Grade 7 Science Solutions. Solutions… a review zA homogeneous mixture ie. they appear as ONE substance Examples: tap water, vinegar, gold jewelry, etc.

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Presentation transcript:

Grade 7 Science Solutions

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

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

Dissolving... zTo mix completely ie. the solute dissolves into the solvent. zSome substances are able to dissolve better than others.

zThe Particle Theory of Matter states that “there are attractive forces between the particles”.

zIn 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.

zIf 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)

Soluble or Insoluble? soluble insoluble

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? Complete Activity 8-1C Page 259

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

Soda Solute: carbon dioxide Solvent: water Gas Liquid

Vinegar Solute: acetic acid Solvent: water Liquid

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

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