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Chemistry mid-term

TermDefinition
intrinsic properties will not change even of the amount of the substance changes - freezing point
example of intrinsic properties the unknown powder was white
extrinsic properties will change if the amount of the substance changes- length, mass, volume
example of extrinsic of properties the mass of the unknown powder was 25g
what is an element made of only one type of atom
what is a compound two or more different atoms chemically combined
example of a compound salt - NaCl
what is a mixture combination of pure substances; physically separated back into their component parts
example of a mixture liquid in babies bottle (compound, element, mixture)
homogeneous mixture uniform throughout; if you take a sample away from the solution you will have the same mixture as the mixture you took it from
heterogeneous mixture are not uniform throughout; will never be equal amounts of the substance in mixture
example of homogeneous the liquid in babies bottle (homogeneous, heterogeneous)
example of heterogeneous italian dressing and oil + water
physical properties of a substance they are qualities that can be observed without changing the substance into something else - changes shape, size, and state
chemical properties of a substance allows it to change its molecular composition (change from one substance to another) - a formation of a new substance with new properties
example of chemical properties the unknown sold didn't react with vinegar
example of physical properties the unknown was solid
to separate oil and water density
separate sand and water filter
how to determine energy levels there are 7 energy levels and it goes by groups on the periodic table - group 6 = 6 energy levels
how to determine valence electrons what period it is in determines it - period 1 = 1 valence electron
how to determine oxidation numbers period 1 = 1+ etc.. once get to 4 go back down period 8 = 1-
how to determine atomic radius gets higher as you go down toward the bottom left corner
how to determine ionization energy and electronegativity increases as up go up toward the top right corner
traits of a covalent bond nonmetal+nonmetal, shared electrons, doesn't conduct electricity, low melting point, less then 1.7 electronegaivity,
traits of a ionic bond metal+nonmetal, greater than 1.7 electronegativity, doesn't conduct electricity as a solid, high melting point, brittle
trait of a metallic bond metal+metal, shared electrons, conducts electricity, high melting point, malleable, ductile
polar uneven; not equal (electronegitivity between 0.3- 1,7)
non-polar even on all sides (electronegativity less than 0.3)
metallic bond all positive ions and closely packed
ionic bond crystal lattice
covalent bond single connected
Created by: Megan16M
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