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Science Starters: Elements, Molecules, Compounds, and Mixtures

Learn about elements, molecules, compounds, and mixtures in this Science Starters session. Understand the difference between homogeneous and heterogeneous mixtures, and explore solutions and suspensions. Engage in a video clip and complete a practice worksheet.

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Science Starters: Elements, Molecules, Compounds, and Mixtures

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  1. Monday, 10/22 Day 1 1. Please have these Items on your desk. ScienceStarters Sheet Sciencenotebook Agenda Fill out your Agenda. Science Starter: What is an element? What is a molecule? What is a compound?

  2. Table of contents update • Page 56 10/22 Matter Chart

  3. Mixtures • A mixture is a combination of two or more substances where there is no chemical combination or reaction.

  4. Mixtures combine physically in no specific proportions. They just mix.

  5. What is a solution? • A solution is a mixture of two or more substances. • At least two substances must be mixed, in order to have a solution

  6. Examples of solutions • Salt water • Clean Air • Vinegar

  7. A solution has two parts • The substance in the larger amount is called the SOLVENT - it does the dissolving • IN most common instances water is the solvent • The substance in the smallest amount and the one that DISSOLVES is called the SOLUTE

  8. Solutions • SOLUTIONS- are homogeneous mixtures

  9. Homogeneous mixtures • Evenly distributed particles • Particles NOT visible • The prefix: "homo"- indicates the same • Have the same uniform appearance and composition throughout • Examples: • AirSolutions (salt water) Alloys

  10. Heterogeneous mixtures • Visibly different parts • The prefix: "hetero"- indicates difference • Examples: Salt and pepper Rice Soup Pizza Sulfur and iron

  11. Suspensions • A SUSPENSION is a heterogeneous mixture of large particles • These particles are visible and will settle out on standing • Examples of suspensions are: fine sand or silt in water or Italian salad dressing

  12. Compounds vs Mixtures Mixtures Compounds • Not chemically combined • Combine chemically forming molecules • Can combine in any proportion • Combine in set proportions • Separated physically • Separated chemically

  13. 23 minute video clip on mixtures and solutions. • https://www.youtube.com/watch?v=pnpmPDa3tbM

  14. To do list . . . . . . • Practice worksheet which is two sided. • If you don’t finish it in class, they become homework.

  15. Link to the defined stem project of hand held devices. . . . • https://dlrn.us/mrilw

  16. Good Example of background research

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