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Chapter 6. Chemistry. Chemistry . What is chemistry ? The study of matter. Questions that chemistry is trying to answer: What is matter made of? How does matter behave? How is matter combined or taken apart?. Chemistry. What is matter?

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chemistry
Chemistry
  • What is chemistry?
    • The study of matter.
    • Questions that chemistry is trying to answer:
      • What is matter made of?
      • How does matter behave?
      • How is matter combined or taken apart?
chemistry1
Chemistry
  • What is matter?
    • Any substance that has mass and volume (takes up space)
    • Matter is the “stuff” that makes up the universe.
    • Matter always has certain properties (characteristics or features).
      • There are two types of properties…
chemistry2
Chemistry
  • Physical properties:
    • Any feature that can be directly observed without changing the chemical structure:
      • Colour
      • Texture
      • Smell
      • Density
      • Conductivity
      • Solubility
chemistry3
Chemistry
  • Chemical properties:
    • Properties that describe how it will react when combined with another substance to form a new substance with new properties.
pure substances
Pure Substances
  • Elements:
    • Pure substance made of only 1 kind of atom
    • Has its own unique atom
    • Cannot be broken down into simpler substances
    • Always has a name in English or Latin
    • Always has a symbol
      • i.e. K – Potassium, Na – Sodium, Hg - Mercury
pure substances1
Pure Substances
  • Compounds:
    • Pure substance made of 2 or more elements bonded together in a fixed proportion!
    • Smallest part is a molecule
    • Can be broken down with energy
    • Always has a formula
      • i.e. CuCl2, H2O2, H2CO3
mixtures
Mixtures
  • Solutions:
    • Mixture in which one part has dissolved and spread out evenly in another part
    • Always homogenous
    • i.e. salt water, coffee, CuCl2 (aqueous)
mixtures1
Mixtures
  • Mechanical Mixtures:
    • Mixture in which one part is mixed with another part, but each part retains its own identity
    • Easily separable
    • i.e. iron filings and sulfur, raisin bran
mixtures2
Mixtures
  • Suspensions and Colloids:
    • A suspension is a mixture in which one part rises to the top while the other sinks to the bottom (heterogeneous). i.e. orange juice, salad dressing.
    • A colloid is a mixture in which the parts never settle out (a stable suspension). i.e. homogenized milk, mayonnaise,
assignment
Assignment
  • C.Y.U. 6.1 on page 152 in your textbook.
    • # 1, 2, 3, 4, 5, 6, 9, 10
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