Question

set b: test on properties of ionic & covalent compounds, imfs, molecular geometry
part a: multiple choice. circle the best answer and explain the letter you chose. (4 points each). one point for each correct choice and 3 points for the explanation.

1. which of the following is not a property of ionic compounds?

a) high melting point
b) conduct electricity in molten form
c) low boiling point
d) form crystalline solids
explain:_____________________________

1. covalent bonds are characterized by:

a) transfer of electrons
b) sharing of electrons
c) metallic bonding
d) free - moving electrons
explain:_____________________________

1. which molecule is covalent?

a) kbr
b) h₂o
c) naf
d) mgo

Explanation:

1. For question 1: Ionic compounds have strong electrostatic attractions between ions, leading to high melting/boiling points, conductivity when molten, and crystalline structures. A low boiling point is not their property.
2. For question 2: Covalent bonds form when atoms share valence electrons to achieve stable electron configurations, unlike ionic bonds (electron transfer) or metallic bonds (free-moving electrons).
3. For question 3: Covalent compounds form between nonmetals, while ionic compounds form between metals and nonmetals. H₂O consists of two nonmetals (hydrogen and oxygen), so it is covalent.

Answer:

1. C) Low boiling point
2. B) Sharing of electrons
3. B) H₂O