June 2011 Chemistry Regents #71-73

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Questions

Base your answers to questions 71 through 73  on the information below. In 1864, the Solvay process was developed to make soda ash. One step in the process is represented by the balanced equation below. NaCl + NH3 + CO2 + H2O → NaHCO3 + NH4Cl 71. Write the chemical formula for one compound in the equation that contains both ionic bonds and covalent bonds. [1] HIGHLIGHT TO SEE THE ANSWER either NaHCO3 ro NH4Cl not both 72. Explain, in terms of electronegativity difference, why the bond between hydrogen and oxygen in a water molecule is more polar than the bond between hydrogen and  nitrogen in an ammonia molecule. [1] HIGHLIGHT TO SEE THE ANSWER there is a larger electronegativity difference between H and O (1.4) than there is between H and N (0.9) 73. In the space in your answer booklet, draw a Lewis electron-dot diagram for the reactant containing nitrogen in the equation. [1] Link  TO SEE THE ANSWER   on to Questions 74-76

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