27. d. London dispersion 28. The empirical formula = CH2 empirical formula mass
ID: 700491 • Letter: 2
Question
27. d. London dispersion
28. The empirical formula = CH2
empirical formula mass = 14
molecular formula = (empirical forula)n
n = molecular mass/ empirical mass
= 56/14 = 4
molecular formula = (Ch2)4 = C4H8
c. C4H8
29. b. Ca^2+
30. 53 I^127
atomic mass of I = 53
atomic mass of I = 127
a. 53,53,74
31.HCN is linear shape
a. linear
32. CH4 is tetrahydral shape. It is nonpolar molecule
b. CH4
33. Cl = 17 1s^2 2S^2 2p^6 3s^2 3p^5
d.7
34. mass percentage of oxygen = 3*16*100/84 = 57.14%
35.a. NH4Cl
36.b. directly proportional to each other
37. P1V1 = P2V2
V2 = P1V1/P2
= 5*1/10 = 1/2L
b. 1/2L
38. H2PO4^- (aq) + H2O(aq) ---------------> H3Po4(aq) + OH^- (aq)
base acid conjugate acid conjugate base
b. H2O is an acid and OH^- is its conjugate base
Explanation / Answer
25. A compound contains 50% sulfur and 50% mass. 26. Which of the following should have the lowest bolling po 27. Identify the major intermolecular force between CO molecules oxygen by mass. What is the empirical formula of the d. SO compound? a. So a. CH a. Hydrogen bonding b. SO C. Dipole-dipole b. Ionic d. London dispersion 28. A compound has an empirical formula of CH2 and a molar mass of 56. What is its molecular formula? b. CHa 29. Which element or ion below has the electron configuration 1s'2s'2p 3s3p? a. Br b. Ca c. S d. Ne 30. How many protons, electrons, and neutrons, respectively, does 1"1 have? b. 53, 127,74 d. 74, 53, 127 a. 53, 53, 74 53, 74, 53 31. Which of the following is the correct geometry for HCN? 32. Which structural formula represents a nonpolar molecule? 33. The number of electrons in the outermost energy level of chlorine is: a. linear b. bent c. pyramidal d. tetrahedral a. HO b. CHa C. HF d. NHs a. 4 b. 5 C. 34. What is the percent by mass of oxygen in NaHCO, a. 12.05% b. 27.40% c. 44.20% d. 57.14% 35. Which one of the following substances is a strong electrolyte when dissolves in water? b. HC2H02 a. NH C 36. If temperature and pressure are held constant, the volume and number of moles of a gas are c. NHs independent of each other a. b. directly proportional to each other inversely proportional to each other c. d. equal 37. A gas is initially at a pressure of S atm. and occupies a volume of 1 liter. If the pressure is doubl to 10 atm., what will be the final volume? a. 2 L b. 1/2L C. d. 5L 38. In the following reaction: MPO,' (aq) + H2O (aq) Hpo, (aq) + OH-(aq) a. H2PO,-is an acid and H,Po, is its conjugate base. b. H,O is an acid and OH- is its conjugate base. c. HaPO,+ is an acid and OH is its conjugate base. d. H,O is an acid and H,PO, is its conjugate base.
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