January 2009 Chemistry Regents #11-20

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

Questions 51-53 Questions 54-55 Questions 56-58 Questions 59-61 Questions 62-64 Questions 65-66 Questions 67-68 Questions 69-71 Questions 72-74 Questions 75-77 Questions 78-79 Questions 80-81

 

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Questions

Answer Explanations
11 During all chemical reactions, mass, energy, and charge are
(1) absorbed     (3) formed
(2) conserved    (4) released
2 conserved (always on test)
12 Which formula represents a molecular compound?
(1) Kr         (3) N2O4
(2) LiOH    (4) NaI
3 molecular = covalent (2 nonmetals)
13 The bonds in BaO are best described as
(1) covalent, because valence electrons are shared
(2) covalent, because valence electrons are transferred
(3) ionic, because valence electrons are shared
(4) ionic, because valence electrons are transferred
4 ionic, transferred
14 In which sample of water do the molecules have the highest average kinetic energy?
(1) 20. mL at 100.C    (3) 60. mL at 60.C
(2) 40. mL at 80.C      (4) 80. mL at 40.C
1 highest temperature
15 Which compound is insoluble in water?
(1) calcium bromide (3) silver bromide
(2) potassium bromide (4) sodium bromide
3 TABLE F
16 Which element is a brittle solid with low conductivity at STP?
(1) sulfur       (3) argon
(2) sodium    (4) aluminum
1 nonmetal, not Argon it is a gas
17 Which two samples of gas at STP contain the same total number of molecules?
(1) 1 L of CO(g) and 0.5 L of N2(g)
(2) 2 L of CO(g) and 0.5 L of NH3(g)
(3) 1 L of H2(g) and 2 L of Cl2(g)
(4) 2 L of H2(g) and 2 L of Cl2(g)
4 the 2 gases with the same volume (Avogadro's Hypothesis)
18 A reaction is most likely to occur when reactant particles collide with
(1) proper energy, only
(2) proper orientation, only
(3) both proper energy and proper orientation
(4) neither proper energy nor proper orientation
3 both are need for a reaction to occur
19 The net energy released or absorbed during a reversible chemical reaction is equal to
(1) the activation energy of the endothermic reaction
(2) the activation energy of the exothermic reaction
(3) the difference between the potential energy of the products and the potential energy of the reactants
(4) the sum of the potential energy of the products and the potential energy of the reactants
3 heat of reaction or C
20 A catalyst lowers the activation energy of a reaction by
(1) providing an alternate reaction pathway
(2) decreasing the heat of reaction
(3) increasing the mass of the reactants
(4) changing the mole ratio of the reactants
1 definition of catalyst

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

Questions 51-53 Questions 54-55 Questions 56-58 Questions 59-61 Questions 62-64 Questions 65-66 Questions 67-68 Questions 69-71 Questions 72-74 Questions 75-77 Questions 78-79 Questions 80-81

 
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