Concept explainers
(a)
Interpretation:
The general reaction occurring between the sizing agent and cellulose at
Concept introduction:
Cellulose is a straight-chain polysaccharide. It is composed of many units of glucose which are joined by glycosidic linkages. Cellulose is the most abundant organic
(b)
Interpretation:
The reason so as to why the treatment of cellulose with
Concept introduction:
Cellulose is a straight-chain polysaccharide. It is composed of many units of glucose which are joined by glycosidic linkages. Cellulose is the most abundant organic polymer on earth.
(c)
Interpretation:
The reason so as to why the treatment causes the paper to be slightly alkaline is to be stated.
Concept introduction:
Cellulose is a straight-chain polysaccharide. It is composed of many units of glucose which are joined by glycosidic linkages. Cellulose is the most abundant organic polymer on earth.
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Organic Chemistry
- What bond connects the monomer units in cellulose: amide, acid, ether, ester, or alcohol?arrow_forwardIn reference to cloth or fiber, the term acetate usually means cellulose acetate, a semisynthetic polymer made by treating cellulose with acetic anhydride. Cellulose acetate is spun into yarn by dissolving it in acetone or methylene chloride and forcing the solution through spinnerets into warm air, where the solvent evaporates. Explain why cellulose acetate is soluble in organic solvents, even though cellulose is notarrow_forward(a) What is the empirical formula of cellulose? (b) Whatis the monomer that forms the basis of the cellulose polymer?(c) What bond connects the monomer units in cellulose:amide, acid, ether, ester, or alcohol?arrow_forward
- What is the main structural difference between amylose and cellulose?arrow_forwardDefine about Cellulose ?arrow_forward5. Ribose's structure is ОН HO ОН ОН a) Draw using the arrow formalism the reaction of linear ribose to make a 5-membered ring. b) What is the name of the resulting functional group? c) Given that reaction of alcohols (such as RCH2OH) with carbonyls (such as HCO-R') to create this functional group is typically not thermodynamically favored, why does most ribose in water exist as a 5-membered ring? A few word answer is fine. d) AG°for this reaction is about - 5 kJ/mol. Assuming that you start with a 1 mM solution of ribose in water, what is the approximate concentration at equilibrium of (i) the linear form? (ii) The cyclic form? (A good answer should be correct within 20%, e.g. it is fine to approximate 9 mM as 10 mM, but it is not okay to approximate 0.1 mM as 1 mM.) e) This reaction creates a new stereocenter. Please indicate it with a *. f) Consider the starting point for synthesis of purines like ATP, which is PRPP (pheseboribosylevOrhesehate) НО НО LOLOH HO ОН HO OH Pyrophosphate…arrow_forward
- In what ways are cellulose and amylose similar? How do the structures of cellulose and amylose differ?arrow_forwardSketch the structures of ribose and deoxyribose ‐‐‐ what is the structural difference? Which nucleotides are associated with DNA? Which ones with RNA? Why must detergent be added to liberate the DNA? What parts of the cell contain DNA?arrow_forwardIn general, the starch hydrolysis reaction can be written as (C6H10O5)n + H2O -> (C6H10O5)n-1 + C6H12O6, where one glucose is produced for every water added. Because of the addition of water, the mass of the glucose monomer increases during hydrolysis from approximately 162g/mol in the starch polymer to 180g/mol as free sugar. The glucose, in turn is converted to ethanol by the yeast, Saccharomyces cerevisiae, according to the reaction, C6H12O6 -> 2 CO2 + 2 C2H5OH. The starch in 25kg (~1 bushel) of corn is hydrolyzed and in the process 1.8kg of water (H2O) is consumed. How many moles of glucose (C6H12O6) would you expect to be produced? If the glucose from the above hydrolysis is fermented, how many moles of ethanol (C2H5OH) would result? How many grams?arrow_forward
- Poly(vinyl alcohol), PVA, is produced from poly(vinyl acetate) by converting the acetate groups into hydroxyl groups (Section 26.6a.1). As the number of hydroxyl groups in PVA increases, the solubility of the polymer in water decreases. How do you explain this behavior?arrow_forward6. Nylon-11 is poly(Ω-aminoundecanoic acid). In the polymerization of Ω-aminoundec-anoic acid, H2N(CH2)10COOH, to produce this polymer, what weight fraction of the reaction mixture will have the structure –[-NH–(CH2)10–CO-]100– when 99% of the functional groups have reacted ?arrow_forwardHow does polyimides behave in acidic media?arrow_forward
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