1.2 Mixtures

• Homogeneous mixtures have uniform composition throughout.


  True
• Match the type of mixture with its definition:

  Homogeneous ↔️ Components are uniformly distributed

  Heterogeneous ↔️ Components are not uniformly distributed
• Heterogeneous mixtures have visible variations within the mixture.

  True
• What is an example of a heterogeneous mixture in food?

  Salad
• What is the key difference between a mixture and a compound in terms of bonding?

  Mixtures have no chemical bonds
• How are mixtures formed?

  Physically combined substances
• Examples of mixtures include air, salad, and salt water
• A mixture is a combination of two or more substances that are physically combined but not chemically bonded
• What property makes homogeneous mixtures appear the same everywhere?

  Uniform distribution
• Trail mix is an example of a heterogeneous mixture because the components are not evenly dispersed
• Physical separation methods require breaking chemical bonds to isolate components.

  False
• What is a mixture defined as?

  Two or more substances physically combined
• What is an example of a homogeneous mixture?

  Salt water
• Describe the uniformity and composition of salt water in a homogeneous mixture.

  Uniform, salt dissolved in water
• What materials are combined in concrete to form a heterogeneous mixture?

  Cement, sand, gravel, water
• Mixtures are formed when substances are physically combined
• Chemical bonds are formed during the formation of mixtures.

  False
• What are the two types of mixtures based on uniformity?

  Homogeneous and heterogeneous
• Match the type of mixture with its definition:

  Homogeneous ↔️ Components are uniformly distributed

  Heterogeneous ↔️ Components are not uniformly distributed
• Match the homogeneous mixture with its description:

  Salt water ↔️ Solution of salt in water

  Air ↔️ Mixture of gases

  Brass ↔️ Alloy of copper and zinc

  Rubbing alcohol ↔️ Solution of isopropyl alcohol and water
• What happens to components in a heterogeneous mixture?

  Not evenly distributed
• Match the mixture with its type and a brief description:

  Coffee ↔️ Homogeneous: Dissolved substances blend evenly

  Salad ↔️ Heterogeneous: Different vegetables are not evenly distributed

  Air ↔️ Homogeneous: Gases mix uniformly

  Granite ↔️ Heterogeneous: Contains different minerals visible
• Heterogeneous mixtures have components that are not uniformly distributed
• Homogeneous mixtures appear the same everywhere
• In homogeneous mixtures, the components are uniformly distributed, while in heterogeneous mixtures, they are not uniformly distributed
• What is an example of a compound?

  Water (H₂O)
• Chemical methods are required to separate mixtures into their elements.

  False
• Why are compounds fundamentally different from mixtures?

  Fixed composition
• Salad is an example of a heterogeneous mixture
• Concrete is a heterogeneous mixture.


  True
• Order the following physical separation methods based on their primary purpose:

  1️⃣ Filtration: Separates solid from liquid

  2️⃣ Distillation: Separates liquids with different boiling points

  3️⃣ Chromatography: Separates components based on movement rates

  4️⃣ Centrifugation: Separates components with different densities

  5️⃣ Evaporation: Removes a volatile liquid from a non-volatile solid
• What is an example of a heterogeneous mixture?

  Concrete
• What gases make up air in a homogeneous mixture?

  Nitrogen, oxygen, carbon dioxide
• Heterogeneous mixtures have components that lead to visible differences in composition and appearance.


  True
• How can mixtures be separated into their components?

  Physical methods
• What type of composition do compounds have?

  Fixed composition
• Homogeneous mixtures have components that are not uniformly distributed.

  False
• Air is an example of a homogeneous mixture.


  True
• Which gas is the most abundant in air?

  Nitrogen
• Which physical separation method separates a solid from a liquid by trapping the solid particles?

  Filtration