SCIENCE W1 Q1

• Homogeneous mixture
• Mixture is a combination of two or more substances present in varied proportion
• Mixture


  A combination of two or more substances present in varied proportion
• Homogeneous mixture


  Contains substances that are evenly mixed and is uniform throughout in terms of physical appearance
• Heterogeneous mixture


  Contains component substances that are usually easy to distinguish
• Types of mixtures


  • Homogeneous mixtures
  • Heterogeneous mixtures
• Homogeneous mixtures characteristics


  • Uniform composition
  • Particles not visible by naked eye
  • Particles cannot be separated by filtration
  • Stable mixtures
  • Particles do not settle down
  • Path of a beam of light is not visible
• Heterogeneous mixtures characteristics


  • Non-uniform composition
  • Particles visible by naked eye
  • Particles can be separated by filtration
  • Unstable mixtures
  • Particles settle down
  • Path of a beam of light is visible
• Homogeneous mixtures


  • Mixture of sugar in water
  • Mixture of salt in water
  • Air
  • Sweet tea
  • Orange juice
• Heterogeneous mixtures


  • Mixture of salt and sand
  • Mixture of oil and water
  • Fruit salad
  • Milk and cereals
  • Pizza
• Halo Halo is an example of a mixture
• The gloves, face mask, and disinfectant solution are examples of mixtures
• Colloids can be classified based on the physical state of dispersion medium and disperse space
• Types of homogeneous mixtures

  • Solid homogeneous mixtures
  • Liquid homogeneous mixtures
  • Gaseous homogeneous mixtures
• Solid homogeneous mixtures


  • Brass
  • Halo Halo
• Liquid homogeneous mixtures


  • Wine
  • Milk
• Gaseous homogeneous mixtures


  • Air
  • Neon signs
• Steps to identify mixtures

  1. Mix materials

  2. Observe appearance

  3. Classify as homogeneous or heterogeneous
• Suspensions and colloids are the two forms of heterogeneous mixtures
• Air is a mixture of oxygen, nitrogen, argon, carbon dioxide, and other elements
• Mixtures can be natural or man-made
• Much of the food we eat are heterogeneous mixtures
• Colloidal dispersion medium can be gas, liquid, or solid
• Solutions can be classified as liquid, solid, or gas
• Salt dissolves in water; salt is the solute and water is the solvent
• Sugar dissolves in water; sugar is the solute and water is the solvent
• Sand does not dissolve in water; sand is insoluble
• Mixtures of sugar and water are homogeneous
• Mixtures of oil and water are heterogeneous
• Mixtures of salt and pepper are heterogeneous
• Mixtures of milk and cereals are heterogeneous
• Mixtures of muddy water are heterogeneous
• Mixtures of juice drinks are homogeneous
• Mixtures of gravel and sand are heterogeneous
• Mixtures of Halo Halo are heterogeneous
• Mixtures of body lotion are colloids
• Mixtures of toothpaste are colloids
• Mixtures of flour and water are suspensions
• Mixtures of sugar and water are solutions
• Mixtures of salt and water are solutions