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30 Cards in this Set

  • Front
  • Back
the number of protons in an uncharged atom_
equals the number of electrons.
two atoms of the same element must have the same number of_
isotopes of an element will always differ in_
atomic mass.
a covalent bond is likely to be polar if_
one of the atoms sharing electroms is much more electronegative.
hydrogen bonds occur when_
partial opposite charges on molecules come close enough to attract each other.
the number of bonds atoms can form depends on:
the number of valence electrons.
an element has 9 protons, 10 neutrons, and 9 electrons. its atomic number and atomic mass respectively, are_
9 and 19.
the chemical characteristics of an element depend mostly on the
number of electrons in its outer shell.
oxygen is much more electronegative than hydrogen. which of the following statements is correct about H2O?
each hydrogen atom has a partial positive charge.
which of the following statements describes a reversible reaction that has reached chemical equilibrium?
the rate of the reverse reaction equals the rate of the forward reaction.
in a group of water molecules, hydrogen bonds form between_
the oxygen atom and one water molecule and a hydrogen atom in another water molecule.
when two atoms are equally electronegative, they can interact to form
nonpolar covalent bonds.
because molecules of water are farther apart in ice than in liquid water,
ice floats.
water is a very versatile solvent because water molecules are
hydrophobic molecules are__water.
repelled by
an acid is
a compound that donates hydrogen ions to a solution.
a substance that minimizes changes in the concentration of H+ and OH- in a solution is a
what would be the pH of a solution with a hydroxide ion concentration (OH-)of 10^-8 M?
what do the following have in common with reference to water:cohesion, surface tension, specific heat?
all are properties related to hydrogen bonding.
a molecule that has all nonpolar covalent bonds would be_
the carbon atom is tetravalent; this means that
a carbon atom can complete its valence shell by forming four covalent bonds
which of these is found in all amino acids?
both -COOH and -NH2
which one of the following molecules has a carboxyl functional group?
which of the following functional groups is associated with a release of energy that cells can harves to perform many funtions?
which two functional groups are part of the monomers of polypeptides?
carboxyl and amine
a chemist wishes to make an organic molecule less acidic. which of the following functional groups should she add to the molecule?
what is the process by which cells link monomers together to form polymers?
dehydration/condensation synthesis
cellulose is a _ made of many _.
polymer... glucose molecules
in what polysaccharide form do plants store glucose to be available later as an energy source?
which one of the following components of a tossed salad will pass through the human digestive tract and be digested the least?
cellulose (in the lettuce)