pure substance vs. mixture

Element

Compound

Homogeneous
mixture

Heterogeneous
mixture

1

2

1

2

• One type of atom
• Found on the periodic table
• One capital letter

Ne

C

H2

O2

Examples:

Visual Representation

How to Distinguish

​Elemental Molecule

• Two or more types of atom chemically

combined

• Two or more capital letters
• One substance with different elements

HBr

NH3

H2O NaHCO3

Examples:

Visual Representation

How to Distinguish

Multiple Choice

Study the diagram. Which of the following is represented in the diagram?

• monoatomic element

• elemental molecules

• compound molecules

Multiple Choice

Study the diagram. Which of the following is represented in the diagram?

• monoatomic element

• elemental molecules

• compound molecules

Multiple Choice

Study the diagram. Which of the following is represented in the diagram?

• monoatomic element

• elemental molecules

• compound molecules

Multiple Choice

What is this?

• element

• compound

• mixture

Multiple Choice

What is this?

aluminum (Al)

• monoatomic element

• compound

• elemental molecule

Multiple Choice

All of the following are elemental molecules EXCEPT:

• carbon

  C₄

• nitrogen

  N₂

• oxygen

  O₃

• water

  H₂O

Multiple Choice

All of the following are compounds EXCEPT:

• hydrogen

  H

• sodium chloride

  NaCl

• water

  H₂O

• carbon dioxide

  CO₂

• Looks like one substance
• One phase
• Two or more substances
• “NaCl and H2O”

• Anything dissolved in H2O
• Salt Water
• Air (“O2 and N2 and CO2”)

Examples:

How to Distinguish

• Can see separation of

different substances

• Two or more phases

• Oil and Vinegar
• Granite
• Potting Soil

Examples:

How to Distinguish

Multiple Choice

Chicken noodle soup is

• Homogeneous mixture

• Heterogeneous mixture

Multiple Choice

A bottle of dishwashing detergent contains a label on the back. The label has a long list of ingredients, including water, sodium lauryl sulfate, fragrance, and Blue dye #5.

What can you infer about the material in the bottle from this label and the appearance of the liquid?

• It is a heterogeneous mixture.

• It is a homogeneous mixture.

Element

Compound

Homogeneous
mixture

Heterogeneous
mixture

1

2

1

2

Multiple Choice

What is gold?

• Element

• Compound

• Homogenous mixture

• Heterogenous mixture

Multiple Choice

What is hot cocoa?

• Element

• Compound

• Homogenous Mixture

• Heterogenous mixture

Multiple Choice

What is carbon dioxide (CO₂)?

• Element

• Compound

• Homogenous Mixture

• Heterogenous Mixture

Multiple Choice

What is soda?

• Homogenous Mixture

• Heterogenous Mixture

• Element

• Compound

Multiple Choice

What is neon (Ne)?

• Element

• Compound

• Homogenous Mixture

• Heterogenous Mixture

Multiple Choice

What is pizza?

• Element

• Compound

• Homogenous Mixture

• Heterogenous Mixture

Multiple Choice

What is water (H₂O)?

• Element

• Compound

• Homogenous Mixture

• Heterogenous Mixture

​Exit Slip- Match It!

Match

Match the following models to their correct descriptions.

mixture of elements

mixture of elements and compounds

mixture of compounds

elements

compounds

• mixture of elements

• mixture of elements and compounds

• mixture of compounds

• elements

• compounds