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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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Chapter 6

Chapter 6

Chemistry


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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