Covalent Bonding & Lewis Structures Checkpoint

Molecular compounds have relatively high boiling points.

• True

• False

Covalent bonds exist when combining atoms give up or accept electrons.

• True

• False

A polar bond is when two nonmetal atoms equally share electrons.

• True

• False

Generally covalent molecules are poor conductors

• false

• true

Tags

NGSS.HS-PS1-3

Electrons are ________________ to form ionic bonds and electrons are ________________ to form covalent bonds.

• transferred; shared

• shared; transferred

• lost; gained

• gained; lost

Tags

NGSS.HS-PS1-1

Which of the following is a property of molecular (covalent) compounds?

• High melting and boiling points

• Conduct electricity in solid state

• Low melting and boiling points

• Form ionic bonds

Tags

NGSS.HS-PS1-1

Why can hydrogen never have more than 2 electrons around it?

• Because hydrogen can only form one bond

• Because hydrogen has only one electron

• Because hydrogen's valence shell can only hold 2 electrons

• Because hydrogen is a noble gas

Why is this Lewis Structure incorrect? Select all that apply.

• H atoms can only form single bonds before their octet is fulfilled.

• There must be a triple bond between C and N to fulfill the octet of all atoms.

• Not enough valence are pictured in the diagram.

• Hydrogen needs more electrons.

• Carbon is missing a lone pair in order to satisfy it's octet.

Tags

NGSS.HS-PS1-2

Which of the following is the correct Lewis dot structure for the molecule fluorine (F₂)?

With only 2 elements there is no real central atom.

• A

• B

• C

• D

Tags

NGSS.HS-PS1-1

What is the correct structure for BF₃?

• Option A.
• Option B. 
• Option C.
• Option D.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2