Answer the following questions: <ul><li>What type of cell is this? </li></ul><ul><li>What are the green structures in the ...
Chapter 4  Section 3 – Mixtures
Describe the three properties of mixtures. <ul><li>Mixture: a combination of two or more substances not chemically combine...
Describe four methods of separating the parts of a mixture. <ul><li>Separating mixtures: </li></ul><ul><li>1. Distillation...
 
Analyze a solution in terms of its solute and solvent. <ul><li>Solutions: a mixture that appears to be a single substance....
Common Solutions <ul><li>Salt water: salt -solute, water – solvent </li></ul><ul><li>Air: Oxygen-solute, nitrogen-solvent ...
Particles in a solution: <ul><li>never settle </li></ul><ul><li>cannot be filtered </li></ul><ul><li>do not scatter light ...
Explain how concentration affects a solution. <ul><li>Concentration: the amount of solute dissolved in the solvent. (g/ml)...
  <ul><li>Solids are more soluble in liquids at higher temperatures. </li></ul><ul><li>Gases are more soluble in liquids a...
Methods to increase solubility of a solid: <ul><li>Mixing – causes particles to spread out more quickly. </li></ul><ul><li...
Describe the particles in a suspension.   <ul><li>Suspension: a mixture in which particles are dispersed throughout but ca...
Explain how a colloid differs from a solution or a suspension. <ul><li>Colloid: a solution where the particles are dispers...
Particles in a colloid <ul><li>1. can scatter light </li></ul><ul><li>2. cannot be separated by a filter </li></ul><ul><li...
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Mixtures

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grade 8 ppt on mixtures and solutions

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Mixtures

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

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