chapter 5
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Chapter 5
KEY WORDS
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Scientific modelA way of picturing processes that can’t be seen
Ex. particle theory
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Heterogeneous
Not uniformly mixed particles
Salad, smarties, homogenized milk, metal ores smog
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Homogeneous
Describes pure substances and mixtures that are uniform throughout
Ex. Solutions, alloys , elements and compounds
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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)
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Mechanical mixture
• Made of more than one kind of particle, not uniformly distributed
Rice and beans, concrete (you can see the different parts)
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DensityMass per unit volume
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Combustibility
Ability to burn in air
ethanol
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Physical property
• A characteristic that can be observed or measured
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Chemical property
• How a substance reacts when forming a new substance
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Alloys
• Homogeneous mixture of one or more metals
Wood’s metal
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Suspension
• Particles in mixture may be seen with naked eye or light microscope. Left undisturbed, particles separate.
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Colloid
• A mechanical mixture with particles small enough they will not separate.
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Tyndall effect
• The scattering of light by colloid particles
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Compounds and Elements
Compounds: Atoms of different elements bonded together.Elements: Pure substances made of only one type of particle.