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Chemistry

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

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  1. Chapter 6 Chemistry

  2. 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?

  3. 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…

  4. Chemistry • Physical properties: • Any feature that can be directly observed without changing the chemical structure: • Colour • Texture • Smell • Density • Conductivity • Solubility

  5. Chemistry • Chemical properties: • Properties that describe how it will react when combined with another substance to form a new substance with new properties.

  6. Classifying Matter

  7. 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

  8. 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

  9. 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)

  10. 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

  11. 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,

  12. Pure Substance or Mixture? 1. 2.

  13. Pure Substance or Mixture? 3. 4.

  14. Pure Substance or Mixture? 5. 6.

  15. Pure Substance or Mixture? 7. 8.

  16. Assignment • C.Y.U. 6.1 on page 152 in your textbook. • # 1, 2, 3, 4, 5, 6, 9, 10

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