January 2015 Chemistry Regents #46-50

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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

Question 51-53 Questions 54-55
 Questions 56-58 Questions 59-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-81 Questions 82-85

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Questions

AnswerLinks

Explanations

46 What are the products when potassium hydroxide reacts with hydrochloric acid?

(1) KH(s), Cl-(aq), and OH-(aq)

 (2) K(s), Cl2(g), and H2O(ℓ)

 (3) KCl(aq) and H2O(ℓ)

 (4) KOH(aq) and Cl2(g)

3LinkHCl(aq) + KOH(aq) → HOH(ℓ) + KCl(aq)
47 In a titration, 20.0 milliliters of a 0.150 M NaOH(aq) solution exactly neutralizes 24.0 milliliters of an HCl(aq) solution. What is the concentration of the HCl(aq) solution?

(1) 0.125 M (3) 0.250 M

(2) 0.180 M (4) 0.360 M

1LinkMV=MV

M(24mL)=0.150M(20.0mL)

 

48 What fraction of a Sr-90 sample remains unchanged after 87.3 years?

4LinkTable N

87.1/29.1y= 3 half lives

1-->1/2-->1/4-->1/8

 

49 Which potential energy diagram represents the change in potential energy that occurs when a catalyst is added to a chemical reaction?2Linkthe hill becomes a bump. the PE of the reactants and products will not change
50 Which balanced equation represents a spontaneous radioactive decay?

4Linklook for 1 reactant and a new element formed

 

On to Question 51-53

 

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

Question 51-53 Questions 54-55
 Questions 56-58 Questions 59-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-81 Questions 82-85

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