June 2009 Chemistry Regents #1-10

Highlight to reveal answers and explanations

Back to Regents Exams

 

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

Questions 51-53 Questions 54-57 Questions 58-59 Questions 60-62 Questions 63-65 Questions 66-67 Questions 68-70 Questions 71-73 Questions 74-76 Questions 77-78 Questions 79-83

 

Questions

Answer Explanations
1 Which subatomic particle is negatively charged?
(1) electron      (3) positron
(2) neutron       (4) proton
1 electrons are negative
2 Which element has the greatest density at STP?
(1) barium        (3) magnesium
(2) beryllium    (4) radium
4 use TABLE S
3 What is the mass number of a carbon atom that contains six protons, eight neutrons, and six electrons?
(1) 6             (3) 14
(2) 8             (4) 20
3 Mass Number= protons + neutrons
4 Which element is a metalloid?
(1) Al       (3) As
(2) Ar       (4) Au
3 on the staircase, not Al or the radioactive Po or At
5 Which substance can be decomposed by chemical means?
(1) aluminum      (3) silicon
(2) octane          (4) xenon
2 DEFINITION-compounds
6 An element that is malleable and a good conductor of heat and electricity could have an atomic number of
(1) 16     (3) 29
(2) 18     (4) 35
3 Metal properties
7 A 1.0-mole sample of krypton gas has a mass of
(1) 19 g    (3) 39 g
(2) 36 g    (4) 84 g
4 Atomic Mass= mass of 1 mole of an element
8 An atom in the ground state has a stable valence electron configuration. This atom could be an atom of
(1)Al     (3) Na
(2) Cl    (4) Ne
4 Stable is 8 valance electrons, Group 18
9 An atom of an element has a total of 12 electrons. An ion of the same element has a total of 10 electrons. Which statement describes the charge and radius of the ion?
(1) The ion is positively charged and its radius is smaller than the radius of the atom.
(2) The ion is positively charged and its radius is larger than the radius of the atom.
(3) The ion is negatively charged and its radius is smaller than the radius of the atom.
(4) The ion is negatively charged and its radius is larger than the radius of the atom.
1 First the atom is Mg

the ion is 2+

and it loses 2 electrons and get smaller

10 Which formula represents a nonpolar molecule?
(1) CH4    (3) H2O
(2) HCl     (4) NH3
1 draw them and the symmetrical one is nonpolar

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

Questions 51-53 Questions 54-57 Questions 58-59 Questions 60-62 Questions 63-65 Questions 66-67 Questions 68-70 Questions 71-73 Questions 74-76 Questions 77-78 Questions 79-83

 
Back to Regents Exams
 

web stats analysis