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30 questions
What two elements make up water?
Helium and oxygen
Hydrogen and oxygen
helium and carbon
A water strider can skate along the top of a pond because:
covalent bonds result in water cohesion
hydrogen bonds result in water cohesion (surface tension)
water striders have adapted to take advantage of water cohesion
What word describes when water is attracted to other substances?
adhesion
cohesion
surface tension
Why can water have no net charge but have slight charges in different parts of the molecule?
The oxygen end is slightly negative and the hydrogen end is slightly positive
The hydrogen end is slightly negative and the oxygen end is slightly positive
The hydrogen and oxygen ends change in polarity
The weak attractions between water molecules are called
Covalent bonds
Ionic bonds
Hydrogen bonds
Water’s attraction to other water molecules
adhesion
capillary action
cohesion
Which is NOT a unique property of water?
Frozen water floats on liquid water.
Water covers most of the Earth’s surface and retains a large amount of heat.
Water cools very rapidly.
Water is polar because...
The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.
The molecule has two poles, at which the it is colder than other regions of the molecule.
The unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.
Tendency of molecules of the same kind to stick to one another
cohesion
adhesion
solution
Molecule in which opposite ends have opposite electric charges
cohesion
polar molecule
hydrogen bond
Why does ice float?
As water freezes, it expands and its density decreases.
As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.
Molecules with unevenly distributed electrically charged areas are called _______________.
magnets
polar molecules
solutions
Which end of the water molecule has a slightly positive charge?
the oxygen end
the hydrogen end
both ends are slightly positive
Which of the following is LEAST likely to dissolve in water?
nonpolar fats and oils
polar sugar molecules
salt made of a positive sodium ion and a negative chloride ion
Which characteristic of water will allow a paperclip to remain floating on water when the paperclip is gently placed on top of the water?
adhesion
surface tension
nonpolar
Which part(s) of a water molecule has/have a partial negative charge?
the two hydrogen (H) atoms
the two oxygen (O) atoms
the one oxygen (O) atom
Water droplets take a spherical shape (as pictured) because of ____________
adhesion
cohesion
capillary action
Which property of water will cause water to spread out on glass?
Adhesion
Cohesion
High specific heat
What property of water helps to moderate earth's temperature?
adhesion
chohesion
Specific heat capacity
Forms hydroxide ions (OH-) in water
Acids
Bases
both
pH less than 7
Acid
Base
Neutral
pH greater than 7
Acid
Base
Neutral
Corrosive
Acids
Bases
Both
The pH scale is based off of the concentration of _________ ions.
Oxygen
Hydrogen
Nitrogen
A sample of pure water is neutral because it contains
some H+ ions.
equal amounts of hydroxide and hydrogen ions.
some hydroxide ions.
_________________can resist the change of pH when you add acids or bases.
stronger acids
stronger bases
buffers
According to the chart, which is most acidic?
Tomoato
Soap
Lemon
According to the chart, which is the strongest base?
Bleach
Stomach Acid
Eggs
The production of acids and bases is related to the breakup of water molecules. This breaking of molecules can be called?
Association
Dissociation
Destruction
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