23 Sep 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?
Question 8Which of the following is the correct structural formula for a molecule of CH2S?
Question 9Predict the electron geometry and molecular geometry for each of the following molecules:
a. NF3 electron geometry: tetrahedral
b. H2S electron geometry:
c. SiH4electron geometry:
d. HCN electron geometry:
molecular geometry: linear
Question 10CH3F has a polar bond (between the C-F), is it also a polar molecule?
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