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Chemistry –Pure substances

Chemistry –Pure substances. Grade 9. Elements. Made up of ONE TYPE of particle. Periodic Table. All elements are found arranged on the Periodic Table. There are between 88 - 92 naturally occurring elements. Classification of the Elements. Three M ajor Groups. Metals. Non-Metals.

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Chemistry –Pure substances

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  1. Chemistry –Pure substances Grade 9

  2. Elements Made up of ONE TYPE of particle.

  3. Periodic Table All elements are found arranged on the Periodic Table. There are between 88 - 92 naturally occurring elements.

  4. Classification of the Elements Three Major Groups Metals Non-Metals Metalloids What do you notice? Most of the elements are metals and are found on the left side of the periodic table

  5. Properties of metals Are all Solids at room temperature except Mercury which is a liquid.

  6. Properties of Non Metals Most are either gases or solids. One exception is Bromine which is a liquid.

  7. Properties of the Metalloids Metalloids have properties in-between metals and non-metals. They Sit on what looks like a “staircase” on the periodic table.

  8. Compounds Are Pure Substances made up of two or more different types of particles in a definite ratio Example Water is made of the elements Hydrogen and Oxygen combined together in the ratio of 1 part Oxygen, 2 parts Hydrogen. Compounds are represented by a formula such as H2O.

  9. This diagram represent the compound Copper carbonate. Copper carbonate is made up of 4 different elements Copper – 1 atom Carbon - 1 atom Oxygen - 3 atoms The formula is written CuCO3

  10. Copper sulfate = 1 atom of copper 1 atom sulfur 4 atoms of oxygen Formula = Cu SO4 O Cu O S O O

  11. What does this mean? Symbol for the element Oxygen. Symbol for the element Hydrogen H2 O The small number here means there are 2 atoms of Hydrogen No small number here means there 1 atom of Oxygen

  12. Rules • Metal goes first in the compound if it is present. • Hydrogen goes first if there is no metal • CuSO4 • H2O

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