WorksheetsProperties of Water
Total questions: 10
Worksheet time: 5mins
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
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 van der waals interaction
The partial negative charge in a molecule of water occurs because
the oxygen atom acquires an additional electron
the electrons shared between the oxygen and hydrogen atoms spend more time around the oxygen atom nucleus than around the hydrogen atom nucleus
the oxygen atom has two pairs of electrons in its valence shell that are not neutralized by hydrogen atoms
the oxygen atom forms hybrid orbitals that distribute electrons unequally around the oxygen nucleus
one of the hydrogen atoms donates an electron to the oxygen atom
Water molecules are able to form hydrogen bonds with
compounds that have polar covalent bonds
oils
oxygen gas (O2 molecules)
Chloride ions
any compound that is not soluble in water
Which type of bond must be broken for water to vaporize?
ionic bonds
both hydrogen bonds and ionic bonds
polar covalent bonds
hydrogen bonds
both polar covalent bonds and hydrogen bonds
Why does evaporation of water from a surface cause cooling of the surface?
The breaking of bonds between water molecules absorbs heat
The water molecules with the most heat energy evaporate more readily
The solute molecules left behind absorb heat
Water molecules absorb heat from the surface in order to acquire enough energy to evaporate
The expansion of water vapor extracts heat from the surface
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
Water flows upward from the roots to the leaves in plants
Organisms resist temperature changes, although they give off heat due to chemical reactions
Evaporation of sweat from the skin helps to keep people from overheating
Why does ice float in liquid water?
The high surface tension of liquid water keeps the ice on top
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 the liquid water
The crystalline lattice of ice causes it to be denser than liquid water
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
polar substances that have an affinity for water
charged molecules that hydrogen-bond with water molecules
Based on your knowledge of the polarity of water molecules, the solute molecule depicted here is most likely
positively charged
negatively charged
without charge
hydrophobic
nonpolar
