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Water and its Properties
vocab and main ideas- 15.1
26
Chemistry
11th Grade
04/22/2009

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Term
what shape does a water molecule have?
Definition
a simple triatomic
Term
what type of bond bonds the oxygen molecule of a water atom with the hydrogen atoms?
Definition
covalent bonds
Term
what is the bond angle of a simple triatomic structure?
Definition
105 degrees
Term
is a water molecule polar
Definition
very
Term
what charge does the oxygen atom have in a water molecule?
Definition
partially negative
Term
what charge does each of the hydrogen atoms in a water molecule have?
Definition
partially positive
Term
what is the attraction between polar molecules called?
Definition
dipole interactions
Term
what kind of dipole interactions occur in water?
Definition
hydrogen bonds
Term
what properties of water result from hydrogen bonding?
Definition
high surface tension, low vapor pressure
Term
an inward force that tends to minimize the surface area of a liquid; it causes the surface to behave as if it were a thin skin
Definition
surface tension
Term
what is the high surface tension of water caused by?
Definition
hydrogen bonds
Term
where are the molecules of water drawn, causing surface tension?
Definition
inward
Term
does water have a higher surface tension than most other liquids?
Definition
yes
Term
why aren't water droplets spherical?
Definition
gravity
Term
any substance that interferes with the hydrogen bonding between water molecules and thereby reduces surface tension; soaps are surfactants
Definition
surfactant
Term
what happens if you add soap to water?
Definition
the droplets will collapse and spread out
Term
the result of molecules escaping from the surface of the liquid and entering the vapor phase
Definition
vapor pressure
Term
what explains waters low vapor pressure?
Definition
hydrogen bonding makes it harder for molecules to escape
Term
is the density of the solid state of water higher or lower than the liquid state of water?
Definition
lower
Term
is the difference in the density of solid and liquid water states normal in liquids?
Definition
No
Term
when does the density of water start to act differently than other liquids, temperature wise?
Definition
under 4 degrees Celsius
Term
what is the structure of ice?
Definition
water molecules arranged in a honeycomb pattern
Term
what does the honeycomb structure of ice cause?
Definition
the low density of ice
Term
what temperature does ice melt (C)
Definition
0 C
Term
how many joules are needed to change 1 g of water from a solid to a liquid?
Definition
334 J
Term
amount of energy to raise the temperature of water from 0 C to 80 C
Definition
334 J
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