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Grade 7 Science

Grade 7 Science. Solutions. Solutions… a review. A homogeneous mixture ie. they appear as ONE substance Examples: tap water, vinegar, gold jewelry, etc. Solute The substance that dissolves (found in less amounts). Solvent

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Grade 7 Science

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  1. Grade 7 Science Solutions

  2. Solutions… a review • A homogeneous mixture ie. they appear as ONE substance Examples: tap water, vinegar, gold jewelry, etc.

  3. Solute The substance that dissolves (found in less amounts) Solvent The substance in which the solute dissolves (found in the greatest amounts) Solutions have 2 parts:

  4. Solute or Solvent? • A. Brass is used to make many objects. Brass is a solution of zinc metal in a copper metal. • B. Hydrogen peroxide is used to disinfect cuts. Hydrogen peroxide is a solution of 3% hydrogen and 97% water.

  5. Solute or Solvent? • C. Dental amalgam is a metal that is used to fill cavities. It is a solution of mercury in tin. • D. Deicing fluid is a cleaner used to clean car and truck windshields. It is made up of a solution of propylene glycol in water.

  6. Dissolving... • To mix completely ie. the solute dissolves into the solvent. • Some substances are able to dissolve better than others.

  7. How are substances soluble? • The Particle Theory of Matter states that “there are attractive forces between the particles”.

  8. In order to dissolve, the particles must be more strongly attracted to the particles of the solvent than to themselves. This means that the solute is soluble in that solvent.

  9. If something is ABLE to dissolve then it is soluble. • For example, sugar dissolves in water.

  10. How are substances insoluble? • If the particles of the solute are more attracted to their own particles than the solvent particles, dissolving does NOT occur. The solute is said to be insoluble in that solvent. (ie. Mechanical)

  11. If something is UNABLE to dissolve then it is insoluble. • For example, sand does not dissolve in water.

  12. Soluble or Insoluble? soluble insoluble

  13. Solvent or Not? Some materials are good solvents for some solutes but not others. For example, oil is insoluble in water but soluble in gasoline.

  14. Does it Dissolve? Complete Activity 8-1C Page 259

  15. States of Solutes and Solvents Air Solute: oxygen, carbon dioxide, other gases Solvent: nitrogen Gas Gas

  16. Soda Solute: carbon dioxide Solvent: water Gas Liquid

  17. Vinegar Solute: acetic acid Solvent: water Liquid Liquid

  18. Filtered Sea Water Solute: Salt and other minerals Solvent: Water Solid Liquid

  19. Brass Solute: zinc Solvent: copper Solid Solid **Alloy: Solutions made from two or more metals.

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