Exam Two Flashcards

1
Q

electronegativity

A

caused by an unequal sharing of electrons

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2
Q

hydrogen bonds

A

form when a hydrogen atom covalently bonded to one electronegative atom is also attracted to another electronegative atom

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3
Q

heat

A

a measure of the total amount of kinetic energy due to molecular energy

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4
Q

transfer of heat

A

normally occurs from a high temp. object to a low temp. object

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5
Q

kinetic energy

A

the energy of motion

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6
Q

specific heat

A

amount of heat that must be absorbed or lost for 1g of that substance to change its temp. by 1 degree celsius

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7
Q

heat of vaporization

A

amount of heat that must be absorbed for 1g of that substance to be converted to gas

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8
Q

cohesion

A

hydrogen bonds hold water together

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9
Q

adhesion

A

attraction between different substances

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10
Q

surface tension

A

a measure of how hard it is to break the surface of a liquid

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11
Q

solvent

A

the dissolving agent of a solution

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12
Q

solute

A

the substance that is dissolved

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13
Q

solution

A

a liquid that is a homogeneous mixture of substances

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14
Q

aqueous solution

A

one in which water is the solvent

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15
Q

hydration shell

A

when an ionic compound is dissolved in water, each ion is surrounded by a sphere of water molecules

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16
Q

acidic

A

high H+ concentration (0-7)

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17
Q

basic

A

low H+ concentration (7-14)

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18
Q

evaporation

A

liquid to gas

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19
Q

transpiration

A

when water molecules evaporate off of plants

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20
Q

evapotranspiration

A

evaporation + transpiration

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21
Q

condensation

A

gas to liquid

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22
Q

precipitation

A

discharge of water in either liquid or solid state

23
Q

groundwater

A

water that fills empty spaces and cracks in the soil

24
Q

aquifer

A

underground soil or rock through which water easily moves

25
Q

porosity

A

amount of spaces in an aquifer

26
Q

permeability

A

a measure of how well spaces are connected

27
Q

water table

A

top of the water in soil

28
Q

recharge

A

water that enters/adds to ground water (rain)

29
Q

discharge

A

water leaving an aquifer (wells, lakes, rivers)

30
Q

coagulation

A

after screening out large objects from the water, coagulant chemicals are added to cause suspended particles to clump together

31
Q

sedimentation

A

water moves into quiet sedimentation basins where sediments settle out

32
Q

filtration

A

water is filtered through sand, membranes, or other materials

33
Q

disinfection

A

chemical additives, ozone, or UV light are used for disinfection in order to eliminate specific contaminants to prevent corrosion of the distribution system or to prevent tooth decay

34
Q

subsidence

A

lowering of ground surface due to lack of groundwater

35
Q

discharge (Q)

A

the volume of water passing a location along a stream over some time interval

36
Q

baseflow

A

groundwater input

37
Q

storm runoff

A

increases to discharge above baseflow

38
Q

the rising limb

A

the increase in discharge

39
Q

the peak

A

maximum discharge following a rain event

40
Q

magnitude of the peak

A

affected by the severity of the storm and the pathways of water to the stream

41
Q

the recession limb

A

the return to baseflow conditions

42
Q

lag to peak (lag time)

A

time between peak rainfall and peak discharge

43
Q

isotopes

A

two atoms of an element that differ in number of neutrons but have the same number of protons

44
Q

groups

A

elements in a vertical column that have the same number of electrons in their valence shell and thus have similar properties

45
Q

periods

A

each horizontal row contains elements with the same number of electron shells, ordered by increasing atomic number

46
Q

covalent bond

A

the sharing of a pair of valence electrons by two atoms, the shared electrons count as part of each atom’s valence shell

47
Q

single covalent bond

A

sharing of one pair of valence electrons

48
Q

double covalent bond

A

sharing of two pairs of valence electrons

49
Q

electronegativity

A

an atom’s attraction for the electrons in a covalent bond

50
Q

nonpolar covalent bond

A

the atoms share the electron equally

51
Q

polar covalent bond

A

one atom is more electronegative, and the atoms do not share the electron equally

52
Q

ionic bond

A

atoms sometimes strip electrons from their bonding partners, both atoms have charges

53
Q

ionization energy

A

amount of energy required to remove an electron from an atom

54
Q

electron affinity

A

amount of energy released when an electron is added to form a negative ion