January 2007 Chemistry 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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AnswerExplanations
1 Which subatomic particles are located in the nucleus of a neon atom?
(1) electrons and positrons
(2) electrons and neutrons
(3) protons and neutrons
(4) protons and electrons
3nucleus= protons and neutrons
2 The total mass of the protons in an atom of gold-198 is approximately
(1) 79 atomic mass units
(2) 119 atomic mass units
(3) 198 atomic mass units
(4) 277 atomic mass units
1atomic number of gold is 79= #protons

each proton is 1 amu

 

3 In a calcium atom in the ground state, the electrons that possess the least amount of energy are located in the
(1) first electron shell
(2) second electron shell
(3) third electron shell
(4) fourth electron shell
1least energy lowest energy level, so 1
4 Which group of atomic models is listed in historical order from the earliest to the most recent?
(1) hard-sphere model, wave-mechanical model, electron-shell model
(2) hard-sphere model, electron-shell model, wave-mechanical model
(3) electron-shell model, wave-mechanical model, hard-sphere model
(4) electron-shell model, hard-sphere model, wave-mechanical model
2Dalton, Bohr, Wave Model
4that is it Table N
6 An atom of argon rarely bonds to an atom of another element because an argon atom has
(1) 8 valence electrons
(2) 2 electrons in the first shell
(3) 3 electron shells
(4) 22 neutrons
1filled valence shell of 8 e-
7 The elements on the Periodic Table are arranged in order of increasing
(1) boiling point        (3) atomic number
(2) electronegativity  (4) atomic mass
3atomic number, look at it
8 Which element is classified as a nonmetal?
(1) Be    (3) Si
(2) Al     (4) Cl
4right side of the staircase
9 Solid samples of the element phosphorus can be white, black, or red in color. The variations in color are due to different
(1) atomic masses
(2) molecular structures
(3) ionization energies
(4) nuclear charges
2different molecular structures have different properties
2balanced reaction are mole ratios

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

 
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