Pure Substances and Mixtures
All substances are classified as elements, compounds, or mixtures. Mixtures may be
homogeneous or heterogeneous. A chemistry class collected and classified the samples listed
below.
• table salt
• dirt from the woods
• classroom air
• copper wire
1. Identify the sample that is classified as an element. Explain your reasoning.
2. Identify the sample that is classified as a homogeneous mixture. Explain your
reasoning.
Pure Substances and Mixtures
All substances are classified as elements, compounds, or mixtures. Mixtures may be
homogeneous or heterogeneous. A chemistry class collected and classified the samples listed
below.
• table salt
• dirt from the woods
• classroom air
• copper wire
3. Identify the sample that is classified as a single compound. Explain your reasoning.
4. Identify the sample that is classified as a heterogeneous mixture. Explain your
reasoning.