Download Work Out Chemistry ‘A’ Level by D. A. Burgess (auth.) PDF
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Additional info for Work Out Chemistry ‘A’ Level
Example text
E. 83°. If no association or dissociation occurred, calculate the relative molecular mass of the alcohol. 86 K kg mol- 1 ). 86°. 83° . 86 .. e. 9 Diffusion of gases Calculate the relative rates of diffusion, under the same conditions, of the gaseous hexa(AEB, 1984, part) fluorides of 235 U and 238 U. (F = 19). Discussion and answer Rate of diffusion ex 30 /1 J~ (from Graham's law) M. of 235 UF 6 = 349 Mr of 238 UF 6 = 352 . Rate of diffusion of 235 UF 6 = .. J 349- Check: the lighter molecules will diffuse faster, so the ratio as written must be greater than unity.
Depression of the freezing point of benzene against concentration of an involatile solute in benzene, assuming ideal behaviour. Bromine (Mr = 160) diffuses through a membrane at the rate of 6 mm 3 s- 1 . How fast would sulphur trioxide (Mr = 80) diffuse, in mm 3 s- 1 , under the same conditions? A3 B~ y2 C 6y2 D 12 E 24 100 cm 3 of methane (Mr = 16) diffuse through a porous partition in 20 s. The same volume of a gas X diffuses in 60 s under the same conditions. 1 Introduction This chapter gives a summary of the main facts of radioactive decay without using calculus.
2 The Periodic Table in terms of valence electrons. 3 Bonds between Atoms Electrons shared between atoms form a chemical bond. If the atoms are of the same kind (as in the H 2 molecule) the electrons will be shared equally on a timeaveraged basis. However, in many cases, there will be an unequal sharing and a resulting poiarity imparted to the bond. In the diagram alongside, atom Y is more electronegative than atom X. Elements of high electronegativity (E/N) are F, 0, Cl, N, in descending order.