January 2011 Chemistry Regents #69-71

Highlight to reveal answers and explanations

 

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51-53 Questions 54-55 Questions 56-57 Questions 58-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-74 Questions 75-77 Questions 78-80 Questions 81-83

 

Other Regents Exams

Questions

Base your answers to questions 69 to 71 on the information below.

A tablet of one antacid contains citric acid, H3C6H5O7, and sodium hydrogen carbonate, NaHCO3. When the tablet dissolves in water, bubbles of CO2 are produced. This reaction is represented by the incomplete equation below.

H3C6H5O7(aq) + 3NaHCO3(aq)==> Na3C6H5O7(aq) + 3CO2(g) + 3 _______ (ℓ)

69 Complete the equation in your answer booklet by writing the formula of the missing product. [1]

HIGHLIGHT TO SEE THE ANSWER

H2O

70 State evidence that a chemical reaction occurred when the tablet was placed in the water. [1]

HIGHLIGHT TO SEE THE ANSWER

Bubbles of CO2 gas were produced.

The reactants and products are different chemicals.

Bonds were broken and bonds were formed.

71 Determine the total number of moles of sodium hydrogen carbonate that will completely react with 0.010 mole of citric acid. [1]

HIGHLIGHT TO SEE THE ANSWER

ANSWER==>0.030 mol

Set up a proportion

0.010mol/1H3C6H5O7 =x mol/3NaHCO3

Next Questions

 

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51-53 Questions 54-55 Questions 56-57 Questions 58-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-74 Questions 75-77 Questions 78-80 Questions 81-83

 
Back to Regents Exams