Question

1) Determine all of the ionic compounds from the compounds listed below.
          I. CaH₂         II. H₂S         III. SiH₄

2)  A chemical formula of the carbide ion is
A. Si^4–
B. C₂^–
C. C₂^2–
D. CN^–
E. C₃^–

3)Which of these reactions is an example of nitrogen fixation?
A. 2N₂O 2N₂ + O₂
B. NH₃ + H₂O NH₄⁺ + OH^–
C. N₂ + O₂ 2NO
D. 2NO₂ + H₂O HNO₂ + HNO₃
E. 2NO + O₂ 2NO₂

₄₎When phosphate rock, Ca₃(PO₄)₂(s), is converted to phosphorus,
A. one of the products of the reaction is water.
B. sulfuric acid is added to generate insoluble calcium sulfate.
C. hydrogen is used to reduce the phosphate to phosphorus.
D. silica is added to form a calcium silicate slag.
E. oxygen must be added to prevent reaction of P₄.

5)

Which of the following choices is/are covalent oxides?
         I. SrO          II. SiO₂          III. SO₂
A. I only
B. II only
C. III only
D. I and II
E. II and III

6)The bond energy of F₂ is unusually low, in comparison with the other halogens, due to the small size of the fluorine atom. Which of the following periodic properties is also unusually low in the case of fluorine?
A. first ionization energy
B. electron affinity
C. electronegativity
D. diatomic bond length
E. ionic radius

7)Write the chemical formula of the oxide ion.
A. O^2–
B. O^–
C. O₂^–
D. O₂^2–
E. None of the above

8) Write the chemical formula of the oxide ion.
A. O^2–
B. O^–
C. O₂^–
D. O₂^2–
E. None of the above