Kimya Ödev Yardımı
QuetionAI‘nin kimya problemi çözücüsü, temel kimyasal reaksiyonları ve denklemleri kullanıcılar için gerçek zamanlı olarak özetleyebilen ve zayıf bir temele sahip öğrencilerin bile kimyada kolayca uzmanlaşabilmesi için güçlü bir öğrenme sistemine sahip olan bir ortaokul kimya ders aracıdır.
Artık periyodik tablonun temel özellikleri hakkında endişelenmenize gerek yok. Burada her elemente karşılık gelen kimyasal reaksiyonlara ve reaksiyon prensiplerine kolaylıkla ulaşabilirsiniz. Moleküllerin ve atomların orijinal yapısını, görülebilen makroskobik olaylardan çıkarmak, her zaman savunduğumuz bir kimya araştırma tekniğidir.
- REVIEWING MAIN IDEAS 1. What is a chemical bond? 2. Identify and define the three major types of chemical bonding. 3. What is the relationship between electronegativity and the ionic character of a chemical bond? 4. a. What is the meaning of the term polar as applied to chemical bonding? b. Distinguish between polar-covalent and nonpolar-covalent bonds. 5. In general, what determines whether atoms will form chemical bonds? __ PRACTICE PROBLEMS 6. Determine the electronegativity difference, the probable bond type, and the more-electronegative atom with respect to bonds formed between the following pairs of atoms. (Hint:See Sample Problem A.) a. Hand I b. Sand O C. Kand Br d. Si and Cl e. Kand Cl f. Se and S g. Cand H 7. List the bonding pairs described in item 6 in order of increasing covalent character. Use orbital notation to illustrate the bonding in each of the following molecules: a. chlorine, Cl_(2) b. oxygen, O_(2) C. hydrogen fluoride, HF 9. The lattice energy of sodium chloride, NaCl, is -787.5kJ/mol. The lattice energy of potassium chloride, KCl, is -715kJ/mol. In which compound is Chapter 6 muleterler Gompounds REVIEWING MAIN IDEAS 10. What is a molecule? 11. a. What determines bond length? b. In general, how are bond energies and bond lengths related? 12. Describe the general location of the electrons in covalent bond. 13. As applied to covalent bonding, what is meant by a unshared or lone pair of electrons? 14. Describe the octet rule in terms of noble-gas contip rations and potential energy. 15. Determine the number of valence electrons in as atom of each of the following elements: a. H b. F C. Mg d. O e. Al f. N B. C 16. In a Lewis structure, which atom is usually the central atom? 17. Distinguish between single double, and triple covalent bonds by defining each and providing is illustration of each type. 18. For Lewis structures, how is the need for multiple bonds generally determined? __ PRACTICE PROBLEMS 19. Use Lewis valence electron dot structures to expres the arrangement of valence electrons present in cot atom of each of the following elements. (Hint: Set Sample Problem B.) a. Li e. C b. Ca f. p C. Cl g. Al d. 0 h.S
- 3) Soient 3 isotopes de l'élément X, tel que : 15% de {}^20X 25% de {}^24X et le reste pour {}^26X Calculez la masse atomique moyenne de X.
- Defne yukandak saylards. cip biri en yakun olusturablens sini seçip biri pay digeri kilde 2ye en yakn Olusturation Saylan. olusturuyor. Buna gore Defne sayilarin carpim kaçtir? A) 20 B) 30 Yukandaki sekilde vị Ayni kurala gord ralamasi asag A) vert gt Vert gt Vert vert Hop!
- (b) The atomic radius of lithium is (23 A^circ. when the outermost 25 electrons is ionised off. The ionic radii of Lit is 0.76 A^circ . Assuming that the difference in radii relate to the space occupied by the 25 electrons, calculate the percentage of the volume of the lithium atom that is occupied by the valence electron. (c) The density of the anhydrous aluminium chloride was measured at 200^circ mathrm(C), 600^circ mathrm(C) and 800^circ mathrm(C) at atmospheric pressure and results are given below. Temperature in ( )^circ mathrm(C) & 200 & 600 & 800 Density in mathrm(g) / mathrm(cm)^3 & 6.9 & 2.7 & 1.5 i. Calculate the relative molecular mass of anhydrous aluminium chloride vapour at each temperature. [ R=8.31 mathrm(~J) / mathrm(K) (. ) ] ii. What is the probable molecular formula of aluminium chloride vapour at 200^circ mathrm(C) and 800^circ mathrm(C) . (mathrm(AL)=27.0, mathrm(CL)=35) iii. Outline the laboratory preparation of anhydrous Aluminium chloride from aluminium (d) Explain why the conductivity of the Lit (ion) is atomically to water. Question two a) Describe in details the extraction process of Aluminium from its principal or outlining the role of each chemical used.
- i. Calculate the relative molecular mass of anhydrous aluminium chloride vapour at each temperature. R=8.31J/K. ii. What is the probable molecular formula of aluminium chloride vapour at 200^circ c and