toxin agent vinyl chloride, a byproduct of polyvinyl chloride (commonly known as PVC) reaction. Hi, can you elaborate on the following: do you think modern day EPA and Federal regulations (if they were similarly in place in the early 1950’s) would have been effective in countering vinyl chloride toxicity problem before it started to affect individuals, or do you think that even with regulation in place this threat might have occurred the same way? Why? Justify your answer.
- A previous synthesis of CdSe nanoparticles used Cd(CH3)2. You might think that Cd(CH3)2 is similar to the very toxic Hg(CH3)2. Explain why Cd(CH3)2 is not as toxic as Hg(CH3)2 ?Cardenas-Espinosa et al report isolating bacteria through the extraction of soil samples using 0.9% (m/v) NaCl. If you wanted to isolate plastic-eating bacteria, how many grams of NaCl would you need to produce 1.0 L of 0.9% (m/v) NaCl?In a groundwater 1,1,1 trichloroethane, hexachlorobenzene and 1,1,2 trichloroethane have leached from an underground industrial landfill. Which compound would you expect to move fastest with groundwater? Which would be easiest to remove by air stripping? Which would be best to remove by adsorption?
- A 0.2 um pore filter can be used to filter the following and get rid of them except a. viruses b. protists c. fungi d. bacteria BFive grams of a catalyst adsorb 400 cm3 of N2 at STP to form a monolayer. What is the surface area per gram if the area occupied by a molecule of N2 is 16 Å^2What are the uses of Laboratory Apparatus below: 1. Aspirator or Pipette Bulb 2. Evaporating Dish 3. Mortar and Pestle 4. Graduated Pipette 5. Acid Burette 6. Spatula 7. Stirring Rod
- The most likely route of entry for exposure to chemicals is through your nose and mouth. true falsePut (true) or (false) for each of the following statements, then correct any mistake you can notice. A progress of cement hydration could be determined by knowing the amount of insoluble residue during the hydration of cement. B/ The hydration reaction exothermic reaction forming (CSH) products as a result of tw types of reaction, solid state hydration and hydrolysis of compounds in water. C"Portland cement" refers to cement produced by burning clay minerals taken from Portland city in Egypt. D/ Pozzolanic activity could be represented by strength activity index which is determined measuring the quantity of lime (Ca(OH):) in solution in contact with hydrated Pozolar cement. E/ False set is a premature stiffening of cement which results due to several causes 1 plaster set, and carbonation of alkaliesDraw a schematic diagram using this information. Preparation of the solution Take about 25-30 ml of distilled water in a beaker and add powdered crude copper sulphate while stirring the solution so that the powder dissolves. Keep adding the powdered sample till a little of it remains undissolved, even if it is stirred thoroughly. Now add 2-3 ml of dil. H2SO4 to make the solution clear. This prevents the hydrolysis of copper sulphate. Filtration of the solution Take a funnel and fix a filter paper in it and clamp it to a stand. Place a china dish under the funnel. The stem of the funnel should touch the wall of the china dish to avoid the solution splashing out. Pour the solution into the funnel over a glass rod and collect the filtrate in a china dish. The insoluble impurities are left in the filter paper as residue. Concentration of the filtrate to crystallisation point Heat the china dish on a sand bath till the solution is reduced to about one-third of its original volume. To…