STP is burned? (at STP‚ the volume of 1 mol of any ideal gas is 22.414 liters) 17. The human body is 0.0040% iron. How many milligrams of iron does a 64 kg person contain? 18. How many H atoms are present in 23.6 g of urea (NH2)2CO‚ which is used as fertilizers? Given 1 mol of urea has a mass of 60.06 g. 19. Complete the table for some of the elements occurring naturally. Element Sodium Scandium Arsenic Gold Symbol Na Sc As Au 21 79 Proton number Nucleon number 23 Number of neutrons 12 24 42 118
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the nephron and the collecting duct : blood plasma in fluid in nephron renal artery fluid in collecting duct Percentage of protein Percentage of urea Percentage of substance X (i) Explain the difference in the concentration of protein between the blood plasma and the fluid in the nephron. (2 marks) (ii) What process causes the increase in urea concentration along the collecting duct ? (1 mark) (iii) (1) What may substance X be ? (1 mark) (2) Explain the change in the
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acidophile. Not only can E. coli withstand the acid of the gastrointestinal tract‚ but it thrives in that environment. The results of groups SU-1 and SU-2 vary too much to draw a verified conclusion. Since Sporosarcina ureae is usually isolated from urea‚ it could be concluded that Sporosarcina ureae is an alkalophile. There was only one group’s results for Saccharomyces cerevisiae. According to group SC-1’s results‚ it would seem that Saccharomyces cerevisiae is a neutrophile growing best at a pH
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are pure substances. The fact that they are pure substances means that the solid has an organized structure (strong); the bonds will therefore be harder to break causing the melting point of the components to be higher and sharper. 3. Salt or urea dissolves in water as ions of chlorine and sodium .The ions either hydrate or join as a part of the water molecules‚ producing heat on icy surfaces to thaw the ice. Conclusion It can be concluded that the melting point of the substances: naphthalene
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Brook trout blood was used throughout our experiment as our erythrocyte suspension‚ which consisted of ten drops of fish blood in a test tube containing 10mL of 0.7% NaCl. Eleven other solutions‚ (erythritol‚ xylose‚ monacetin‚ diacetin‚ triacetin‚ urea‚ thiourea‚ glycerol‚ ethylene glycol‚ glucose and fructose) all isosmotic but not necessarily isotonic with the cytoplasm of the erythrocyte‚ were combined with a 0.2mL of well-mixed stock suspension were added to 0.27M of each solution‚ one at a time
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Not since German chemist Friedrich Wöhler demonstrated in 1828 that an organic compound‚ urea‚ could be synthesized from inorganic precursors‚ ammonium and cyanic acid (Kinne-Saffran and Kinne‚ 290)‚ has the line between organic and inorganic or‚ in this case‚ biology and chemistry‚ been blurred as it has been in Addy Pross’ book What is Life? How Chemistry Becomes Biology. In it‚ Pross dispels the traditional belief that life’s evolution and origin must be subdivided into a chemical phase followed
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The skin is the largest organ in our body. It is made up of 3 layers. The epidermis‚ dermis and the subcutaneous tissue. The epidermis layer is the skin’s outermost layer. It consists of 5 layers: : stratum basale‚ stratum spinosum‚ stratum granulosum‚ stratum licidum and stratum corneum. The dermis layer consists of the papillary layer and reticular layer that contain collagen fibers. The subcutaneous tissue is a layer of fat and connective tissues where blood vessels and nerves can be found
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An assignment on Brood Management of Indian Major Carps and Chinese Carps Course Title: Brood Management and Breeding Technique Course no: AQUA- 5105 Credit Hours: 3.0 ACKNOWLEDGEMENT At first all praise to the almighty Allah. We express our heartiest gratitude to Dr. Khandaker Anisul Huq‚ professor and head‚ Fisheries and Marine Resource Technology Discipline‚ Khulna University‚ who has offered us such an assignment‚ which is most informative and essential for us as the students of
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Introduction The science of microbiology is all about microorganisms‚ what they do and how they work. Microorganisms are ubiquitous‚ and are a very important part of life everywhere since they have been around for billions of years. The two main themes associated with microbiology are (1) having an understanding of the nature and function of the microbial world‚ and (2) being able to apply that understanding of the microbial world so that the benefits to the Earth and humans are known(6). This lab
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Internal Combustion Engines for the Future Horst Schulte‚ Martin Wirth Ford Motor Company ABSTRACT Future internal combustion engines for light duty applications will have to cope with a very complex set of customer‚ legal and business requirements. Customers are expecting further improvements in durability‚ reliability‚ drivability‚ fuel economy‚ and cost of ownership. Legal requirements are focused on significant emission and fuel consumption reductions. Additional manufacturing cost reductions
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