Pure Substances and Mixtures

What is the difference between a pure substance and a mixture?

• A pure substance has a fixed composition, while a mixture can be physically separated.

• A pure substance is always a liquid, while a mixture is always a solid.

• A pure substance can be separated by physical means, while a mixture cannot.

• A pure substance is always a compound, while a mixture is always an element.

What are two different types of mixtures and an example of each?

• Homogeneous (salt water) and heterogeneous (salad)

• Solid (ice) and liquid (water)

• Element (oxygen) and compound (water)

• Chemical (acid) and physical (base)

Classify the following: A pail of sand and water.

• Homogeneous mixture

• Heterogeneous mixture

• Pure substance

• Compound

Classify the following: Air.

• Homogeneous mixture

• Heterogeneous mixture

• Pure substance

• Element

Classify the following: Salt and pepper.

• Homogeneous mixture

• Heterogeneous mixture

• Pure substance

• Compound

Classify the following: Banana split.

• Homogeneous mixture

• Heterogeneous mixture

• Pure substance

• Element

Classify the following: Chocolate syrup.

• Homogeneous mixture

• Heterogeneous mixture

• Pure substance

• Compound

Classify the following: Italian dressing.

• Homogeneous mixture

• Heterogeneous mixture

• Pure substance

• Element

Determine if salt water is a pure substance or a mixture.

• Pure substance

• Mixture

• Element

• Compound

Determine if calcium chloride is a pure substance or a mixture.

• Pure substance

• Mixture

• Element

• Homogeneous mixture