MIXTURES SOLUTIONS NOTES AND REVIEW MIXTURES A mixture

MIXTURES & SOLUTIONS NOTES AND REVIEW

MIXTURES • A mixture is two or more constituents (materials) intermingled or combined, but each material keeps its own properties. • The materials in a mixture do not react chemically and do not create any new substances. • A mixture can be separated back into its original constituents or materials.

DEVICES & PROCEDURES FOR SEPARATING MIXTURES • Strainer • Magnet • Settling • Filter • Evaporation

SOLUTIONS • Solutions are a special kind of mixture in which a substance disappears or dissolves in water to make a clear liquid. This is also know as an aqueous solution. • Aqueous solutions are usually made by dissolving a solid (the solute) in a liquid (the solvent). • A solution can be separated through the process of evaporation.

WHEN YOU MIX OR COMBINE SUBSTANCES…. • Two results can happen: ØNothing new is formed which results in a mixture. ØSomething new is formed which results in a compound

COMPOUNDS • Two or more substances can be combined to create a new chemical compound. • The properties of the original substances do not stay the same in a compound. • For example: flour, eggs, and milk can be combined and cooked to make a pancake. Once this occurs, the flour is no longer powdery and white, the eggs are no longer yellow and runny, and the milk is no longer white, and liquid. Instead, a new substance is formed: a pancake, which has completely different properties than the original flour, eggs, and milk.

REVIEW QUESTIONS 1. What is a mixture? 2. What is a solution? 3. How are mixtures and solutions alike? 4. How are mixtures and solutions different? 5. Which device or procedure would be best for separating a mixture of sand small pebbles. Explain why you think your answer is correct.