Saturday, February 29, 2020
Biological oxygen demand (BOD) of water sample analysis
Biological oxygen demand (BOD) of water sample analysis Essay ââ¬â The first end point colour was of a yellow colour, perhaps not light enough ââ¬â Addition of starch indicator produced a grey-black solution; perhaps did not add enough indicator, however this did not pose as a problem ââ¬â There was one occasion where I suspected to have added too much sodium thiosulphate, however the second trial indicated that I did not go past the end point too much To calculate the dissolved oxygen content (mg/dmà ³ or ppm), we must first determine the number of mols of thiosulphate from the mean titrated volume of both samples. In this case, we will use sample A. The Winkler method indicates that the relationship between the amount of oxygen and thiosulphate is a four to one ratio. Therefore, we will divide the number of mols of thiosulphate by four to get the number of mols of oxygen. Then we convert this to milligrams per dmà ³ first by multiplying by 20 to arrive with the number of mols present in 1dmà ³ (because the pond water sample used was 50cmà ³). Then we multiply that number by 32 (molecular mass of oxygen) to attain the number of grams of oxygen. Then finally, the number is multiplied by 1000 to be converted into milligrams. The biological oxygen demand (BOD) would therefore be the difference between the DO of sample A and sample B. Biological oxygen demand (BOD) of water sample analysis. (2017, Nov 17).
Thursday, February 13, 2020
The Developing Child Essay Example | Topics and Well Written Essays - 1250 words - 1
The Developing Child - Essay Example An understanding of a childââ¬â¢s development is significant since it gives an insight into the cognitive, bodily, emotional, social, and educative development that a child undergoes. The major theories attempt to describe every aspect of development using models. The theory shares a school of thought that children are born with a hereditary aptitude to learn any human language. He further maintains that particular linguistic configurations, which children use so perfectly, are already embossed on the childââ¬â¢s intellect (Socha, 2010). Child A understands the use of different objects that he is familiar with. He even uses sound effects for his car during their play with Child B, mainly because he understood the particular configuration of a car including the sound it makes when in motion. It was evident that Child A went ahead to add two big pieces to his model and alerted Child B about his new model, the airplane. Clearly, Child A is so accurate in his design and uses previous experience to affirm his involvement. Secondly, Chomskyââ¬â¢s theory explains that there exists a language acquisition device or LAD in every childââ¬â¢s brain, which is responsible for encoding the major principles of a language, and its grammatical structures. Every child uses LAD to form simple sentences during a conversation (Saxton, 2014). In the context, it is evident that Child A can use simple sentences when speaking, and does use link words in his sentences. The ability to use simple sentences confirms that the child is already aware of the basic sentence construction, and therefore, uses it to instruct Child B to run away from the monsters. This confirms the childââ¬â¢s grammatical understanding. Thirdly, Chomsky informs that a child doesnââ¬â¢t probably learn a language through mimic only, because the language that people around them speak is extremely lopsided.
Saturday, February 1, 2020
Rhetoric Principle Essay Example | Topics and Well Written Essays - 250 words
Rhetoric Principle - Essay Example It is, therefore, wise for employed people to invest and if they do not do so now, they will wallow in poverty and desperation alongside those who never had employment or invested. There are many areas in which a person can invest including entrepreneurship, shareholding, real estates, agricultural activities, and banking among others (Gray, 1983). The good news is that at least, every person can find an area of interest in investment options. These options also fit in a variety of jobs one does (Domini, 2011). Moreover, everyone can easily investment in an economic activity that fits his or her timetable, financial status, social status and cultural orientation. Therefore, there will be no reason to justify if a person is abandoned by his children to wallow in poverty in old age when he should have laid a strong financial foundation by investing. There is also no reason for one to claim that he or she was not employed given the loan packages that financial institutions offer all over at interest rates that even lay people can
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