WorksheetsCovalent Bonds - Kahn Academy
Total questions: 11
Worksheet time: 55mins
With ionic bonding atoms exchange electrons to bond. How do covalent bonds occur?
by exchanging electrons.
by sharing pairs of electrons
by exchanging protons
by exchanging neutrons
How many valence electrons do oxygen atoms have? OR How many dots does an oxygen Lewis dot diagram have?
2
6
7
8
Having 6 valence electrons, how many valence electrons do ALL oxygen atoms desire to find/claim?
1 more electrons
2 more electrons
4 more electrons
7 more electrons
When 2 oxygen atoms share pairs of electrons, they form ____________ bonds.
covalent
ionic
metallic
Can oxygen form a covalent bond with hydrogen?
yes
no
Hydrogen and oxygen form covalent bonds. Wnen bonded with hydrogen, how many valence electrons does oxygen appear to have?
2
4
6
8
Fluorine is the most electronegative element. When bonding atoms that are very electronegative with atoms that are not so electronegative, what tends to happen to the electrons?
The electrons tend to stay closer to the more electronegative atom
The electrons tend to stay closer to the less electronegative atom
The electrons are equally shared by both atoms
When bonding covalently, if the electrons are unequally shared (the electrons tend to be closer to one atom than the other) is called a ____________ covalent bond.
polar
nonpolar
Carbon with (4 valence electrons) bonds with oxygen (with 6 valence electrons). Predict the most common carbon and oxygen covalently bonded compound.
CO
CO2
C2O4
C4O2
When nitrogen atoms bond with other nitrogen atoms, a nitrogen molecule is formed. Based on the fact that nitrogen has 5 valence electrons, predict the nitrogen's molecular formula?
N
N2
N3
N5
Methane is a polar covalently bonded molecule bonding carbon and hydrogen together. What is methane's chemical formula?
CH
CH2
C2H
CH4
