In view of the Rutherford model of the atom- is the relative penetrati.docx

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In view of the Rutherford model of the atom, is the relative penetrating power of natural radioactivity to be expected? Explain. Solution Solution: In Rutherford\'s nuclear model of atom entire positive charge and most of the mass are concentrated in the centre. This central part is termed as nucleus. Electrons carrying negative charge revolve around the nucleus in orbits. In view of the Rutherford model of the atom, when alpha particles coming out of a radioactive material bombard the metal foil, many of the alpha particles pass through the metal because most of the part in the target atom is empty. It is also observed that radioactive radiations can penetrate the atoms of different elements and the scattering rate can be low. The reverse is also true by suitable combinations of radioactive radiations and atoms of different elements. Therefore, we can say that the relative penetrating power of natural radioactivity is expected. The alpha particles which collide with the central dense part called nucleus suffer scattering and do not penetrate the nucleus. The atomic electrons being light do not affect the alpha particles. .

In view of the Rutherford model of the atom, is the relative penetrating power of natural
radioactivity to be expected? Explain.
Solution
Solution:
In Rutherford's nuclear model of atom entire positive charge and most of the mass are
concentrated in the centre. This central part is termed as nucleus. Electrons carrying negative
charge revolve around the nucleus in orbits.
In view of the Rutherford model of the atom, when alpha particles coming out of a radioactive
material bombard the metal foil, many of the alpha particles pass through the metal because most
of the part in the target atom is empty. It is also observed that radioactive radiations can penetrate
the atoms of different elements and the scattering rate can be low. The reverse is also true by
suitable combinations of radioactive radiations and atoms of different elements.
Therefore, we can say that the relative penetrating power of natural radioactivity is expected. The
alpha particles which collide with the central dense part called nucleus suffer scattering and do
not penetrate the nucleus. The atomic electrons being light do not affect the alpha particles.

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Inorganic Chemistry - Wurtzite vs. Rock-Salt Structures Beryllium oxide (BeO) prefers the Wurtzite structure type (typical of ZnS) while LiF prefers the rock-salt structure type (typical of NaCI). Why does this happen? Use the following terms/words in your explanation a) ionic radii b) chemical bonding Solution Beryllium oxide prefers wurtzite structure type whereas LiF prefers rocksalt type structure. If we look all these elements, namely, Be, O, Li, and F falls in the second period of periodic structure. Atomic radius decreases from left to right in the periodic table. This is because of addition of an electron in the same shell of the atom which compresses the atom due to more attraction towarrds the nucleus. The electronegativity of elements increases from left to right since it is inverse property of atomic radii. Atomic radius of Be 2+ is less than Li + whereas atomic size of O 2- is more than F - . Moreover, LiF is ionic in natute due to coulombic interaction of highly electropositive atom (Li) and highly electronegative atom (F). On the other hand, BeO is having covalent character along with ionic character in their chemical bond. Thus, BeO prefers wurtzite structure type whereas LiF prefers rocksalt type structure. .

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Is it time for IPI to reconsider its salesforce organization by product line? Solution During the period from August 2, 1989, (date of incorporation) through March 1990, the Company was largely inactive. Since that time, the Company has been engaged principally in research and drug discovery programs and clinical development of a drug compound. On July 25, 1994, the Company acquired all of the outstanding Common Stock of ImmunoPharmaceutics, Inc. (\"IPI\") (now discontinued), a San Diego, California based company, in exchange for Common Stock of the Company. TBC consolidated the IPI operation into TBC in the first half of 1996 The Company is presently working on a number of long-term development projects which involve experimental and unproven technology, which may require many years and substantial expenditures to complete, and which may be unsuccessful. To date, other than small amounts of monoclonal antibody compounds and services produced and sold by ImmunoPharmaceutics, Inc. (\"IPI\") (now discontinued), the Company has not developed or sold any products, and no assurance can be given that the Company will be able to develop, manufacture or market any products in the future. In addition, no assurance exists that future revenues will be significant, that any sales will be profitable, or that the Company will have sufficient funds available to complete its research and development programs or market any products which it may develop. Accordingly, the Company is considered to be in the development stage as it has not to date derived significant revenue from its planned principal operations. .

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INITIALS: 22. Which of the following represents a combustion reaction? A) 2Na(s) + 2H2O(l) ? 2NaOH(aq) + H2(g) B) 2011(g) + 702(g) ? 4CO2(g) + 6H2O(l) C) N2(g) +3H(g) 2NH3(g) D) LiOH(aq) +HNO,(aq)LiNOs(aq) + HO0) E) 2Al(s)+3H SO4(aq)Al:(SO) (aq)+3H:(g) The common constituent in all acid solutions is A) CI B) OH C) H D) H2SO E) H2 23. 24. Which of these properties is/are characteristic(s) of gases? A) High compressibility B) Relatively large distances between molecules C) Formation of homogeneous mixtures regardless of the nature of gases D) A and B. E) A, B, and C. 25. Heat is a measure of thermal energy transferred between two bodies at different temperature. a measure of the change in temperature. a measure of temperature. a measure of thermal energy. A) B) C) D) 26. Thermal energy is A) B) C) D) the energy stored within the structural units of chemical substances. the energy associated with the random motion of atoms and molecules. solar energy, i.e. energy that comes from the sun. energy available by virtue of an object\'s position. 27. An exothermic reaction causes the surroundings to A) decrease its temperature. B) warm up. C) expand. D) become acidic. E) release CO2. Solution 22) in combustion reaction, a compound reacts with O2 to form CO2 and H2O This is correct for option B Answer: B 23) All acid have H+ Answer: C 24) All 3 statements are correct Gas occupy the volume of container. So, there is large distance between molecules Due to this it can be compressed a lot Also gas and gas mixture will always be homogeneous Answer: E Only 1 question at a time please .

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