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Quiz: 1. Define the following terms conductor of heat: Insulator of heat: Expansion:

Quiz: 1. Define the following terms conductor of heat: Insulator of heat: Expansion: Contraction: 2. What do particles do when they are heated? And why does it happen?. Substances, Compounds & Mixtures. How everything is put together. Substances.

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Quiz: 1. Define the following terms conductor of heat: Insulator of heat: Expansion:

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  1. Quiz: 1. Define the following terms conductorof heat: Insulator of heat: Expansion: Contraction: 2. What do particles do when they are heated? And why does it happen?

  2. Substances, Compounds & Mixtures How everything is put together.

  3. Substances • Matter that has the same composition and properties throughout is called a substance. • When different elements combine, other substances are formed.

  4. Substances • Contains only one particle • Can exist in 3 states of matter • Can be elements or compounds Picture from http://www.ilpi.com/msds/ref/gifs/statesofmatter.gif

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

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

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

  8. Solids, liquids and gases can be combined to create a mixture.

  9. Compounds • A compound is a substance composed of two or more different elements joined by chemical bonds • Compounds often have properties that are different from the elements that make them up. • Examples: Water, salt, sugar

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

  11. Can you identify the following? You will be shown a series of photos. Tell if each photo represents an item composed of an element, compound, or mixture. Review: • An element contains just one type of atom. • A compound contains two or more different atoms joined together. • A mixture contains two or more different substances that are only physically joined together, not chemically. • A mixture can contain both elements and compounds.

  12. Element, Compound, or Mixture? Rocks

  13. Element, Compound, or Mixture? Rocks

  14. Element, Compound, or Mixture? Copper

  15. Element, Compound, or Mixture? Copper Cu

  16. Element, Compound, or Mixture? Jelly Beans

  17. Element, Compound, or Mixture? Jelly Beans

  18. Element, Compound, or Mixture? Table Sugar

  19. Element, Compound, or Mixture? Table Sugar C12H22O11

  20. Element, Compound, or Mixture? Diamond

  21. Element, Compound, or Mixture? Diamond C

  22. Element, Compound, or Mixture? Tea

  23. Element, Compound, or Mixture? Tea

  24. Element, Compound, or Mixture? Salt

  25. Element, Compound, or Mixture? NaCl Salt

  26. Element, Compound, or Mixture? Neon Gas

  27. Element, Compound, or Mixture? Ne Neon Gas

  28. Element, Compound, or Mixture? Salad

  29. Element, Compound, or Mixture? Salad

  30. Element, Compound, or Mixture? Pure Water

  31. Element, Compound, or Mixture? Pure Water H2O

  32. Element, Compound, or Mixture? Aluminum

  33. Element, Compound, or Mixture? Aluminum Al

  34. Element, Compound, or Mixture? Lemonade

  35. Element, Compound, or Mixture? Lemonade

  36. Element, Compound, or Mixture? Silver

  37. Element, Compound, or Mixture? Silver Ag

  38. Element, Compound, or Mixture? Sand

  39. Element, Compound, or Mixture? Sand

  40. Notes -Matter that has the same composition and properties throughout is called a substance. -A mixture is a combination of two or more substances where there is no chemical combination or reaction. -A compound is a substance composed of two or more different elements joined by chemical bonds. Compounds often have properties that are different from the elements that make them up. -Mixture is separated physically and compounds are separated chemically.

  41. 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

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

  43. 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

  44. Pure Substances • A sample of matter that has definite chemical and physical properties. Atoms Elements Compounds Molecules

  45. Elements • pure substance that cannot be separated into simpler substance by physical or chemical means.

  46. Compounds Substances composed of two or more different elements joined by chemical bonds. • Made of elements in a specific ratio that is always the same • Has a chemical formula • Can only be separated by chemical means, not physically H2O NaCl CO2

  47. Mixtures • A combination of two or more pure substances that are not chemically combined. • substances held together by physical forces, not chemical • No chemical change takes place • Each item retains its properties in the mixture • They can be separated physically Chem4kids.com

  48. Mixtures vs. Compounds http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/elements_com_mix_6.shtml

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