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Chapter 5

Chapter 5 . KEY WORDS. Scientific model. A way of picturing processes that can’t be seen. Ex. particle theory. Heterogeneous. Not uniformly mixed particles. Salad, smarties , homogenized milk, metal ores smog. Homogeneous.

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Chapter 5

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  1. Chapter 5 KEY WORDS

  2. Scientific model A way of picturing processes that can’t be seen Ex. particle theory

  3. Heterogeneous Not uniformly mixed particles Salad, smarties, homogenized milk, metal ores smog

  4. Homogeneous Describes pure substances and mixtures that are uniform throughout Ex. Solutions, alloys , elements and compounds

  5. Solution • Homogeneous mixture of two or more pure substances ex. Solution = Salt water Solute = salt (the substance dissolved) Solvent= water (the substance in which the solute is dissolved)

  6. Mechanical mixture • Made of more than one kind of particle, not uniformly distributed Rice and beans, concrete (you can see the different parts)

  7. Density Mass per unit volume

  8. Combustibility Ability to burn in air ethanol

  9. Physical property • A characteristic that can be observed or measured

  10. Chemical property • How a substance reacts when forming a new substance

  11. Alloys • Homogeneous mixture of one or more metals Wood’s metal

  12. Suspension • Particles in mixture may be seen with naked eye or light microscope. Left undisturbed, particles separate.

  13. Colloid • A mechanical mixture with particles small enough they will not separate.

  14. Tyndall effect • The scattering of light by colloid particles

  15. Compounds and Elements Compounds: Atoms of different elements bonded together. Elements: Pure substances made of only one type of particle.

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