June 2015  Chemistry Regents #26-30

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26 Given the equation representing a system at equilibrium:

N2(g) + 3H2(g) <==>  2NH3(g)

Which statement describes this reaction at equilibrium?

(1) The concentration of N2(g)  decreases.

(2) The concentration of N2(g)  is constant.

(3) The rate of the reverse reaction decreases.

(4) The rate of the reverse reaction increases.

 
2 Link Concentrations are constants a

or the rates are equal

 

con con requal

27  The acidity or alkalinity of an unknown aqueous solution is indicated by its

(1) pH value

(2) electronegativity value

(3) percent by mass concentration

(4) percent by volume concentration 

1 link pH is the answer

28.  The laboratory process in which the volume of a solution of known concentration is used to determine the concentration of another solution is called

(1) distillation     (2) fermentation

(3) titration         (4) transmutation

3 link definition of a titration

 

29 Which list of nuclear emissions is arranged in order from the greatest penetrating power to the least penetrating power?

(1) alpha particle, beta particle, gamma ray

(2) alpha particle, gamma ray, beta particle

(3) gamma ray, alpha particle, beta particle

(4) gamma ray, beta particle, alpha particle

4 link  gamma ray, beta particle, alpha particle

smallest (no mass) to biggest

30 Given the diagram representing a reaction:

Which type of change is represented?

(1) fission        (2) fusion

(3) deposition  (4) evaporation

1 link the atom is splitting...fission

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-53 Questions 54-56 Questions 57-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

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