1) In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by
A) hydrogen bonds.
B) nonpolar covalent bonds.
C) polar covalent bonds.
D) ionic bonds.
E) van der Waals interactions.
2) 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) a covalent bond
B) a hydrogen bond
C) an ionic bond
D) a hydrophilic bond
E) a hydrophobic bond
3) An example of a hydrogen bond is the bond between
A) C and H in methane (CH4).
B) the H of one water molecule and the O of another water molecule.
C) Na+and Cl- in salt.
D) the two hydrogen atoms in a molecule of hydrogen gas (H2).
E) Mg+and Cl- in MgCl2.
4) Water is able to form hydrogen bonds because
A) oxygen has a valence of 2.
B) the water molecule is shaped like a tetrahedron.
C) the bonds that hold together the atoms in a water molecule are polar covalent bonds.
D) the oxygen atom in a water molecule has a weak positive charge.
E) each of the hydrogen atoms in a water molecule is weakly negative in charge.
5) What gives rise to the cohesiveness of water molecules?
A) hydrophobic interactions
B) nonpolar covalent bonds
C) ionic bonds
D) hydrogen bonds
E) both A and C
6) Which of the following effects is produced by the high surface tension of water?
A) Lakes donʹt freeze solid in winter, despite low temperatures.
B) A water strider can walk across the surface of a small pond.
C) Organisms resist temperature changes, although they give off heat due to chemical reactions.
D) Water can act as a solvent.
E) The pH of water remains exactly neutral.
7) Which of the following takes place as an ice cube cools a drink?
A) Molecular collisions in the drink increase.
B) Kinetic energy in the drink decreases.
C) A calorie of heat energy is transferred from the ice to the water of the drink.
D) The specific heat of the water in the drink decreases.
E) Evaporation of the water in the drink increases.
8. Which of the following statements correctly defines a kilocalorie?
A) the amount of heat required to raise the temperature of 1 g of water by 1°F
B) the amount of heat required to raise the temperature of 1 g of water by 1°C
C) the amount of heat required to raise the temperature of 1 kg of water by 1°F
D) the amount of heat required to raise the temperature of 1 kg of water by 1°C
E) the amount of heat required to raise the temperature of 1,000 g of water by 1°F
9) The nutritional information on a cereal box shows that one serving of a dry cereal has 200 kilocalories. If one were to burn one serving of the cereal, the amount of heat given off would be sufficient to raise the temperature of 20 kg of water how many degrees Celsius?
10) Waterʹs high specific heat is mainly a consequence of the
A) small size of the water molecules.
B) high specific heat of oxygen and hydrogen atoms.
C) absorption and release of heat when hydrogen bonds break and form.
D) fact that water is a poor heat conductor.
E) inability of water to dissipate heat into dry air.