January 2003 Regents #1-10

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

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Questions

Answer Explanations
1 Which statement best describes electrons?

(1) They are positive subatomic particles and are found in the nucleus.
(2) They are positive subatomic particles and are found surrounding
the nucleus.
(3) They are negative subatomic particles and are found in the
nucleus.
(4) They are negative subatomic particles and are found surrounding the nucleus.

  		4 Definiton of an electron
2 During a flame test, ions of a specific metal are heated in the flame of a
gas burner. A characteristic color of light is emitted by these ions in
the flame when the electrons

(1) gain energy as they return to lower energy levels
(2) gain energy as they move to higher energy levels
(3) emit energy as they return to lower energy levels
(4) emit energy as they move to higher energy levels

  		3 Definition of spectra production
3 In which list are the elements arranged in order of increasing atomic mass?

(1) Cl, K, Ar         (3) Te, I, Xe
(2) Fe, Co, Ni       (4) Ne, F, Na

  		1 Use PT
4 In which compound does chlorine have the highest oxidation number?

(1) NaClO         (3) NaClO3
(2) NaClO2        (4) NaClO4

  		4 Cl =-7 in NaClO4
5 Which event must always occur for a chemical reaction to take place?

(1) formation of a precipitate
(2) formation of a gas
(3) effective collisions between reacting particles
(4) addition of a catalyst to the reaction system

  		3 Effective collisions = a reaction
6 Which Group of the Periodic Table contains atoms with a stable outer
electron configuration?

(1) 1       (3) 16
(2) 8       (4) 18

  		4 Noble gases group 18
7 From which of these atoms in the ground state can a valence electron be
removed using the least amount of energy?

(1) nitrogen      (3) oxygen
(2) carbon        (4) chlorine

 		 2 Definition of Ionization Energy
8 What is the percent by mass of oxygen in H2SO4 ? [formula mass = 98]

(1) 16%     (3) 65%
(2) 33%     (4) 98%

 

3 (64/98) x 100%
9 An atom of carbon-12 and an atom of carbon-14 differ in

(1) atomic number
(2) mass number
(3) nuclear charge
(4) number of electrons

 		 2 Isotopes different # neutrons so different mass number
10 The strength of an atom’s attraction for the electrons in a chemical bond
is the atom’s

(1) electronegativity      (3) heat of reaction
(2) ionization energy     (4) heat of formation

  		1 Definition-electronegativity

 

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