12 December 2017 Student II /No Name lose valence electrons to form positively c
ID: 697539 • Letter: 1
Question
12 December 2017 Student II /No Name lose valence electrons to form positively charged B. metals, cations E. nonmetals, cations 21. In the formation of ions, C. metals, polyatomic ions A. metals, anions nonmetals, anions 22. Which of the following correctly describes the process of exhalation (forcing air out of the lungs)? A. The lungs expand, causing their internal pressure to decrease. B. The lungs expand, causing their internal pressure to increase. C. The lungs contract, causing their internal pressure to decrease. D. The lungs contract, causing their internal pressure to increase. E. There is no change in the internal pressure in the lungs. B. a nonpolar molecule with polar bonds. D. a polar molecule with nonpolar bonds. 23. The ammonia molecule (NH) is A. a polar molecule with polar bonds C. a nonpolar molecule with nonpolar bonds. E. a polar molecule with ionic bonds. protein. If a cup of kidney beans contains 15 g of protein, 1.5 g of fat, and 42 g of carbohydrate, how many kilocalories, to two significant figures, does this sample contain? A. 60. Keal B.88 kcal 24. In a food sample the caloric values are defined as: 4 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for D. 230 kcal E. 520 kcal C. 240 kcal 25. The ability of an atom to attract the shared electrons in a covalent bond is its D. ionic character. B. electronegativity. C. polarity A. bonding ability. E. nonpolarity. 26. The shape of the water molecule (H,O) is A. linear B. tetrahedral. C. trigonal pyramidal D. bent E. octagonal. going down a group and B. decreases, increases. E. none of the above 27. The atomic size of atoms going across the period. C. decreases, decreases. A. increases, decreases. D. increases, increases. 28 Gallium is an element found in lasers used in compact disc players. In a sample of gallium there is 60.10% of "Ga (atomic mass 68.93) atoms and 39.90% of T'Ga (atomic mass 70.92) atoms. What is the atomic mass of gallium? A. 60.20 B. 70. C. 50. D. 69.72 E. 69.93 29, The is the minimum energy to begin A. reaction energy D. energy of products B. activation ener C. energy of reactants eaction 30. The electron arrangement of any particular atom shows A. the number of isotopes possible. B. a description of the shape of each electron energy level C. the number of electrons in each energy level. D. a diagram of an atomic nucleus. E the maximum number of electrons each energy level can holdExplanation / Answer
21.
(b) Metals, cations
22.
(D)
23.
(A) a polar molecule with polar bonds
24.
15(4) + 1.5(9) + 42(4) = 241.5 kcal
(C)
25.
(B) Electronegativity
26.
(D) Bent
27.
(A)
28.
Atomic mass = 68.93(0.6010) + 70.92(0.3990) = 69.72 amu
(D)
29.
Activation energy
30.
(C)
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