Is this true

Can certain materials (polyol ns vnth additives) be sometimes called compostable Is this true  

No They may eventrtally pass several tests required by NF EN 13 432, but in no case the biodegradability test 

From an environmental point of view, this kind of statement has no meaning. It is always necessary to refer to the conditions determining this biodegradability . 

Incubation medium Temperature What level of biodegradation was reached and during how much time Is the biodegradation absolute or relative to cellulose  

we must always specify the compostability conditions, i.e. by saying my product is compostable according to norm NF EN 13432 or even my product complies with norm NF EN 13432 and can be declared biodegradable by composting imder industrial conditions or even by consulting a known mark of conformity that refers to the same norms ad hoc. 

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It is important to note that the experimentally defined or apparent adsorption no AN 2/, while it gives F, does not give the amount of component 2 in the adsorbed layer Only in dilute solution where N 2 0 and = 1 is this true. The adsorption isotherm, F plotted against N2, is thus a composite isotherm or, as it is sometimes called, the isotherm of composition change. 

In recent years the old quantum theory, associated principally with the names of Bohr and Sommerfeld, encountered a large number of difficulties, all of which vanished before the new quantum mechanics of Heisenberg. Because of its abstruse and difficultly interpretable mathematical foundation, Heisenberg s quantum mechanics cannot be easily applied to the relatively complicated problems of the structures and properties of many-electron atoms and of molecules in particular is this true for chemical problems, which usually do not permit simple dynamical formulation in terms of nuclei and electrons, but instead require to be treated with the aid of atomic and molecular models. Accordingly, it is especially gratifying that Schrodinger s interpretation of his wave mechanics3 provides a simple and satisfactory atomic model, more closely related to the chemist s atom than to that of the old quantum theory. 

You should always use the lift/elevator to leave a buildin0 quicKl where the fire alarm has sounded. Is this true 6rive reasons for (Our answer. 

Problem 4. Some authors claim that in most cases it is better to destroy an object than give it a salvage value. Is this true for Example 1 1-5 ... 

In many polymers, degradation begins at defects in the polymer chain. Why is this true ... 

Cahill I have a question relating to the human variants. If you have both a photopigment and a photoisomerase that are necessary for the response, you shouldn t be able to get a univariant action spectrum. Is this true I thought you were suggesting the possibihty that the reason the melanopsin knockouts had a subtle effect was that melanopsin was necessary as a photoisomerase. 

Even if we discount international comparisons, however, it sometimes seems as though schools are still doing a worse Job today than they were in 1950. Is this true No, it s not. Let s look first at domestic standardized test scores. In 1995, 757o more students ecored above 650 on the SAT Math test than in 1941. If you factor out the Asian-American population, 57% of African-American, Hispanic, and white students did better on the SAT Math in 1995 than in 1941. The norms for the SAT Math test were the same between 1941 and 1995, so the higher scores are comparable. Test scores on the ACT college entrance exam have also increased each of the last three years. 

Bioceuticals are supposed to be generally more biodegradable - but is this true even after denaturation, for example, in effluents of low or high pH Blood stains on textiles teach the opposite. 

Exercise 2.15 (Used in Proposition 11.1) Suppose V is a finite-dimensional complex vector space. Show that V = (y ), (See Exercise 2.14 for a definition of the dual V. ) Is this true for all complex vector spaces ... 

The theory of phlogiston did not appeal to all of Stahl s contemporaries. Notably is this true of two of the most popular chemistry teachers of the time, Hermann Boer-haave at Leyden and Friedrich Hoffmann of Berlin. Both of these men accepted the idea of Beclier s predecessors that combustion consisted in the loss of some substance, sulphur (sometimes called phlogiston by Hoffmann), oil (oleum) or pabulum ignis (the food of fire). by Boer-... 

The CGMPs require that production procedures be written for any support activity that is repeated within a CGMP environment (21 CFR Subpart F-Production and Process Controls, Written procedures deviations ). Why is this true Simply because validation is about proving that something performs the same task in a consistent manner. Validation requires consistency. Likewise, procedures that are followed assure consistency. It should therefore be no surprise that operational procedures are written and executed repeatedly. The ultimate test for the validity of written procedures is the acceptability of the final, validated product. 

A mission or purpose for living provides direction at any age. Even a small one can provide focus, dissipate much uncertainty, and make each day an upbeat experience. All of this is just as important after retirement as before, and is a necessity to become a master senior. Why is this true ... 

What are the toxicological characteristics of formaldehyde In what sense is the toxicological chemistry of formaldehyde unique What is formalin How is it related to formaldehyde What metabolic phenomenon suggests that formaldehyde is not very toxic Is this true ... 

In which line of the table used to calculate the equilibrium concentrations are the values in the ratio of the coefficients of the balanced chemical equation Is this true in other lines ... 

One of the best indications of a useful theory is that it raises more questions for further experimentation than it originally answered. Is this true of Dalton s atomic theory Give examples. 

If you have any two gases in different containers that are the same size at the same pressure and same temperature, what is true about the moles of each gas Why is this true ... 

If I read the table correctly, there was a difference of about six orders of magnitude in the rate constants for the NO3 reactions. Is this true It must require an extraordinary measurement technique. Is it quite credible ... 

The specific heat varies most rapidly with the temperature in the case of non-metals of low atomic weight. Particularly is this true of carbon, above all in the non-conducting crystalline form of diamond. The specific heat of diamond increases from 01128 to 046, that is to say, about four-fold in the interval between 0° and 1000°. 

The Gp. IVA transition elements, titanium, zirconium and hafnium all have the [n — l)d2ws electron configuration. They differ from the transition elements of the later groups in their tendency to form compounds to the exclusion of those in which lower charge numbers occur especially is this true of Zr and Hf. 

Now, is this true How can we tell whether or not the rate at which halide ion is lost affects the rate of elimination We might consider looking for an isotope effect, as was done in aromatic nitration. But here that would be a very difficult Job. We are not dealing with loss of hydrogen, whose isotopes differ two- or three-fold in mass we are dealing with loss of elements like chlorine, whose isotopes differ by only a few percent, with correspondingly small differences in the ease with which bonds are broken. 

To answer this question, suppose you test the electrical conductivities of 0. lOM aqueous solutions of hydrochloric acid and acetic acid using a conductivity apparatus similar to the one shown in Figure 19-7. When the electrodes are placed in the solutions, both bulbs glow, indicating that both solutions conduct electricity. However, if you compare the brightness of the bulb connected to the hydrochloric acid solution with that of the bulb connected to the acetic acid solution, you can t help but notice a significant difference. The 0. lOM HCl solution conducts electricity better than the 0. lOM HC2H3O2 solution. Why is this true if the concentrations of the two acids are both 0.1 OM ... 

Because CFCs appear to play a role in the process of ozone destruction, many countries have stopped manufacturing and using these compounds. It will take many years, however, before the concentration of ozone in the stratosphere returns to its former levels. Why is this true ... 

Is this true Certainly not for many results. Very few (if any) scientists disbelieve the Krebs-cycle, describing energy transport in cells, or the Calvin-cycle, describing photosynthesis, or DNA/RNA chemistry as the very base of genetics. 

Before a reaction can start, molecules of the reactants have to bump into each other, or collide. This makes sense because to form new chemical bonds, atoms have to be close together. But, not just any collision will do. The collision must be strong enough. This means the reactants must smash into each other with a certain amount of energy. Anything less, and the reaction win not occur. Why is this true ... 

Show numerically that the molality and molarity of 1.00 X 10 4 aqueous sodium chloride are nearly equal. Why is this true Would this be true if another solvent, say acetonitrile, CH3CN, replaced water Why or why not The density of CH3CN is 0.786 g/mL at 20.0°C. 

Some would see a 50% decrease followed by an 80% increase and would take a 30% increase. Is this true Photocopy the original 10 cm x 10 cm square with a 30% enlargement on. Did you get the same result ... 

Carbon-nitrogen single bonds are freely rotating however, amide carbon-nitrogen bonds are much more rigid. Why is this true What effect does this property of amide bonds have on the shapes that proteins can assume ... 

Examples 15.6 and 15.7 indicate that the root locus has as many branches as the number of poles of the open-loop transfer function. Thus, in Example 15.6 the open-loop transfer function has two poles and the root locus two branches, whereas for Example 15.7 we have four poles and four branches. Is this true for any closed-loop system Explain. 

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