Worksheet: Covalent Structures

In this worksheet, we will practice describing common features of covalent structures and linking their material properties to their chemical structures.

Q1:

Which of the following properties can generally be used to differentiate a molecular solid from a covalent network?

  • AElectrical conductivity
  • BMelting point
  • CColor
  • DChemical reactivity
  • EBrittleness

Q2:

At room temperature and pressure, the most stable form of sulfur is the simple molecule S8. However, heating the material to a high temperature can produce continuous chains of sulfur atoms. Which term best describes the type of structure displayed by high-temperature sulfur?

  • AIonic
  • BMetallic
  • CAtomic
  • DSimple molecular
  • EGiant covalent

Q3:

In solids displaying simple molecular structures, which type of bonding is typically present?

  • ACovalent
  • BMetallic
  • CIonic

Q4:

Which feature of simple molecular covalent structures is responsible for their low melting and boiling points?

  • AStrong intermolecular forces
  • BInability to crystallize
  • CRepulsive intermolecular forces
  • DWeak intermolecular forces
  • ENo intermolecular forces

Q5:

Which of the following is an example of a giant covalent structure?

  • AWater
  • BSodium chloride
  • CDiamond
  • DIron
  • ECarbon dioxide

Q6:

Which of the following is a common property of giant covalent structures?

  • AFlexibility
  • BHigh density
  • CHigh elasticity
  • DHigh melting point
  • EColorfulness

Q7:

Which of the following is not a characteristic of solids with giant covalent structures?

  • AHigh water solubility
  • BHigh melting point
  • CLow electrical conductivity
  • DHigh level of hardness

Q8:

For which of the following applications are diamond or silicon dioxide not the ideal substances to be used?

  • AMaking glass
  • BSandpaper
  • CDrilling
  • DElectrodes
  • EJewelry

Q9:

Silicon dioxide (silica) forms a giant covalent structure similar to diamond’s. Which of the following diagrams best represents the structure of silica?

  • A
  • B
  • C
  • D

Q10:

The graph shows the melting point for four different elements. Which of the following elements is most likely to exist in bulk as a simple molecular solid?

  • AGermanium
  • BSilicon
  • CBoron
  • DSulfur

Q11:

Why do giant covalent structures have such high melting points?

  • AThe electrostatic attraction between positively charged and negatively charged ions is very strong.
  • BThe intermolecular forces are very strong and require a lot of energy to break.
  • CThere are no free electrons to conduct thermal energy.
  • DCovalent bonds are very strong and require a lot of energy to break.
  • ECovalent bonds are very weak and require a lot of energy to break.

Q12:

Which of the following is not a property shared between diamond and silicon dioxide?

  • AInsoluble in water
  • BForming a giant covalent structure
  • CLow electrical conductivity
  • DVery high melting point
  • EEach atom being covalently bonded to four other atoms

Q13:

Diamond is one of the hardest materials found on Earth. Which of the following features of diamond’s structure is responsible for its hardness?

  • ADiamond forms hollow, cage-like structures.
  • BDiamond forms layers of carbon atoms stacked on top of each other.
  • CDiamond forms four covalent bonds, giving it a very rigid structure.
  • DDiamond forms three covalent bonds, resulting in delocalized electrons.
  • EDiamond forms strong electrostatic attractions between oppositely charged ions.

Q14:

Which of the following giant structures does not conduct electricity?

  • AMolten magnesium oxide
  • BGraphite
  • CDiamond
  • DSodium chloride dissolved in water

Q15:

Which of the following properties do giant covalent and giant ionic structures both share?

  • AHigh melting point
  • BSolubility in water
  • CFormation by the electrostatic attraction of oppositely charged ions
  • DConducting electricity when molten
  • ELow melting point

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