1.4 Composition of Mixtures

• A homogeneous mixture has a uniform composition throughout
• Heterogeneous mixtures have a uniform composition.

  False
• In a solution with 20g of salt dissolved in 100g of water, the salt is 16.67% by mass
• Mixtures are classified into homogeneous and heterogeneous types.


  True
• Homogeneous mixtures have a single phase
• Which method separates solids from liquids using a filter?

  Filtration
• What is the formula for molarity?

  Moles of solute / Liters of solution
• What is an example of a heterogeneous mixture in everyday life?

  Trail mix
• Heterogeneous mixtures have multiple phases and appear non-uniform.


  True
• Homogeneous mixtures have a single phase
• What principle does filtration use to separate mixtures?

  Separates solids from liquids
• What is the formula for molality?

  $m =$$\frac{\text{Moles of solute}}{\text{Kilograms of solvent}}$
• Heterogeneous mixtures have multiple phases.


  True
• Evaporation vaporizes a liquid to leave a solid behind
• Molality is measured in moles of solute per kilogram of solvent
• What is a mixture in chemistry?

  Two or more substances not chemically bonded
• What is the key difference in component distribution between homogeneous and heterogeneous mixtures?

  Evenly vs. unevenly distributed
• Order the following methods based on their primary separation principle:

  1️⃣ Evaporation: Vaporizes a liquid to leave a solid behind

  2️⃣ Distillation: Separates liquids based on boiling points

  3️⃣ Chromatography: Separates substances based on affinity for a stationary phase
• What is a mixture?

  Combination of two substances
• A homogeneous mixture has a uniform composition
• What is an example of a homogeneous mixture?

  Air
• Distillation separates liquids based on their boiling points.

  True
• A solution with 20g salt in 100g water has a 16.67% salt concentration by mass.


  True