Downward-displacement

Downward displacement operator, 399 Drell, S. D., 724 Druyvesteyn distribution, 49 Druyvesteyn, M. J49 Dual problem in linear programming, 304... 

The above processes, other than the action of the dispersive forces, can result in an upward or downward displacement of an individual particle, there being approximately equal chances of the net force acting upwards or downwards. However, because the gravitational force gives rise to a tendency for the concentration of particles to be greater tit the bottom of the pipe, the overall effect is to lift the particles. 

In this investigation, you will determine reaction rates by recording the time taken to produce a fixed volume of CO2. You will collect the CO2 by downward displacement of water. 

Assemble the apparatus for the collection of CO2, by downward displacement of water, as shown below. 

Option 1 You can collect the oxygen gas by downward displacement of water. Collect the oxygen produced in the first 60 s of the reaction in an upside-down graduated cylinder. Refer to Investigation 6-A to see how to set up an apparatus for collecting the gas. 

These results suggest that the most significant relaxation of the ZnS (110) surface is a downward displacement of the surface Zn atoms by approximately 0.02 nm. The surface S atoms relax out the surface by about 0.01 nm. The band structure and partial density of state (PDOS) of relaxed ZnS (110) surface are illustrated in Fig. 9.13. The atomic and bond overlap population analysis of ZnS (110) surface is listed in Table 9.6. It shows that the band gap of ZnS (110) surface is 1.5 eV, and it is smaller than that of bulk ZnS. The reason for band gap... 

Figures 2.93,2.94 and 2.95 illustrate apparatus employed for the extraction of aqueous solutions by solvent heavier than water such as dichloromethane or carbon tetrachloride (liquid-liquid extraction by downward displacement).

All these halides come over as gases, and may either be collected over mercury or by downward displacement, i.e. by delivering them to the bottom of a jar containing air, which owing to its less density is forced upwards, and escapes at the mouth of the jar. They cannot be collected over water, for they are readily soluble in it. 

Ammonia is collected by downward displacement of air as shown in Figure 13.4. Because the preparation of ammonia gas requires a gentle heating of the reactants, the reaction chamber cannot be an ordinary bottle. Instead a test tube must be used. As the ammonia is collected, the air already in the... 

Results Bubbles of gas began to appear and collected around each of the strips of aluminum foil. The gas collected at the top of each test tube by the principle of Downward Displacement of Water. The amount of gas in one test tube was about twice that in the other test tube. 

Experiment 61. — Construct and arrange an apparatus like Fig. 52 to collect the gas. The apparatus shown in Fig. 55 is used to prepare a solution of the gas, and is the same as shown in Fig. 52, except that B passes into the absorption apparatus, FG. Instead of F, the apparatus //. shown in Fig. 56, may be used. The flask A stands on a sand bath, and the gas is collected in D by downward displacement, exactly as in the collection of chlorine. 

The test tube A is clamped to an iron stand at such a height that the end of C reaches to the bottom of a bottle in which the gas is collected by downward displacement and the solution subsequently prepared. 

Displacement, n. Collection of a gas by allowing jt to fall or rise into a vessel. The former method is downward displacement, the latter is upward displacement. Substitution of one element for another in a compound replacement. 

FIG. 6-1. Pouring hydrogen from one bottle to another, with downward displacement of air. 

Hepatomegaly can easily be ascertained by palpation and percussion its size can also be well assessed. Asthenic patients may display simulated liver enlargement, (s. pp 77, 78) In addition to the typical dextral elevation of the diaphragm in hepatomegaly, there is often a downward displacement of intestinal loops as well. 

Air removal and steam admission. Air can be removed from steam sterilizers either by downward displacement with steam, evacuation or a combina-... 

A Woulfs bottle is taken and some pieces of granulated zinc are placed in it. Then a thistle funnel is fitted in one mouth and in the other mouth a delivery tube is fitted. Some water is added to cover the zinc pieces. Then cone. H2S04 or HQ is through the funnel. The hydrogen gas coming out of the Woulfs bottle through delivery tube is collected by downward displacement of water. 

The catalytic activity of the components of the spinel system Cui.x x] Cr04 was studied for decomposition of hydrogen peroxide. 0.5ml of 30% H2O2 in 4.5 ml of distilled water was taken in flask, a 50 mg of the above catalyst was added. The flask was kept in constant temperature bath. The amount of oxygen liberated as a function of time was measured by downward displacement of water from the inverted burette. Burette was connected to reaction flask by rubber tubing. Each composition of the system was studied for the catalytic behaviour for three different temperatures. 

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