Qualitative descriptions or distinctions are based on some quality or characteristic rather than on some quantity or measured value Qualitative Vs Quantitative Quantitative deals with quantities or information dealing with measureable data or actual numbers ID: 492011
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Qualitative Vs. Quantitative
Qualitative descriptions or distinctions are based on some quality or characteristic rather than on some quantity or measured value.Slide2
Qualitative Vs. Quantitative
Quantitative deals with quantities, or information dealing with measureable data, or actual numbers.Slide3
Qualitative Vs. Quantitative.
A qualitative description of a home decor project could be "painted the walls a soft beige, added drapes of smooth silk, placed vases of sweet smelling lilies throughout the room and added thick area rugs to muffle the outside sounds.“ Words like: Dull, shaggy, earth tonesThe quantitative description of the same home decor project could be "painted two walls in each room, added 120" drapes, cut 12 dozen lilies and placed them in vases throughout the room and added 1" thick area rugs to muffle the 84 decibel level from the trucks going by outside to a level of 10 decibels.“ Words like: Grams, liters, inches, milesSlide4
FiltrationSlide5
DistillationSlide6
Review
States of Matter:Solids: Have a fixed shape and volume, particles can’t move closer together, and will turn into a liquid if heated (energy added).Liquid: Have a variable shape and fixed volume, particles can’t move closer together, and will turn into a solid if energy is taken away, or into a gas if energy is added.Gas: Have a variable shape and volume, particles can move closer together, and will turn into a liquid if energy is taken away.Slide7Slide8
Phase changesSlide9
Vocab
Matter: Matter is anything that has mass and takes up space. (Is light matter? What about heat? Do they have mass? Do they take up space?)Element: A substance that cannot be broken down into simpler substances by chemical means.Compound: A chemical composition of two or more different elements joined together in fixed proportions.Mixture: A mixture refers to the physical combination of two or more substances on which the identities of each are retained.Slide10
Element, Compound, or Mixture?Slide11
Physical and Chemical Properties
Two types: Chemical and Physical.Physical properties do not change the chemical composition!Physical = Color, Density, Hardness, Boiling/Freezing/Melting point, Smell.Chemical properties change the chemical composition!Chemical= Combustion or fire, Changes in pH, or Chemical reactions!Slide12
Physical Properties
Physical has Intensive and Extensive properties. = PIEIntensive: Do not depend on how much you have! (Color, Luster, Malleability, Conductivity, Melting/Boiling/Freezing Points)Extensive: Depend on how much you have! (Volume, Mass, Length, Width)Physical changes do not produce a new substance!Slide13
Chemical changes
Produce a new substance!1. One or more substances are used up.2. One or more new substances are formed.3. Energy is either absorbed or released.Slide14
Pure Substances
Pure substance: Have a fixed composition but differ from a mixture in the following ways.EVERY sample of the substance has exactly the same characteristic properties.EVERY sample of the substance has exactly the same composition.Pure substances are made up of only ONE element or ONE compound.Slide15
Mixtures
Mixture: Is a blend of two or more kinds of matter. Each type of matter retains its own identity and properties.Two types: Homogeneous and Heterogeneous.Heterogeneous: Not uniform throughout.Homogeneous: The same composition throughout. Also known as Solutions.Slide16
Density
Density = Mass / VolumeVolume = milliliters (ml), or cm3Mass = grams, (g)Slide17
Density ExampleD=M/V
Substance
DensityCopper
8.933 g/cm
3
Iron
7.874 g/cm
3
Gold
19.282 g/cm
3
I have a substance that has a mass of 5.955 grams, and a volume of 1.5 cubic centimeters. What kind of substance do I have?