2004 August Chemistry Regents Exam #31-40

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

 

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Questions Answer Explanations

31 Which radioisotope undergoes beta decay and  has a half-life of less than 1 minute?

(1) Fr-220     (3) N-16

(2) K-42        (4) P-32

3 nuclear section- Use table N to determine the decay 

mode

32 Which set of symbols represents atoms with valence electrons in the same electron shell?

(1) Ba, Br, Bi           (3) O, S, Te

(2) Sr, Sn, I             (4) Mn, Hg, Cu

2 All the elements are in the same period

33 When compared with the energy of an electron in the first shell of a carbon atom, the energy of an electron in the second shell of a carbon atom is

(1) less

(2) greater

(3) the same

2 more energy in the higher energy levels

34 What is the total number of electrons found in an atom of sulfur?

(1) 6    (2) 8       (3) 16        (4) 32

3 2-8-6   atoms are neutral (from Switzerland)

35 Which electron configuration represents the electrons of an atom in an excited state?

(1) 2–8–1           (3) 2–8–17–6

(2) 2–8–6           (4) 2–8–18–5

3 Count the electrons and check that element for the same configuration

note an electron has been promoted in #3

36 The nucleus of an atom of cobalt-58 contains

(1) 27 protons and 31 neutrons

(2) 27 protons and 32 neutrons

(3) 59 protons and 60 neutrons

(4) 60 protons and 60 neutrons

1 cobalt has an atomic number of 27=protons

58 - 27- 31 neutrons

37 Which pair of formulas correctly represents a molecular formula and its corresponding empirical formula?

(1) C2H2 and CH           (3) C4H6 and CH

(2) C3H4 and CH2             (4) C5H8 and C2H2

1 empirical formulas are the lowest ratio of atoms in a formula

38 Which substance is correctly paired with its type of bonding?

(1) NaBr—nonpolar covalent

(2) HCl—nonpolar covalent

(3) NH3—polar covalent

(4) Br2—polar covalent

3 bonding- look at the electronegativity differences 

between the elements

39 A gas occupies a volume of 444 mL at 273 K and 79.0 kPa. What is the final kelvin temperature when the volume of the gas is changed to 1880 mL and the pressure is changed to 38.7 kPa?

(1) 31.5 K         (3) 566 K

(2) 292 K          (4) 2360 K

3 PV/T = PV/T

 

40 At STP, which of these substances is most soluble in H2O?

(1) CCl4         (3) HCl

(2) CO2          (4) N2

 

3 The polar substance dissolves in water

like dissolves like water is polar and so is HCl

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

 
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