Grade 11 Chemistry Covalent Bonding Quiz

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What is the main characteristic of a molecular compound?

Composed of two different metal elements

Good conductor of electricity and heat

Gaseous or liquid at room temperature (correct)

High melting point compared to ionic compounds

What type of bonding exists in a molecular compound?

Hydrogen bonding

Ionic bonding

Covalent bonding (correct)

Metallic bonding

How are the valence electrons represented in Lewis dot structure?

As dots (correct)

As circles

As lines

As dashes

What is the composition of a diatomic molecule?

Contains only one type of atom Signup and view all the answers

Why do molecular compounds have low melting points compared to ionic compounds?

Ionic bonding is stronger than sharing electron covalent bonding Signup and view all the answers

Which type of bond is formed when two atoms share three electrons?

Triple covalent bond Signup and view all the answers

In the structural formula of molecular compounds, where is the element with the highest number of unpaired electrons and highest electronegativity placed?

In the center Signup and view all the answers

What is a coordinate covalent bond?

A bond formed when one atom contributes both bonding electrons with another atom Signup and view all the answers

What do resonance structures occur for?

When it is possible to draw two or more valid electron dot structures Signup and view all the answers

What is the difference between atomic orbitals and molecular orbitals?

Atomic orbitals are associated with elements, while molecular orbitals are associated with molecules Signup and view all the answers

What is the difference between a single covalent bond and a double covalent bond?

Single covalent bond involves the sharing of one electron, while double covalent bond involves the sharing of two electrons. Signup and view all the answers

Explain the concept of a coordinate covalent bond with an example.

A coordinate covalent bond is formed when one atom contributes both bonding (paired) electrons with another atom that doesn’t have unpaired electrons. An example is the formation of the coordinate covalent bond between oxygen and carbon in carbon monoxide (CO). Signup and view all the answers

What are resonance structures and when do they occur?

Resonance structures occur when it is possible to draw two or more valid electron dot structures that have the same number of electron pairs for a molecule or ion. Signup and view all the answers

Explain the difference between atomic orbitals and molecular orbitals.

Atomic orbitals belong to one element and are shown when writing the configuration of an element. Molecular orbitals belong to molecules, not atoms, and are formed when elements undergo a change in their electron position to form a molecule. Signup and view all the answers

In the Lewis dot structure of methane (CH4), why is carbon placed in the center and how does it share electrons with hydrogen?

Carbon is placed in the center because it has the highest number of unpaired electrons and highest electronegativity. It shares its electrons with the four hydrogen atoms to complete their valence shells. Signup and view all the answers

What is the key characteristic of a diatomic molecule?

Made up from 2 similar atoms Signup and view all the answers

How does the melting point of a molecular compound compare to that of an ionic compound?

Low melting point compared to that of ionic compound Signup and view all the answers

What type of elements make up a molecular compound?

Non-metals elements or metalloids Signup and view all the answers

How are valence electrons represented in a Lewis dot structure?

Valence electrons are represented by dots Signup and view all the answers

What does a structural formula of a molecular compound represent?

Covalent bonds represented by dashes and paired electrons represented by dots Signup and view all the answers