36 Questions
What is the purpose of a Lewis structure?
To represent the distribution of valence electrons around an atom.
What is the definition of a lone pair in a Lewis structure?
A pair of electrons that participates in nonbonding interactions.
How is the central atom determined when drawing a Lewis structure?
It is the atom with the least electronegativity value.
In drawing Lewis structures, what do multiple bonds represent?
The sharing of two electron pairs.
How many valence electrons does carbon have?
4
Which element must be at the center when drawing the Lewis structure of Ammonia (NH3)?
Nitrogen (N)
What is the main factor that determines the polarity of a molecule?
Difference in electronegativity
In a polar covalent bond, what is the range of electronegativity difference between atoms?
0.5-1.7
What type of bond is formed when the electronegativity difference is greater than 1.7?
Ionic bond
What does the Lewis symbol of an element represent?
Valence electrons
Which electrons are involved in chemical bonding?
Valence electrons
Why do atoms adopt specific positions relative to each other in a molecule?
To maximize bond strengths
What does the VSEPR theory aim to predict?
Molecular geometry based on valence shell electron bond pairs
Which term refers to the three-dimensional arrangement of atoms in a molecule?
Molecular Geometry
In VSEPR theory, how are atoms generally spatially arranged in molecules?
At angles of 90°, 109.5°, 120°, and 180°
What is the role of the central atom in a Lewis structure?
It is the atom from which all other atoms are bonded directly or indirectly
Which term describes a molecule with non-symmetrical molecular structure?
Bent molecular
What can be predicted using the Lewis structure of a molecule?
Three-dimensional shape or geometry of the molecule
What is the definition of a lone pair in a Lewis structure?
The pair of electrons that do not take part in bonding (nonbonding electrons)
Who proposed the idea of covalent bonding and emphasized the importance of electron pairs in bonding?
Gilbert Newton Lewis
How many valence electrons are there in Carbon? In Oxygen?
C=4; O=6
What element must be in the center when drawing the Lewis structure of a compound?
The element with the least electronegativity value
What is the chemical formula of Carbon Dioxide?
CO2
If two bonding electrons can be represented by a single line, how should four bonding electrons be represented?
By drawing a double bond
What is the purpose of the Valence-Shell Electron Pair Repulsion (VSEPR) theory?
To predict molecular geometry based on the number of valence shell electron bond pairs.
Define lone pair electrons in a Lewis structure.
Pairs of valence electrons that are not involved in bonding.
How are atoms generally spatially arranged in molecules according to the VSEPR theory?
In angles of 90°, 109.5°, 120°, and 180°.
What is the role of the central atom in a Lewis structure?
To connect and bond with other atoms.
What does the Lewis structure of a molecule help predict?
The three-dimensional shape of the molecule.
How can the polarity of a molecule be determined?
By assessing the electronegativity difference between atoms.
What is the range of electronegativity difference for a polar covalent bond?
0.5-1.7
What type of bond is formed when the electronegativity difference is greater than 1.7?
Ionic bond
What do lone pair electrons contribute to in a molecule?
Shape and structure
What do valence electrons determine in an atom?
Chemical bonding
How are electrons shared in a nonpolar covalent bond?
Equally
What is the main factor that determines the polarity of a molecule?
Electronegativity difference
Learn to determine the Lewis dot structures of Ammonia (NH3) and Carbon Tetrachloride (CCl4) in this 10-minute activity. Explore the Valence-Shell Electron Pair Repulsion Theory (VSEPR theory) to predict the molecular geometry of compounds based on valence shell electron bond pairs.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
