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Elements & Compounds. Pure Substances. Pure Substances. Elements & Compounds. Elements (O 2 , H 2 , C, Na Cl 2 ). Compounds (H 2 O, CO 2 , NaCl ). Pure Substances have distinct properties (freezing point test): – Melting point/Freezing point – Boiling point/Condensation point

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elements compounds1

Pure Substances

Pure Substances

Elements & Compounds

Elements

(O2, H2, C, Na Cl2)

Compounds

(H2O, CO2, NaCl)

  • Pure Substances have distinct properties (freezing point test):
  • – Melting point/Freezing point
  • – Boiling point/Condensation point
  • – Density
elements compounds3

Compound

  • Compounds can be broken down during chemical reactions.
  • You may observe the following:
  • – A gas being formed and escaping
  • ( original mass of compound decreases).
  • – Effervescence (bubbling).
  • – Color change in the original substance or both and color and state change in the original substance. (i.e. From solid to gas).

Elements & Compounds

elements compounds4

Compound

  • Example: Chalk and vinegar experiment.

Elements & Compounds

Chalk, a white powder

Chalk and powder are reactants.

+

Vinegar

Result (Bubbling, liquid grey

mush, & gass, CO2)

Products.

elements compounds5

Compound

  • Example: Chalk and vinegar experiment.

Elements & Compounds