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- 1. Multiple Choice
A sample of a hard, solid binary compound at room temperature did not conduct electricity as a pure solid but became highly conductive when dissolved in water. Which of the following types of interactions is most likely found between the particles in the substance?
Ionic bonds
Metallic bonds
Covalent bonds
Network Covalent
- 2. Multiple Choice
At room temperature I2(s) is a molecular solid. Which of the following provides a characteristic of I2(s) with a correct explanation?
It has a high melting point because it has weak intermolecular forces.
It is hard because it forms a threedimensional covalent network.
It is not a good conductor of electricity because valence electrons are immobilized and shared between the two atoms.
It is very soluble in water because its molecules are polar.
- 3. Multiple Choice
Which of the following could be the identity of a white crystalline solid that exhibits the following properties?
-It melts at 320°C.
-It does not conduct electricity as a solid.
-It conducts electricity in an aqueous solution.
C6H12O6(s)
NaOH(s)
SiO2(s)
Cu(s)
- 4. Multiple Choice
A certain crystalline substance that has a low melting point does not conduct electricity in solution or when melted. This substance is likely to be
a covalent network solid
a metallic solid
an ionic solid
a molecular solid
- 5. Multiple Choice
A student is given a sample of a pure, white crystalline substance. Which of the following would be most useful in providing data to determine if the substance is an ionic compound?
Examining the crystals of the substance under a microscope
Determining the density of the substance
Testing the electrical conductivity of the crystals
Testing the electrical conductivity of an aqueous solution of the substance
- 6. Multiple Choice
What type of solid would you expect to have an atomic structure as seen in this image?
Network Covalent
Molecular
Ionic
Metallic
- 7. Multiple Choice
Which of the following most likely describes the solid represented in the diagram above?
It is soft and is a poor thermal and electrical conductor.
It has a low melting point and is a poor thermal and electrical conductor as a solid.
It is a brittle, water-soluble electrolyte that is a poor thermal and electrical conductor as a solid.
It is malleable and is an excellent thermal and electrical conductor as a solid.
- 8. Multiple Choice
The structure of one form of boron nitride is represented above. This form of boron nitride is one of the hardest substances known. Which of the following best helps explain why boron nitride is so hard?
Boron ions and nitrogen ions are held together by ionic bonds.
Boron nitride is a network solid of atoms connected by covalent bonds with fixed bond angles.
Boron nitride is an alloy, and alloys are typically harder than the elements used to make them.
Boron nitride is a polymer made of long chains of boron atoms and nitrogen atoms held together by dispersion forces.
- 9. Multiple Choice
Three substances were studied in the laboratory, and the data in the table above were collected. Based on the data, which of the following shows the type of bonding in each substance?
Substance X: Network covalent; Substance Y: Ionic; Substance Z: Metallic
Substance X: Ionic; Substance Y: Molecular; Substance Z: Network covalent
Substance X: Molecular; Substance Y: Network covalent; Substance Z: Metallic
Substance X: Network covalent; Substance Y: Metallic; Substance Z: Ionic
- 10. Multiple Choice
An unknown substance is found to have a moderately low melting point, it does not dissolve in hexane but it dissolves in water. It neither conducts electricity as a solid nor does it conduct electricity when dissolved in water. Which type of solid is this?
Ionic
Network Covalent
Molecular
Metallic
- 11. Multiple Choice
Which type of solid has mobile electrons in the crystal (sea of electrons)?
Ionic
Molecular
Metallic
Covalent Network
- 12. Multiple Choice
Which statement is true about the properties of solids?
Metallic solids have a high melting point.
Network solids are generally not soluble in water.
Molecular solids do not dissolve easily in water.
All ionic solids are similar in density.
- 13. Multiple ChoiceWhat property gives metallic solids the ability to conduct electricity well, but not covalent network solids?Electrons in metallic solids are strongly bound in placeElectrons in covalent network solids are freely moving aroundCovalent network solids are not bound to other atomsMetallic solids have many electrons that are not bound and can move about the solid
- 14. Multiple Choice
A solid where each atom is covalently bonded to several others in various directions is classified as ___
a mesh solid
a network solid
a nexus solid
a tesselation solid
- 15. Multiple ChoiceMolecular solids are made from ______.metalsatomssodiumnon-metals
- 16. Multiple ChoiceIonic bonds are between _______ and ________.nonmetals and nonmetalsmetals and metalsmetals and nonmetalsnone
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