August 2010 Chemistry Regents #21-30

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50 Questions 51-53 Questions 54-56 Questions 57-58 Questions 59-60 Questions 61-63 Questions 64-66 Questions 67-69 Questions 70-72 Questions 73-74 Questions 75-78 Questions 79-81

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Questions	Answer	Explanations
21 A gas sample is at 25°C and 1.0 atmosphere. Which changes in temperature and pressure will cause this sample to behave more like an ideal gas? (1) decreased temperature and increased pressure (2) decreased temperature and decreased pressure (3) increased temperature and increased pressure (4) increased temperature and decreased pressure	4	Ideal conditions are like ideal vacations high temperature and low pressure
22 The isotopes K-37 and K-42 have the same (1) decay mode (2) bright-line spectrum (3) mass number for their atoms (4) total number of neutrons in their atoms	2	the electrons are the same so the spectrums are the same isotopes only differ in the neutrons
23 Which element is present in all organic compounds? (1) carbon      (3) nitrogen (2) hydrogen  (4) oxygen	1	organic= carbon
	1	highest concentration reacts the most readily, more particles, more collisions
25 Which energy conversion occurs during the operation of an electrolytic cell? (1) chemical energy to electrical energy (2) electrical energy to chemical energy (3) nuclear energy to electrical energy (4) electrical energy to nuclear energy	2	electrolytic requires a battery, so electrical to chemical
26 Which compound is an Arrhenius acid? (1) CaO  (3) K2O (2) HCl   (4) NH3	2	starts with H
27 Based on the results of testing colorless solutions with indicators, which solution is most acidic? (1) a solution in which bromthymol blue is blue (2) a solution in which bromcresol green is blue (3) a solution in which phenolphthalein is pink (4) a solution in which methyl orange is red	4	Use table M acids have low pHs
28 According to one acid-base theory, water acts as an acid when an H2O molecule (1) accepts an H+ (3) accepts an H- (2) donates an H+ (4) donates an H-	2	acids donate H+ Bases accept them
29 In which type of reaction is an atom of one element converted to an atom of a different element? (1) decomposition  (3) saponification (2) neutralization    (4) transmutation	4	definition of transmutation
	2	Table N