June 2019 Chemistry Regents #21-25

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Questions 51 Questions 52-54 Questions 55-57 Questions 58-61 Questions 62-65 Questions 66-69 Questions 70-73 Questions 74-77 Questions 78-80 Questions 81-85  

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21 Which value is defined as the difference between the potential energy of the products and the potential energy of the reactants during a chemical reaction?

(1)  heat of fusion

(2) heat of reaction

(3) heat of deposition

(4) heat of vaporization

 

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22. The effect of a catalyst on a chemical reaction is to provide a new reaction pathway that results in a different

(1) potential energy of the products

(2) heat of reaction

(3) potential energy of the reactants

(4) activation energy

 

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23. Chemical systems in nature tend to undergo changes towards

(1)  lower energy and lower entropy

(2)  lower energy and higher entropy

(3)  higher energy and lower entropy

(4)  higher energy and higher entropy

 

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24. The atom of which element bond to one another in chains, rings, and networks?

(1) barium

(2) carbon

(3) iodine

(4) mercury

 

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25 What is the general formula from the homologous series that includes ethene?

(1)  CnH2n

(2)  CnH2n-2

(3)  CnH2n-6

(4)  CnH2n+2

 

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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

Questions 51 Questions 52-54 Questions 55-57 Questions 58-61 Questions 62-65 Questions 66-69 Questions 70-73 Questions 74-77 Questions 78-80 Questions 81-85  

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