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Skills Practice Answers

Skills Practice Answers. Skills Practice 1. 9,434,880 mL 17.8 cases 0.333 pallet a) 0.1560 m b) 4.1x10 10 c) 92,000 μ m d) 91,600 nm a) 2.229x10 7 b) 8.07x10 6 c) 5.41x10 20 d) 1.12x10 7 a) 2.300021x10 10 b) 3.51x10 -9 a) 235,400 b) 0.000000003400. Skills Practice 2. 325.2

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Skills Practice Answers

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  1. Skills Practice Answers

  2. Skills Practice 1 • 9,434,880 mL • 17.8 cases • 0.333 pallet • a) 0.1560 m b) 4.1x1010 c) 92,000 μm d) 91,600 nm • a) 2.229x107 b) 8.07x106 c) 5.41x1020 d) 1.12x107 • a) 2.300021x1010 b) 3.51x10-9 • a) 235,400 b) 0.000000003400

  3. Skills Practice 2 • 325.2 • 18,000 • 0.0175 • 0.790 • 28,910,000 • 27 • 4.9x1012 • 1.86x105

  4. Skills Practice 8 • a) 21 b) Scandium (Sc) c) 22 • Atoms of the same element (having the same number of protons) with a different number of neutrons. • a) -2 b) sulfur c) 17 • 1;3 • +2 • 30 • B) ions • Strontium (Sr)

  5. Skills Practice 9 • a) 74.92 amu b) Arsenic (As) • a) 51.99 amu b) Chromium (Cr) • The most abundant is the one with a mass of 40.00 amu. • 41.996 amu

  6. Skills Practice 10 • Ground state: the normal energy level that an electron occupies. Excited state: when an electron has absorbed energy to occupy a higher energy level. • 7.11x10-8 m • 8.62x10-20 J • 3.68x10-19 J • a) 8.52x1014 Hz b) 5.65x10-19 J • f=7.68x1014 Hz wavelength= 3.91x10-7 m

  7. Skills Practice 11 • There is no such thing as an f sublevel in the third energy level. Also, an f sublevel if it existed would have seven orbitals instead of four. • 8 • 10 • 2 • Orbitals = 9 Electrons =18 • 50 • 4p

  8. Skills Practice 13 • a. ends in: 3d b. ends in: 4d c. ends in: 4p 2) a. 1s22s22p63s23p64s23d4 b. 1s22s22p63s23p64s23d104p65s24d105p3 c. 1s22s22p63s23p64s2 3) Because of Hund’s Rule the 2p sublevel should look like: 1s 2s 2p 4) Three

  9. Skills Practice 14 • a. 5 b. 2 c. 6 d. 8 e. 7 • a. 2-8-3 b. 2-6 c. 2-8-6 • Column 14 or IVA • a. 5 dots b. 2 dots c. 4 dots d. 7 dots

  10. Skills Practice 15 • Abbreviated electron configurations: • [Ar] 4s23d104p2 • [Xe] 6s2 • [Ar] 4s23d104p5 • [Xe]6s24f145d106p3 • [Ar] 4s23d5 • [Xe]6s24f145d9 • Column 6 (or VIB) • 5th row • 3rd row • Each d sublevel can hold 10 electons • Each p sublevel can hold 6 electrons

  11. Skills Practice 16 • The second energy level feels a +13 charge and the outer energy level feels a +5 charge. • Sulfur’s outer level of electrons feels a +6 charge pulling on it from the nucleus. Silicon’s outer level feels a weaker charge of +4 and therefore it is not pulled as close to the nucleus as sulfur’s outer level. • Chlorine is lower in the periodic table which would indicate that it is larger than lithium, but it is also located further to the right which would indicate that it is smaller. • a) S, Al, Mg, Na b) C, Si, Sn, Pb c) Br, Se, Ca, K d) C, B, Be, Mg, Ca e) Cl, P, Al, Ga f) Ne, O, S, Se

  12. Skills Practice 17 1. It is relatively hard to remove the first electon. 2. a) Ca, As, Se, Br b) Bi, As, P, N c) Ga, Al, Si, S d) K, Li, C, O e) Po, Te, S, O e) In, Sn, Te, I 3. Beryllium; After its two outermost electrons are removed, the next electron would need to be removed from an inner energy level, which is much more difficult. 4. Larger atoms tend to have smaller first ionization energies because the outer electrons are farther from the nucleus. Since the electrons are farther, the force of attraction from the nucleus is less.

  13. Skills Practice 18 • Fluorine atom: 2-7; Fluorine ion: 2-8 • 0; all atoms have a neutral charge. • +2 • -2, -1, -1, +2, +1, +2, +3, -3, -2, -1, +2, +1

  14. Skills Practice 19 • Ion Symbol • P-3 • Mg+2 • Rb+1 • F-1 • Al+3 • S-2 • Rewrite • BaS • Rb3N • LiCl • AlN • MgBr2 • Al2O3 • Formulas • Na2S • AlCl3 • Ca3P2 • BaO • Names • Sodium sulfide • Aluminum chloride • Calcium phosphide • Barium oxide • +1, +2, +3, +/-4, -3, -2, -1

  15. Skills Practice 20 • LiC2H3O2 • Na3PO4 • Mg(OH)2 • Omit • (NH4)2S • K2O • AlPO4 • NaOH • Omit • Omit • Calcium oxide • Barium chloride • Potassium phosphate • Magnesium hydroxide • Omit • Sodium acetate • Lithium sulfate • Ammonium sulfate • Aluminum cyanide • Beryllium chlorate

  16. Skills Practice 21 • MnF4 • (NH4)3PO4 • Ni(NO3)2 • Na3N • Al2(SO4)3 • Cr(OH)3 • Fe3(PO4)2 • CuCl2 • Copper(II) oxide • Iron(II) sulfate • Ammonium sulfide • Nickel(II) Phosphate • Chromium(III) hydroxide • Barium chlorate • Manganese(IV) nitride • Copper(I) carbonate • 6 • 3 • 4 • 8

  17. Skills Practice 22 • Dinitrogenpentoxide • Triphosphorusheptoxide • Trisulfurtetrafluoride • Carbon dioxide • Dinitrogenhexoxide • Copper(II) sulfate • Ammonium carbonate • Sulfur hexafluoride • H2O4 • N3S5 • CO2 • N20 • Fe(NO3)2 • CCl4 • C3H7 • H3PO4 • NO2 • CH2 • C6H9O • N2H3O2 • S2O7 • C4H3O4

  18. Skills Practice 28

  19. Skills Practice 29

  20. Skills Practice 30 • 7.02 x 1024molecules • 1121 grams • Quantity of particles needed to equal an element’s atomic mass in grams. • 1180 grams • 183.4 amu; 183.4 g/mol • 3.32 moles • 1.22 x 1024 atoms • 78.6 g/mol • 4655 grams • 1.81 x 1024 molecules

  21. Skills Practice 31 • 15.4% • a- 25.8% b- 64.7% • a- 53.8% b- 34.4% • N2O5 • N3O6 • a- C3H4O b- C24H32O8 • C18H27O36

  22. Skills Practice 32 • 35.0 g • 345 g LiNO3; 100 g Ca • 117 g Na3P; 239 CaSO4 • 181.7 g Al(NO3)3; 142 g CaCl2 • 41.8 g of each product

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