January 2006 Chemistry Regents #11-20

Highlight to reveal answers and explanations

 

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

 

Other Regents Exams

Questions

Answer Explanations
11 Compared to a calcium atom, the calcium ion Ca2+ has
(1) more protons     (3) more electrons
(2) fewer protons    (4) fewer electrons
4 2+ has lost 2 electrons
12 Which type of bond is found in sodium bromide?
(1) covalent     (3) ionic
(2) hydrogen    (4) metallic
3 ionic, metal and nonmetal
13 Which substance can not be decomposed by ordinary chemical means?
(1) methane    (3) ethanol
(2) mercury    (4) ammonia
2 definition of an element
14 A mixture of crystals of salt and sugar is added to water and stirred until all solids have dissolved. Which statement best describes the resulting
mixture?
(1) The mixture is homogeneous and can be separated by filtration.
(2) The mixture is homogeneous and cannot be separated by filtration.
(3) The mixture is heterogeneous and can be separated by filtration.
(4) The mixture is heterogeneous and cannot be separated by filtration.
2 solutions are homogeneous mixtures and can not be separated by filtering
15 Under which conditions of temperature and pressure would a sample of H2(g) behave most like an ideal gas?
(1) 0C and 100 kPa
(2) 0C and 300 kPa
(3) 150C and 100 kPa
(4) 150C and 300 kPa
3 ideal gas=ideal vacation

high temp low pressures

16 In a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is defined as the
(1) activation energy
(2) ionization energy
(3) heat of reaction
(4) heat of vaporization
3 Hproducts-Hreactants=DH

DH=Heat of Reaction

Title of Table I

17 Which substance is an Arrhenius base?
(1) KCl (3) KOH
(2) CH3Cl (4) CH3OH
3 OH-, so KOH

  never organic (CH3OH) alcohol

18 Given the balanced equation:
I2(s) + energy ==> I2(g)
As a sample of I2(s) sublimes to I2(g), the entropy of the sample
(1) increases because the particles are less randomly arranged
(2) increases because the particles are more randomly arranged
(3) decreases because the particles are less randomly arranged
(4) decreases because the particles are more randomly arranged
2 solid lowest  entropy

gas highest entropy

19 The multiple covalent bond in a molecule of 1-butene is a
(1) double covalent bond that has 6 shared electrons
(2) double covalent bond that has 4 shared electrons
(3) triple covalent bond that has 6 shared electrons
(4) triple covalent bond that has 4 shared electrons
2 -ene = double bond, share 4 electrons between carbons
20 In an oxidation-reduction reaction, reduction is defined as the
(1) loss of protons     (3) loss of electrons
(2) gain of protons     (4) gain of electrons
4 LEO-lose electrons oxidation

GER-gain electrons reduction

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

 
Back to Regents Exams