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Predict whether each of the following is held together by ionic or covalent bonds:

CHEM1305 Introductory Chemistry

Chapter 12 Homework Assignment  

Question 1Predict whether each of the following is held together by ionic or covalent bonds:

 

a. water, H2O          covalent

 

b. calcium chloride, CaCl2          ionic

 

c. potassium oxide, K2O          ionic

 

d. carbon disulfide, CS2          covalent

 

Question 2State whether the following is true or false about the following ionic compounds:

 

a. in a sodium bromide formula unit, NaBr, the sodium atom has lost electrons and the bromine atom has gained electrons

 

c. in a calcium oxide formula unit, CaO, the calcium and oxygen from a bond by sharing electrons

 

d. calcium and oxide ions form a bond by an attraction between the ions

 

Question 3State whether the following is true or false about the following molecular compounds:

 

a. in a molecule of sulfur dioixide, SO2, the valence electrons are transferred from oxygen to sulfur

 

b. the S-O bond length equals the sum of the two atomic radii

 

c. in a molecule of hydrogen bromide, HBr, the valence electrons are shared by the hydrogen and bromine atoms

 

d. the H-Br bond length is less than the sum of the two atomic radii

 

Question 4Predict which element in each of the following pairs is more electronegative according to the general electronegativity trends in the periodic table:

 

a. C or O          O

 

b. Cl or Br          Cl

 

c. F or N          F

 

d. Si or P          P

 

Question 5Calculate the electronegativity difference between each of the following:

 

a. the bond between P and S          0.4

 

b. the bond between H and Br          0.7

 

Question 6Classify each of the following as either a polar covalent bond or nonpolar covalent bond:

 

a. F-F          nonpolar covalent bond

 

b. H-O          polar covalent bond

 

c. H-P          polar covalent bond

 

d. C-F          polar covalent bond

 

Question 7Which of the following is the correct electron dot formula for a molecule of HOCl?

 

a. HOCl_1.png

 

b. HOCl_2.png

 

c. HOCl_3.png

 

d. HOCl_4.png

 

Question 8Which of the following is the correct structural formula for a molecule of CH2S?

 

a. CH2S_1.png

 

b. CH2S_2.png

 

c. CH2S_3.png

 

d. CH2S_4.png

 

Question 9Predict the electron geometry and molecular geometry for each of the following molecules:

 

a. NF3 electron geometry: tetrahedral

 

molecular geometry:

 

b. H2S electron geometry:

 

molecular geometry:

 

c. SiH4electron geometry:

 

molecular geometry:

 

 d. HCN electron geometry:

 

molecular geometry: linear

 

Question 10CH3F has a polar bond (between the C-F), is it also a polar molecule?

 

  yes

 

  no

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