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Elements & Compounds

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 & Compounds

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  1. Elements & Compounds

  2. 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

  3. Examples Elements & Compounds

  4. 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

  5. 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.

  6. Compound • Example: Chalk and vinegar experiment. Elements & Compounds

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