January 2010 Chemistry Regents #11-20

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51-52 Questions 53-55 Questions 56-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-75 Questions 76-78 Questions 79-81  Questions 82-84

 

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Questions

Answer Link Explanations
11 Which formula represents a nonpolar molecule?
(1) HCl     (3) NH3
(2) H2O    (4) CH4
4 Link draw them, the symmetrical one is nonpolar
12 Which symbol represents an atom in the ground state with the most stable valence electron configuration?
(1) B     (3) Li
(2) O     (4) Ne
4 Link Group 18 is stable
13 Which element has an atom with the greatest tendency to attract electrons in a chemical bond?
(1) carbon     (3) silicon
(2) chlorine    (4) sulfur
2 Link Definition of Electronegativity, Table S
14 The nitrogen atoms in a molecule of N2 share a total of
(1) one pair of electrons
(2) one pair of protons
(3) three pairs of electrons
(4) three pairs of protons
3 Link Nitrogen triple bonds
15 An ionic compound is formed when there is a reaction between the elements
(1) strontium and chlorine
(2) hydrogen and chlorine
(3) nitrogen and oxygen
(4) sulfur and oxygen
1 Link metal and nonmetal
16 Which compound has both ionic and covalent bonding?
(1) CaCO3 (3) CH3OH
(2) CH2Cl2 (4) C6H12O6
1 Link Look for 3 elements and 1 must be a metal
17 The liquids hexane and water are placed in a test tube. The test tube is stoppered, shaken, and placed in a test tube rack. The liquids separate
into two distinct layers because hexane and water have different
(1) formula masses
(2) molecular polarities
(3) pH values
(4) specific heats
2 Link like dissolves like, water is polar and hexane is not
18 Which statement describes the particles of an ideal gas based on the kinetic molecular theory?
(1) The gas particles are relatively far apart and have negligible volume.
(2) The gas particles are in constant, nonlinear motion.
(3) The gas particles have attractive forces between them.
(4) The gas particles have collisions without transferring energy.
1 Link straight line motion, no attractions allowed
19 Under which conditions of temperature and pressure would a 1-liter sample of a real gas behave most like an ideal gas?
(1) 100 K and 0.1 atm
(2) 100 K and 10 atm
(3) 500 K and 0.1 atm
(4) 500 K and 10 atm
3 Link ideal gas= ideal vacation

high temps and low pressures

20 Which type of energy is associated with the random motion of the particles in a sample of gas?
(1) chemical energy
(2) electromagnetic energy
(3) nuclear energy
(4) thermal energy
4 Link motion is kinetic, average kinetic is temperature, temperature is thermal

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51-52 Questions 53-55 Questions 56-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-75 Questions 76-78 Questions 79-81  Questions 82-84

 
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