1.1.3 Distinguishing between mixtures and compounds

• What happens to the properties of substances in a mixture?

  Each substance keeps its own properties
• How do mixtures differ from compounds?

  Mixtures combine substances physically, compounds chemically
• What is a mixture?

  A mixture is a physical combination of substances
• Can compounds be separated by physical means?

  No, they cannot be separated by physical means
• What are the properties of mixtures and compounds?

  • Mixtures:
  • Formation: Physical change
  • Separation: Easily separated
  • Composition: Components keep properties
  • Compounds:
  • Formation: Chemical change
  • Separation: Can't be physically separated
  • Composition: New properties formed
• What are the characteristics of compounds?

  • Fixed composition: Specific ratio of elements
  • New properties: Different from individual elements
  • Difficult separation: Requires chemical reactions
• How are substances in a mixture combined?

  They are physically combined without chemical reaction
• How do compounds differ from mixtures?

  Compounds cannot be separated by physical means
• How is a compound formed?

  When two or more elements chemically combine
• What is a compound?

  A substance formed from two or more elements
• How is water (H2O) formed?

  By chemically combining hydrogen and oxygen
• What gases are primarily found in air?

  Nitrogen and oxygen
• Why is it difficult to separate a compound into its elements?

  A chemical reaction is needed for separation
• What is the significance of a fixed ratio in compounds?

  It determines the composition of the compound
• What happens to the properties of elements when they form a compound?

  The compound has new properties different from the elements
• What is required to separate a compound into its elements?

  A chemical change
• What is the key difference between mixtures and compounds?

  How they're formed and can be separated
• How can you separate sand from water?

  By pouring water through a filter
• What are the physical methods used to separate components of a mixture?

  • Filtration
  • Evaporation
• What happens to the water's properties in the sand and water mixture?

  It stays wet
• What are the three key characteristics of mixtures?

  Components retain properties, variable composition, easy separation
• How can mixtures be separated?

  Easily separated
• What is a compound?

  A substance formed by chemically combining elements
• What are the three main characteristics of compounds?

  Fixed composition, new properties, difficult separation
• What is the chemical formula for water?

  H2O
• What does it mean that components in a mixture retain their properties?

  Each substance keeps its original properties
• What happens to salt in saltwater?

  Salt dissolves but retains its properties
• How do the properties of a compound differ from its individual elements?

  Compounds have new properties different from elements
• How are compounds formed?

  Through a chemical change
• What does easy separation mean in the context of mixtures?

  Components can be separated using physical methods
• How does variable composition apply to mixtures?

  The amount of each substance can vary
• What happens to the properties of components in a compound?

  New properties are formed
• What is the role of carbon dioxide for plants?

  It is used in photosynthesis
• How are mixtures formed?

  Through a physical change
• What is carbon dioxide (CO2) made of?

  Carbon and oxygen
• What are the key differences between mixtures and compounds?

  • Mixtures combine substances physically
  • Compounds chemically combine elements
  • Mixtures retain individual properties
  • Compounds form new substances with different properties
• What does fixed composition mean in the context of compounds?

  Compounds have a specific ratio of elements