Covalent Bonds
Presentation
•
Chemistry
•
8th Grade
•
Hard
Standards-aligned
Evanti Yap
Used 7+ times
FREE Resource
6 Slides • 8 Questions
1
Covalent bonding occurs in elements and compounds containing non-metallic elements only and is formed when pairs of electrons are shared.
A shared pair of electrons is known as a single bond.
All which form a covalent bond join together to form uncharged molecules. All the atoms involved achieve a full outer shell of electrons.
for Hydrogen, it has only 1 electron which make it share the only electron. The total electrons after bonded for hydrogen is only 2 electrons (duplet).
the rest atoms must be octet (8 electrons), but for period 3 and above, they can make more than 8 electrons.
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2
1 electron shared by each hydrogen
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Hydrogen (H2)
3
Cl2 = 1 electron shared by each chlorine atom
H2O = 1 electron shared by each hydrogen, to form two single covalent bonds
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Cl2 and H2O
4
Multiple Choice
Which diagram shows the arrangement of the outer shell electrons in a molecule of water?
5
Multiple Choice
The structure of propane, C3H8, is shown.
How many electrons are involved in the bonding of propane?
8
10
16
20
6
Draw
Sodium reacts with chlorine to form sodium chloride.
Which row describes the bonding in the three substances?
7
Multiple Choice
How many electrons are used to form covalent bonds in a molecule of methanol, CH3OH?
5
6
8
10
8
THREE electrons are shared by two atoms
e.g. N2
Triple bonds
TWO electrons are shared by two atoms
e.g. CO2
Double bonds
9
Draw
Which row identifies compounds that contain single covalent bonds only, double covalent bonds only or both single and double covalent bonds?
10
Multiple Choice
Ethene is an unsaturated hydrocarbon.
Which description of the bonding in ethene is correct?
All atoms in the molecule have a share of eight electrons.
Each carbon atom shares two of its electrons with hydrogen atoms and two of its electrons with a carbon atom.
Each carbon atom shares two of its electrons with hydrogen atoms and one of its electrons with a carbon atom.
The two carbon atoms share a total of six electrons with other atoms.
11
Multiple Choice
The molecular structure of hydrazine, N2H4, is shown.
Which description of the bonding in hydrazine is not correct?
Each nitrogen atom has a non-bonding pair of electrons.
Each nitrogen atom has four bonding pairs of electrons.
Each nitrogen atom shares one of its electrons with a nitrogen atom.
Each nitrogen atom shares two of its electrons with hydrogen atoms.
12
Multiple Choice
Which diagram shows the outer shell electron arrangement in a molecule of methanol, CH3OH?
13
Physical Properties
low melting and boiling point, somehow found as gas molecules, due to weak intermolecular forces between molecules
mostly cannot dissolve in water, but can dissolve in covalent solvents, such as propane
cannot conduct electricity because there is no moving electrons
cannot conduct heat
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14
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Some text here about the topic of discussion
Covalent bonding occurs in elements and compounds containing non-metallic elements only and is formed when pairs of electrons are shared.
A shared pair of electrons is known as a single bond.
All which form a covalent bond join together to form uncharged molecules. All the atoms involved achieve a full outer shell of electrons.
for Hydrogen, it has only 1 electron which make it share the only electron. The total electrons after bonded for hydrogen is only 2 electrons (duplet).
the rest atoms must be octet (8 electrons), but for period 3 and above, they can make more than 8 electrons.
Some text here about the topic of discussion
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