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Chapter 2

Elements. Chapter 2. Atoms – the fundamental component of all matter Element – a substance containing only one kind of atom Pure substance – a material composed of only one type of element or compound. Compounds. Two or more elements can combine together to form compounds

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Chapter 2

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  1. Elements Chapter 2

  2. Atoms – the fundamental component of all matter • Element – a substance containing only one kind of atom • Pure substance – a material composed of only one type of element or compound

  3. Compounds • Two or more elements can combine together to form compounds • Compounds are pure even though they contain multiple elements

  4. Water contains hydrogen and oxygen • H2O • Sand is a compound made of silicon dioxide • SiO2

  5. For compounds the smallest unit of the compound is called a molecule. • Compounds have different properties than the original elements

  6. Impure mixtures • Many substances we commonly use are actually mixtures of multiple elements and compounds • Heterogeneous and homogeneous

  7. Heterogeneous mixtures • These mixtures are obvious since you can easily see differences

  8. Homogeneous • The mixture looks, tastes, feels, etc, the same throughout • Can you think of some examples?

  9. Homogeneous mixtures are also called solutions • Solid, liquid, and gas

  10. Mixtures (heterogeneous or homogeneous) can be separated, but elements and compounds can not.

  11. Changes in matter • Physical vs. Chemical • Physical properties are the set of properties that define the material • Mass • Color • Density

  12. Physical change • Commonly known as a phase change

  13. The chemical properties of a material determine its ability to interact with other materials (elements or compounds)

  14. Chemical changes • A chemical reaction is a change involving the chemical properties of two materials • Reactants Products

  15. Periodic table of elements • Now that you all know about compounds and mixtures we should look at what makes a compound

  16. Why the odd chemical symbol?

  17. Chemical formulas • This is the shorthand showing what elements make up a compound • Organic compounds- • Inorganic compounds-

  18. Chemical equations • The chemical change can be show with a chemical equation with the reactants and products displayed as chemical formulas

  19. Homework 1 is now available and will be due on January 31st by 11:45pm.

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