Review 1 Ch 2 & 3
2) atomic number.
4) 31 daltons
6) 19 daltons
8) number of neutrons
10) two more neutrons than hydrogen-1.
12) an electron may move
to an electron shell farther out from the nucleus.
14) electrons in the
outer valence shell in the atom.
16) 2
18) outer-shell electrons of two
atoms are shared so as to satisfactorily fill the outer electron shells of both
atoms.
20) 2
22)
Each hydrogen atom has a partial positive charge.
24) a
polar covalent bond
26) H2O
28) Covalent bonds involve the
sharing of electrons between atoms and ionic bonds involve the electrical
attraction between atoms
30 an ionic bond
32) electrons are not
symmetrically distributed in a molecule.
34) polar covalent bonds.
36) hydrogen bonds
38) A water strider can walk across the surface
of a small pond.
40) absorption and
release of heat when hydrogen bonds break and form.
42) high heat of vaporization of water.
44) the release of heat
by the formation of hydrogen bonds
46) hydrogen
48) nonpolar substances that repel
water molecules.
50) 60
52)
150
54) pH 2
56) gastric juice at pH 2
58) concentration of H+
has increased 10 times what it was at pH 9. And concentration of
60) 10,000 times more
62) the HCO3-
to act as a base and remove excess H+ with the formation of H2CO3.
64) cohesion
66) hydrogen ions is equal to the concentration of hydroxide
ions.
68) the body of higher temperature to the one of lower
temperature.
70) wax