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grade 8 ppt on mixtures and solutions

grade 8 ppt on mixtures and solutions

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  • 1. Answer the following questions:
    • What type of cell is this?
    • What are the green structures in the cell?
    • What is the name of the structure that give the cell shape and support?
    • This organelle is the control center of the cell.
    • This organelle packages materials and sends them around or out of the cell.
  • 2. Chapter 4 Section 3 – Mixtures
  • 3. Describe the three properties of mixtures.
    • Mixture: a combination of two or more substances not chemically combined
    • 1. No chemical change occurs. After mixing, each substance keeps its identity.
    • 2. Mixtures can be separated through physical means.
    • 3. Mixtures do not have a specific ratio of components as compound do.
  • 4. Describe four methods of separating the parts of a mixture.
    • Separating mixtures:
    • 1. Distillation – separates mixtures according to boiling points
    • 2. Magnets – separate iron from a mixture
    • 3. filtration – separates mixtures according to particle size.
    • 4. Centrifuge – separates a mixture by particle density.
    • (Blood)
  • 5.  
  • 6. Analyze a solution in terms of its solute and solvent.
    • Solutions: a mixture that appears to be a single substance.
    • Two or more substances are distributed evenly among each other.
    • Particles dissolve, or separate and spread evenly.
    • Solutions are homogeneous mixtures
    • solute – substance that is dissolved
    • solvent – substance in which the solute dissolves.
    • soluble – will dissolve in a solvent
    • insoluble – substance won’t dissolve in a solvent. Substance formed is not a solution.
  • 7. Common Solutions
    • Salt water: salt -solute, water – solvent
    • Air: Oxygen-solute, nitrogen-solvent
    • Antifreeze: alcohol – solute, water – solvent
    • Alloy: solutions dissolved in metals. Steel: carbon – solute, iron- solvent
  • 8. Particles in a solution:
    • never settle
    • cannot be filtered
    • do not scatter light
  • 9. Explain how concentration affects a solution.
    • Concentration: the amount of solute dissolved in the solvent. (g/ml)
    • It can be concentrated or dilute.
  • 10.  
    • Solids are more soluble in liquids at higher temperatures.
    • Gases are more soluble in liquids at lower temperature.
    Solubility: the ability of a solute to dissolve in a solvent at a given temp. or pressure.
  • 11. Methods to increase solubility of a solid:
    • Mixing – causes particles to spread out more quickly.
    • Heating – causes particles to move more quickly
    • Crushing – increases the amount of contact with the solvent
  • 12. Describe the particles in a suspension.  
    • Suspension: a mixture in which particles are dispersed throughout but can be settled out by gravity.
    • Particles in a suspension can:
    • reflect light
    • be filtered
    • settle out over time
  • 13. Explain how a colloid differs from a solution or a suspension.
    • Colloid: a solution where the particles are dispersed throughout but are not heavy enough to settle out.
    • Milk, Jello, deodorant, shaving cream are colloids.
  • 14. Particles in a colloid
    • 1. can scatter light
    • 2. cannot be separated by a filter
    • 3. will not settle over time