Why is it incorrect to speak of a molecule of solid NaCl?
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Chemistry 2e · 7.2 Covalent Bonding
Covalent Bonding: practice problems
6 problems from the book, with its answers. Check your working, or have any of them explained to you on the whiteboard.
Exercises 13
Predict which of the following compounds are ionic and which are covalent, based on the location of their constituent atoms in the periodic table:
(a) Cl₂CO
(b) MnO
(c) NCl₃
(d) CoBr₂
(e) K₂S
(f) CO
(g) CaF₂
(h) HI
(i) CaO
(j) IBr
(k) CO₂
Exercises 15
From its position in the periodic table, determine which atom in each pair is more electronegative:
(a) Br or Cl
(b) N or O
(c) S or O
(d) P or S
(e) Si or N
(f) Ba or P
(g) N or K
Exercises 17
From their positions in the periodic table, arrange the atoms in each of the following series in order of increasing electronegativity:
(a) C, F, H, N, O
(b) Br, Cl, F, H, I
(c) F, H, O, P, S
(d) Al, H, Na, O, P
(e) Ba, H, N, O, As
Exercises 19
Which atoms can bond to sulfur so as to produce a positive partial charge on the sulfur atom?
Exercises 21
Identify the more polar bond in each of the following pairs of bonds:
(a) HF or HCl
(b) NO or CO
(c) SH or OH
(d) PCl or SCl
(e) CH or NH
(f) SO or PO
(g) CN or NN
Key terms · 5
- bond length
- distance between the nuclei of two bonded atoms at which the lowest potential energy is achieved
- covalent bond
- bond formed when electrons are shared between atoms
- electronegativity
- tendency of an atom to attract electrons in a bond to itself
- polar covalent bond
- covalent bond between atoms of different electronegativities; a covalent bond with a positive end and a negative end
- pure covalent bond
- (also, nonpolar covalent bond) covalent bond between atoms of identical electronegativities
Learn 7.2 on the whiteboard
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