June 2016 Chemistry Regents #66-69

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 Questions 52-53 Questions 54-55 Questions 56-58 Questions 59-60 Questions 61-62 Questions 63-65 Questions 66-69  Questions 70-71  Questions 72-74  Questions 75-77  Questions 78-81  Questions 82-85

 

Other Regents Exams

Question 66-69

 

 

Base your answers to questions 66 through 69 on the information below and on your knowledge of chemistry.

Potassium phosphate, K3PO4, is a source of dietary potassium found in a popular cereal. According to the Nutrition-Facts label shown on the boxes of this brand of cereal, the accepted value for a one-cup serving of this cereal is 170. milligrams of potassium. The minimum daily requirement of potassium is 3500 milligrams for an adult human.

66 Identify two types of chemical bonding in the source of dietary potassium in this cereal. [1]

Answer--> Ionic and covalent

67 Identify the noble gas whose atoms have the same electron configuration as a potassium ion. [l]

Answer--> Argon or Ar

68 Compare the radius of a potassium ion to the radius of a potassium atom. [I]

Answer-->  the potassium ion is smaller than the atom.

69 The mass of potassium in a one-cup serving of this cereal is determined to be 172 mg. Show a numerical setup for calculating the percent error for the mass of potassium in this serving. [1]

Answer-->   (172-170)/170 *100%

on to Questions 70-72

 

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 Questions 52-53 Questions 54-55 Questions 56-58 Questions 59-60 Questions 61-62 Questions 63-65 Questions 66-69  Questions 70-71  Questions 72-74  Questions 75-77  Questions 78-81  Questions 82-85

 

Back to Regents Exams