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Mixtures and Solutions

Mixtures and Solutions. Review. Separating Mixtures. A __________ combines two or more materials without changing them. mixture A __________ forms when a material dissolves in a liquid and cannot be separated with a filter. solution. Separating Mixtures Vocabulary.

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Mixtures and Solutions

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  1. Mixtures and Solutions Review

  2. Separating Mixtures • A __________ combines two or more materials without changing them. mixture • A __________ forms when a material dissolves in a liquid and cannot be separated with a filter. solution

  3. Separating Mixtures Vocabulary • A substance that dissolves in water. • Solute • A substance that dissolves a solute. • Solvent • The process of one material disperses uniformly into another. • Dissolving • Capable of being dissolved. • Soluble

  4. Separating Mixtures • How can mixtures be separated? • Using filters or screens. In class we used filters and screens to separate powder and pebbles. • How can solutions be separated? • Evaporation: When water turns into a gas and appears to disappear it leaves behind the dissolved solid in the form of crystals.

  5. Reaching Saturation • A solution is saturated when ... • As much solid material as possible has dissolved in the liquid. In class we dissolved salt and citric acid in water. Which one is the most soluble? Citric acid because 45-65 grams dissolves campared to 10-15 grams for salt.

  6. Concentration • The amount of substance in a mixture is … - its concentration • The more material dissolved in a liquid the more or less concentrated it is. • MORE • You must compare equal volumes of two liquids to see which one is more concentrated. • What can you do to dilute a solution? • Add more liquid

  7. Which is more concentrated? • Solution 1: 50 ml of water and 2 spoons of salt. • Solution 2: 150 ml of water and 5 spoons of salt. • Solution 3: 200 ml of water and 8 spoons of salt. • Answer: Solution 1 and 3 have the same concentration. Solution 2 is less concentrated.

  8. Fizz Quiz • When a change results from mixing two or more materials, that change is called a … • Chemical reaction • How do you know a chemical reaction has taken place? • Change in temperature • Gas formation • A precipitate is form (A new material)

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