Page 139 - Science Course 2 (Book 1)

Mo5-L2a: What are Covalent Compounds?

Key Concept SUMMARY

What are Covalent Compounds? What are Covalent Compounds?

What are some common properties of covalent A covalent bond forms when atoms share
properties of covalent compounds? valence electrons. The smallest particle of a
covalent compound is a molecule.

O C O

Mo5-L2b What is a Polar Molecule? Chemical formula

is a group of chemical symbols and numbers that
KEY CONCEPTS: represent the elements and the number of atoms of
1. Why is water a polar compound? each element that make up a compound.

Vocabulary A-Z Adenine

Let us learn some vocabulary C H N
5 5 5

Molecule
is a group of atoms held together by covalent Let’s Begin
bonding that acts as an independent unit.

Covalent Compounds

A molecule is a group of atoms held together by
covalent bonding that acts as an independent unit.

A molecule that has a partial positive end and a
partial negative end because of unequal sharing of
electrons is a polar molecule.

Hydrogen
+ atoms +

Water is a polar – –
molecule with positive
Polar molecule charges on one side
is a molecule that has a partial positive end and a and negative on the + + +
partial negative end because of unequal sharing of other side. – – + + –
electrons. + + +
–
– – –
–
Oxygen
Atom
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