June 2009 Chemistry Regents #21-30

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Questions

AnswerExplanations
21 Changes in activation energy during a chemical reaction are represented by a
(1) cooling curve
(2) heating curve
(3) ionization energy diagram
(4) potential energy diagram		4PE diagram is the bump curve
22 Under which conditions of temperature and pressure would a real gas behave most like an ideal gas?
(1) 200. K and 50.0 kPa
(2) 200. K and 200.0 kPa
(3) 600. K and 50.0 kPa
(4) 600. K and 200.0 kPa		3Ideal Gas=> ideal vacation

low pressure and high temperatures

2Equilibrium

Concentrations constant and the rates are equal

24 Which compound is a saturated hydrocarbon?
(1) propanal      (3) propene
(2) propane      (4) propyne		2saturated are alkanes
25 The isomers butane and methylpropane differ in their
(1) molecular formulas
(2) structural formulas
(3) total number of atoms per molecule
(4) total number of bonds per molecule		2both have 4 carbons but there structures are different
26 Which word equation represents a neutralization reaction?
(1) base + acid => salt + water
(2) base +salt => water + acid
(3) salt + acid =>base + water
(4) salt + water=> acid + base		1base + acid => salt + water
27 An aqueous solution of lithium hydroxide contains hydroxide ions as the only negative ion in the solution. Lithium hydroxide is classified as an
(1) aldehyde      (3) Arrhenius acid
(2) alcohol         (4) Arrhenius base		4definition of Arrhenius Base
28 One alternate acid-base theory states that an acid is an
(1) H+ donor       (3) OH- donor
(2) H+ acceptor   (4) OH- acceptor		1H+ donor is and acid

H+ acceptor is and base

 

29 Which particle has the greatest mass?
(1) an alpha particle (3) a neutron
(2) a beta particle (4) a positron		1alpha than beta,  gamma no mass

positron same mass as beta

30 A beta particle may be spontaneously emitted from
(1) a ground-state electron
(2) a stable nucleus
(3) an excited electron
(4) an unstable nucleus		4radioactive=> unstable nucleus

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

 
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