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PROPERTIES OF PURE SUBSTANCES

PROPERTIES OF PURE SUBSTANCES. What is a pure substance? Non-characteristic properties Characteristic properties (physical and chemical) Determining an unknown substance. What is a Pure Substance?. Substance made up of 1 type of atom OR 1 type of molecule Mixtures are NOT pure substance

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PROPERTIES OF PURE SUBSTANCES

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  1. PROPERTIES OF PURE SUBSTANCES What is a pure substance? Non-characteristic properties Characteristic properties (physical and chemical) Determining an unknown substance

  2. What is a Pure Substance? • Substance made up of 1 type of atom OR 1 type of molecule • Mixtures are NOT pure substance • 2 types • Elements • 1 type of atom • Iron, oxygen, • Compounds • At least 2 types of atoms • Water, salt,

  3. Non-Characteristic Property • A property that is shared by many substances • It does not allow you to identify it • Examples: mass, volume, temperature, color, shape.

  4. Characteristic Property • A property that is unique to that one substance • Allows you to identify it right away • Examples: DNA, boiling point, density

  5. Physical Characteristic Properties • Once the observation of the property is made, the molecular make-up of the substance remains the same • Examples: melting point, boiling point, density, solubility • See Table 1.30 on page 23 of textbook

  6. Chemical Characteristic Properties • Once the action or observation is made, the substance is no longer the same, its molecular make-up has changed • Examples: burning, digesting, use of indicators • See Table 1.31 on page 24 of textbook

  7. Determining an Unknown Substance • There are many tests that can be done to identify a substance which include: • Conductivity: if light of conductivity meter comes on • Malleability: ability to bend • Magnetism: substance is attracted or repelled by a magnet • Smell • Colour • Metallic luster: shine, all metals shine • Density • See tables on pages 23 and 24 of textbook

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