January 2016 Chemistry Regents #57-61

Highlight to reveal answers and explanations

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 54-56
 Questions 57-61 Questions 62-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-82 Questions 83-85

Other Regents Exams

 

Base your answers to questions 56 through 58 on the information below and on your knowledge of chemistry. 

 


The Lewis electron-dot diagrams for three substances are shown below.

57 Describe, in terms of valence electrons, how the chemical bonds form in the substance represented in diagram 1. [1]

Answer==>K loses and electron and Br gains an electron. The difference in charge causes the attraction.

58 Determine the total number of electrons in the bonds between the nitrogen atom and the three hydrogen atoms represented in diagram 2. [1]

Answer==>  6

59 Explain, in terms of distribution of charge, why a molecule of the substance represented in diagram 3 is nonpolar. [1]

Answer==>The distribution of charge is symmetrical

60 Draw a Lewis electron-dot diagram for a molecule of Br2. [1]

Answer==>link to answer

61 Identify the noble gas that has atoms with the same electron configuration as the positive ion represented in diagram 1, when both the atoms and the ion are in the ground state. [1]

Answer==>Ar or argon

on to Questions 62-65

 

 
 

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 54-56
 Questions 57-61 Questions 62-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-82 Questions 83-85

 

Back to Regents Exams