WorksheetsAP Biology Properties of Water
Total questions: 26
Worksheet time: 26mins
In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by
hydrogen bonds.
nonpolar covalent bonds
polar covalent bonds.
ionic bonds.
van der Waals interactions
The slight negative charge at one end of one water molecule is attracted to the slight positive charge of another water molecule. What is this attraction called?
a covalent bond
a hydrogen bond
an ionic bond
a hydrophilic bond
a hydrophobic bond
An example of a hydrogen bond is the bond between
C and H in methane (CH4).
the H of one water molecule and the O of another water molecule.
Na+and Cl- in salt.
the two hydrogen atoms in a molecule of hydrogen gas (H2).
Mg+and Cl- in MgCl2.
Water is able to form hydrogen bonds because
oxygen has a valence of 2.
the water molecule is shaped like a tetrahedron.
the bonds that hold together the atoms in a water molecule are polar covalent bonds.
the oxygen atom in a water molecule has a weak positive charge.
each of the hydrogen atoms in a water molecule is weakly negative in charge.
What gives rise to the cohesiveness of water molecules?
hydrophobic interactions
nonpolar covalent bonds
ionic bonds
hydrogen bonds
both A and C
Which of the following effects is produced by the high surface tension of water?
Lakes don't freeze solid in winter, despite low temperatures.
A water strider can walk across the surface of a small pond.
Organisms resist temperature changes, although they give off heat due to chemical reactions.
Water can act as a solvent.
The pH of water remains exactly neutral
The bonds that are broken when water vaporizes are
ionic bonds.
hydrogen bonds between water molecules.
covalent bonds between atoms within water molecules.
polar covalent bonds.
nonpolar covalent bonds
Many mammals control their body temperature by sweating. Which property of water is most directly responsible for the ability of sweat to lower body temperature?
water's change in density when it condenses
water's ability to dissolve molecules in the air
the release of heat by the formation of hydrogen bonds
the absorption of heat by the breaking of hydrogen bonds
water's high surface tension
Buffers are substances that help resist shifts in pH by
releasing H+ in acidic solutions
donating H+ to a solution when they have been depleted.
releasing OH- in basic solutions.
accepting H+ when the are in excess.
Both B and D are correct
Which of the following statements is true about buffer solutions?
They maintain a constant pH when bases are added to them but not when acids are added to them.
They maintain a constant pH when acids are added to them but not when bases are added to them.
They maintain a constant pH of exactly 7 in all living cells and biological fluids
They maintain a relatively constant pH when either acids or bases are added to them.
They are found only in living systems and biological fluids.
Hydrophobic substances such as vegetable oil are
nonpolar substances that repel water molecules.
nonpolar substances that have an attraction for water molecules
polar substances that repel water molecules
ar substances that have an affinity for water.
charged molecules that hydrogen-bond with water molecules.
Why does ice float in liquid water?
The liquid water molecules have more kinetic energy and thus support the ice.
The ionic bonds between the molecules in ice prevent the ice from sinking.
Ice always has air bubbles that keep it afloat.
Hydrogen bonds stabilize and keep the molecules of ice farther apart than the water molecules of liquid water
The crystalline lattice of ice causes it to be denser than liquid water
Temperature usually increases when water condenses. Which behavior of water is most directly responsible for this phenomenon?
the change in density when it condenses to form a liquid or
reactions with other atmospheric compounds
the release of heat by the formation of hydrogen bonds
the release of heat by the breaking of hydrogen bonds
the high surface tension of water
Which type of bond must be broken for water to vaporize?
ionic bonds
nonpolar covalent bonds
polar covalent bonds
hydrogen bonds
covalent bonds
Water's high specific heat is mainly a consequence of the
small size of the water molecules.
high specific heat of oxygen and hydrogen atoms.
absorption and release of heat when hydrogen bonds break and form.
fact that water is a poor heat conductor.
inability of water to dissipate heat into dry air.
Four Properties of water that facilitate an environment for life are:
Differentiate between cohesion, adhesion, and surface tension.
What is the difference between hydrophobic and hydrophilic?
The warming of the earth is called the (a) effect.
(a) refers to rain, snow, o fog with a pH lower than 5.6
A(n) (a) is any substance that increases the Hydrogen ion concentration of a solution.
A (a) is any substance that reduces the Hydrogen ion concentration of a olution.
A (a) is a liquid that is a homogeneous mixture of substances.
A (a) is the dissolving agent of a solution
The (a) is the substance that is dissolved.
(a) is the biological medium of Earth.
