Chapter 6
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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.


Classifying matter

Classifying Matter


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,


Pure substance or mixture

Pure Substance or Mixture?

1. 2.


Pure substance or mixture1

Pure Substance or Mixture?

3. 4.


Pure substance or mixture2

Pure Substance or Mixture?

5.

6.


Pure substance or mixture3

Pure Substance or Mixture?

7. 8.


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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