June 2015 Chemistry Regents #80-82

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

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

 

Other Regents Exams

Question 80-82

 

 

Base your answers to questions 80 through 82 on the information below and on your knowledge of chemistry.

A scientist bubbled HCl(g) through a sample of H2O(l). This process is represented by the balanced equation below.

HCl(g) + H2O(l) --> H3O+(aq) +Cl-(aq)

The scientist measured the pH of the liquid in the flask before and after teh gas was bubbled through the water. The initial pH value of the water was 7.0 and the final pH value of the solution was 3.0

80 Explain, in terms of ions, why the gaseous reactant in the equation is classified as an Arrhenius acid. [1]

Answer--> It produces H+ in water.

81  What would be the color of bromocresol green if it had been added to the water in the flask before any of the HCl(g) was bubbled through the water. [1]

Answer--> Blue

82 Compare the hydronium ion concentration of the solution that has a pH value of 3.0 to the hydronium ion concentration of the water. [1]

Answer--> The acid has a larger hydronium concentration than the water.

(10,000x times larger, but they didn't ask this)

on to Questions 83-85

 

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
 

Back to Regents Exams

 

web stats analysis