*Structure of Matter - Atoms, Molecules and Compounds

​Structure of Matter:
Atoms, Molecules, and Compounds

By Mr. Brekke

Learning target

By the end of this lesson, I will be able to:

• Describe the difference between elements, molecules, and compounds.

• Identify examples of simple molecules and compounds by reading a chemical formula.

• Explain how atoms come together to make molecules and compounds.

Key Vocabulary

Element
An element is a pure substance made of only one kind of atom. Examples include Oxygen (O) and Hydrogen (H).

Molecule
A molecule forms when 2+ atoms join. They can be the same or different atom types.

Compound
A compound is a molecule with 2+ different elements bonded. Water (H₂O) is an example.

Multiple Select

Which of the following are elements?

**Select multiple

• Cl (chlorine)

• NaCl

  (sodium chloride)

• He

  (Helium)

• CO₂

  (carbon dioxide)

Multiple Choice

What is the difference between H and H₂O?

• They are the same.

• H is an element and H2 is a molecule.

• They are made of different elements.

Review

Element

• Substance that cannot be broken down into a simpler form.

• Examples: Hydrogen, Helium, Oxygen, Gold, Magnesium.

• Find them on the Periodic Table of Elements.

​What are Molecules?

A group of two or more atoms held together by chemical bonds.

• Can be the same or different atoms.

Match

Matching:

Which of the following chemical formulas are elements?

Which of the following chemical formulas are molecules?

• H₂O

• O

• O₂

• Co

• CO₂

Molecule

Element

Molecule

Element

Molecule

• Molecule

• Element

• Molecule

• Element

• Molecule

• 2 or more different atoms (elements) bonded together.

• Examples: H₂O, CO₂, or C₆H₁₂O₆

Compound

• 2 or more atoms bonded together.

• Can be the same or different atoms (H₂ or H₂O)

Molecule

Molecule vs compound

Compounds

• Compounds are also Molecules.

• Compounds can be separated by chemical means into their components. For example H₂O can be broken into H₂ and O through chemical reactions.

Multiple Choice

Can a compound also be a molecule?

• Yes

• No

• O

• O₂

• CO₂

• H

• H₂O

• C₆H₁₂O₆

Which of the following are Molecules?
**Think about the definition of a molecule.

Compounds

• H₂O

• C₆H₁₂O₆

• CO₂

Elements

• H

• O

Which of the following are Molecules? (Answers)
**Think about the definition of a molecule.

Molecules

• H₂O

• C₆H₁₂O₆

• O₂

• CO₂

Counting Atoms in chemical Formulas

Chemical formula represents the types (elements) and Number of atoms in a compound/molecule. Example = H₂O or C₆H₁₂O₆

​Chemical Formula	​First Atom	​Second Atom	​Third Atom
O2	​Oxygen (O) = 2	​	​
​H2O	​Hydrogen (H) = 2	​Oxygen (O) = 1	​
​C6H12O6	​Carbon (C) = 6	​Hydrogen (H) = 12	​Oxygen (O) = 6

Exit Ticket - Quiz

Multiple Choice

Remember to use your Periodic Table of Elements to help you identify which Bohr Model is pictured...

• lithium
• potassium
• hydrogen

• boron

Multiple Choice

Remember to use your Periodic Table of Elements to help you identify which Bohr Model is pictured...

• carbon
• beryllium

• neon
• sodium

Multiple Choice

How many hydrogen atoms are there in a water molecule? 

Red = Oxygen

Blue = Hydrogen

• 0
• 1
• 2
• 3

Multiple Choice

How many carbon atoms are there in a methane molecule? 

Red = Carbon

Blue = Hydrogen

• 0
• 1
• 4
• 5