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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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solutions a review
Solutions… a review
  • A homogeneous mixture ie. they appear as ONE substance

Examples: tap water, vinegar, gold jewelry, etc.

solutions have 2 parts
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:
solute or solvent
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.
solute or solvent1
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.
dissolving
Dissolving...
  • To mix completely ie. the solute dissolves into the solvent.
  • Some substances are able to dissolve better than others.
slide7

How are substances soluble?

  • The Particle Theory of Matter states that “there are attractive forces between the particles”.
slide8
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.
slide9

If something is ABLE to dissolve then it is soluble.

  • For example, sugar dissolves in water.
slide10

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)
slide11

If something is UNABLE to dissolve then it is insoluble.

  • For example, sand does not dissolve in water.
soluble or insoluble
Soluble or Insoluble?

soluble

insoluble

solvent or not
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.

does it dissolve

Does it Dissolve?

Complete Activity 8-1C

Page 259

states of solutes and solvents
States of Solutes and Solvents

Air

Solute: oxygen, carbon dioxide, other gases

Solvent: nitrogen

Gas

Gas

slide16

Soda

Solute: carbon dioxide

Solvent: water

Gas

Liquid

slide17

Vinegar

Solute: acetic acid

Solvent: water

Liquid

Liquid

slide18

Filtered Sea Water

Solute: Salt and other minerals

Solvent: Water

Solid

Liquid

slide19

Brass

Solute: zinc

Solvent: copper

Solid

Solid

**Alloy: Solutions made from two or more metals.