ChemAcc Unit 5 Bonding & LDS

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds with other atoms.

Front

How do you determine the total number of valence electrons in a molecule?

Back

To determine the total number of valence electrons in a molecule, add the valence electrons of each atom in the molecule, considering any charges.

Front

What is a Lewis Dot Structure?

Back

A Lewis Dot Structure is a diagram that represents the valence electrons of an atom and how they are arranged in a molecule.

Front

What is the bond angle in a water molecule (H2O)?

Back

The bond angle in water is less than 109.5° due to the presence of two lone pairs of electrons.

Front

Which atom is never in the center of a Lewis Dot Structure?

Back

Hydrogen (H) is never in the center of a Lewis Dot Structure because it can only form one bond.

Front

What is the shape of a molecule with a trigonal planar geometry?

Back

A trigonal planar geometry has three atoms bonded to a central atom, all in the same plane, with bond angles of 120°.

Front

How many total valence electrons are in the perchlorate ion (ClO4-)?

Back

The perchlorate ion (ClO4-) has a total of 32 valence electrons.

Front

What is the significance of lone pairs in determining molecular shape?

Back

Lone pairs occupy space and can affect the bond angles and overall shape of a molecule.

Front

What is the correct Lewis Dot Structure for the molecule fluorine (F2)?

Back

The correct Lewis Dot Structure for fluorine (F2) shows two fluorine atoms sharing a pair of electrons.

Front

What is the bond angle in a tetrahedral molecule?

Back

The bond angle in a tetrahedral molecule is 109.5°.