1.2 Mixtures

• What is a mixture defined as in chemistry?

  Combination of pure substances
• What can vary in a mixture?

  Composition
• How are mixtures separated?

  Physical methods
• Homogeneous mixtures have a uniform composition throughout.


  True
• Heterogeneous mixtures have a non-uniform composition.


  True
• What is an example of a homogeneous mixture?

  Salt water
• What type of composition do homogeneous mixtures have?

  Uniform
• A heterogeneous mixture has a non-uniform composition and distinct phases
• Match the property with the correct type of mixture:

  Uniform composition ↔️ Homogeneous

  Non-uniform composition ↔️ Heterogeneous
• In a homogeneous mixture, components are visually distinguishable.

  False
• What is the composition of a heterogeneous mixture?

  Non-uniform
• The components of a mixture retain their individual properties.

  True
• Arrange the following in order from uniform to non-uniform composition:

  1️⃣ Homogeneous mixtures

  2️⃣ Heterogeneous mixtures
• What are the distinct components of a heterogeneous mixture called?

  Phases
• Match the property with the type of mixture:

  Uniform composition ↔️ Homogeneous mixture

  Non-uniform composition ↔️ Heterogeneous mixture
• A mixture is a combination of two or more pure substances that are not chemically bonded together, and its composition can vary
• Give an example of a homogeneous mixture.

  Salt water
• What is a key difference between homogeneous and heterogeneous mixtures in terms of appearance?

  Single vs. multiple phases
• A heterogeneous mixture has distinct phases and a non-uniform composition
• Match the property with the correct type of mixture:

  Uniform composition ↔️ Homogeneous

  Multiple phases ↔️ Heterogeneous
• Filtration is used to separate sand from water.

  True
• The composition of a mixture can vary.


  True
• Match the property with the type of substance:

  Chemical Composition ↔️ Fixed for pure substances

  Separation ↔️ Physical methods for mixtures

  Melting/Boiling Point ↔️ Not fixed for mixtures
• Components in a homogeneous mixture cannot be visually distinguished.


  True
• A mixture is a combination of two or more pure substances that are not chemically bonded
• Mixtures have a fixed melting or boiling point.

  False
• Mixtures do not have a fixed melting or boiling
• What are the components of a homogeneous mixture like?

  Evenly distributed
• A homogeneous mixture has a uniform composition
• What gases make up air, a homogeneous mixture?

  Nitrogen, oxygen
• In a homogeneous mixture, components are evenly distributed and cannot be visually distinguished.


  True
• Trail mix is an example of a heterogeneous mixture.


  True
• What is the composition of a homogeneous mixture?

  Uniform
• What is the defining characteristic of a homogeneous mixture?

  Uniform composition
• Filtration is a technique to separate mixtures based on particle size.
• Order the following techniques based on their separation principle:

  1️⃣ Filtration (particle size)

  2️⃣ Evaporation (boiling points)

  3️⃣ Distillation (boiling points)

  4️⃣ Chromatography (solubilities)
• What happens to the individual properties of components in a mixture?

  They are retained
• Pure substances have a fixed melting or boiling point.


  True
• Homogeneous mixtures have a uniform composition throughout.
• What type of composition do heterogeneous mixtures have?

  Non-uniform