Question

question 16 of 20
the properties of several unknown solids were measured.
solid melting point other properties
a >1000 °c does not conduct electricity
b 850 °c conducts electricity in the liquid state, but not in the solid state
c 750 °c conducts electricity in the solid state
d 150 °c does not conduct electricity
classify the solids as ionic, molecular, metallic, or covalent. note that covalent compounds are also known as covalent network solids or macromolecular solids.
ionic molecular metallic covalent
answer bank
a d b c

Explanation:

Step1: Analyze solid A

High melting - point and non - conducting. Covalent network solids have high melting points and do not conduct electricity. So solid A is covalent.

Step2: Analyze solid B

Melting point is moderate, conducts in liquid but not solid. Ionic solids conduct electricity in the liquid state (when ions are free to move) but not in the solid state. So solid B is ionic.

Step3: Analyze solid C

Conducts in solid state and has a moderate melting point. Metallic solids conduct electricity in the solid state due to delocalized electrons. So solid C is metallic.

Step4: Analyze solid D

Low melting point and non - conducting. Molecular solids have low melting points and do not conduct electricity as they are held together by weak intermolecular forces. So solid D is molecular.

Answer:

Ionic: B
Molecular: D
Metallic: C
Covalent: A