Question mark products

Question mark products In these cases the company must decide whether to increase the market share (turn them into star products) or to abandon them if the prospects are slim. 

Study the unlabelled block diagram, and then replace the question marks with the words and phrases to give a generalised scheme of an industrial fermentation. Assume in this example that the product is excreted from the microbial cells. 

Before the equation is balanced, there are no coefficients for any reactant or product after the equation is balanced, the absence of a coefficient implies a coefficient of 1. To prevent ambiguity while you are balancing the equation, place a question mark before each substance, and replace the question mark as you figure out each real coefficient. After you get some practice, you will not need to use the question marks. 

Step 1 Write down the formulas for reactants and products. Add question marks. 

The yield of 8-oxo-Ade from Ade has been reported to be the same in the absence of O2 or in air-saturated solution, but is increased in the presence of small amounts of Fe(CN)63- (saturation level already at 4 x 10-6 mol dm-3 Dias and Vieira 1997a,b), putting a question mark behind the suggestion (Vieira and Steenken 1991 Dias and Vieira 1997a) that in the presence of 02 this product is formed by the elimination of 02- from the C(8)--OH-adduct peroxyl radical. 

The compound of Micheel and Micheel was obtained in small amount after treatment of 2,3,4,6-tetra-O-acetyl-a-D-mannosyl bromide with tri-methylamine the bulk of the material remained unchanged. The product apparently resulted from hydrolysis by moisture from the air. The composition was established by analyses, but the identification was reported with a question mark. A 2,3,4,6-tetra-O-acetyl-D-mannose with different physical constants (m.p. 93°, [c ]d +26.3°) was obtained by Levene and Tipson63b by the deliberate addition of water and silver carbonate to tetra-O-acetyl-D-mannopyranosyl bromide its structure was confirmed by conversion to the known pentaacetates. If Micheel and Micheel were correct in their identification, the two acetates could be anomers. The acetylation and deacetylation reactions performed by Maurer and Bohme are additional evidence in favor of this relationship. 

On the whole it is easier to use the saturated 1,5-diketone and oxidize the product to the pyridine. As we are going from a nonaromatic to an aromatic compound, oxidation is easy and we can replace the question mark above with almost any simple oxidizing agent, as we shall soon see. 

Write the given information under the appropriate reactants and products. Put a question mark under the reactant or product for which information is needed. 

Fig. 6.16 Reactions of hydroxyl radicals with an organic substrate M in the presence of bicarbonate leading to a diversity of oxidized products Mf"" (following Hoigne, 1998). The subscript / denotes different product molecules and the question mark denotes the complex reactivity of intermediary tetroxides (see Figures 6-17 and 6-18), and other competing decomposition pathways.

First, write the correct formulas for the reactants and products, place a 1 before the most complicated-looking formula, and place a question mark before every other formula ... 

Ans. Step 1 Write down the formulas for reactants and products. Assume a coefficient of 1 for a complicated reactant or product. Add question marks ... 

To convert this word equation into a formula equation, use the formulas for the reactants and for the products. The formulas for methane, oxygen, carbon dioxide, and water replace the words in the word equation to make a formula equation. The word methane carries no quantitative meaning, but the formula CH4 means a molecule of methane. This change gives the unbalanced formula equation below. The question marks indicate that we do not yet know the number of molecules of each substance. 

Replace each question mark as you figure out each coefficient. If an element appears in more than one reactant or product, leave that element... 

First, assume a coefficient of one for the most complicated reactant or product and insert question marks for the other coefficients ... 

Solution Start by writing the correct formulas for all reactants and products. Put question marks in the place of all the coefficients except the most complicated substance (ZnCI, ) put a 1 in front of that substance. 

The fact that monitored dosage packs are useful to elderly compliance does not appear to be in dispute. However, there are certain question marks against the direct admixture of several products, e.g. whether checking this is a development, clinical, medical, stability/analytical function has to be decided. Most of the packs used are based on plastics. 

Complete each of the following reactions by supplying the missing reactant or product as indicated by a question mark ... 

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