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Introduction to Chemistry: Understanding Physical and Chemical Properties

Discover the basics of chemistry, including properties like color, texture, and reactivity. Learn about physical and chemical changes, reactions, and evidence of chemical transformations. Begin your journey into the world of substances and their transformations.

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Introduction to Chemistry: Understanding Physical and Chemical Properties

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  1. Introduction to Chemistry unit 1

  2. Chemistry is… • The study of the substances around us • Teaches us how to change substances into new ones • Teaches us how to do this in a socially and environmentally safe way

  3. Properties can be physical or chemical…

  4. Physical Properties • A description of a substance that does NOT involve forming a new substance • Examples: • Colour • Texture • Shape • Hardness • Viscosity • Odour • Melting point • Boiling Point • Lustre • Density • Transmission of Light • Clarity (transparent/opaque) • Taste • State (solid/liquid/gas)

  5. Chemical Properties • A description of what a substance does as it changes into one or more new substance(s) • Examples: • Corrosion • Reactivity • Combustibility: the ability of a substance to burn (requires oxygen) • Flammable: the ability of a substance to burn when exposed to a flame • Light Sensitivity: the ability of a substance to change to a new substance in the presence of visible light

  6. Sort: Liquid, 23oC, reactive, brittle, very soluble, 250mL, non-flammable, square, smooth, combustible, yellow, solid

  7. Sort:

  8. Physical Change • A change that does NOT produce a new substance • only a change of state • new substance has the same properties as the old one • Examples: • Change of state (ex. melting, evaporating, condensation, dissolving)

  9. Chemical Change • The change that a substance goes through to produce a NEW substance • Most cannot be reversed • New substance is different from the original – it has different properties

  10. Examples of chemical reactions • raw egg becomes cooked egg • cake mix becomes cake • paper becomes ash • steel becomes rust

  11. Chemical Change con’t • Evidence of a chemical change: 1. A new colour appears 2. A solid (precipitate forms) in a liquid 3. Heat or light is produced or absorbed 4. The change is (generally) difficult to reverse 5. Bubbles of gas are formed

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