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BIOS 105 Exam 1
- What name is given to the bond between water molecules? polar covalent hydrogen ionic
hydrophobic single (nonpolar) covalent:
Answer Hydrogen
- Each water molecule is joined to other water molecules by
bonds.four ... hydrogen two ... hydrogen four ... polar covalent three ... ionic
two ... polar covalent:
Answer four...hydrogen
- The unequal sharing of electrons within a water molecule makes the water molecule .
have a low surface tension polar change easily from a liquid to gaseous form ionic hydrophobic: Answer Polar
- The tendency of an atom to pull electrons toward itself is referred to as its
.:
ionic potential polarity electronegativity tonicity
covalency:
Answer electronegativity
5. Why isn't this insect drowning?:
Answer The insect is very light.The insect is flying just above the water surface. Surface tension. 1 / 4
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The insect is swimming.It is difficult to change the temperature of water.Surface Tension
- A(n) refers to two or more atoms held together by covalent bonds.
Answer community molecule isotope shell
ion: molecule
- Which answer correctly ranks the atoms in terms of decreasing electroneg- ativity (the
highest electronegativity first)?Answer
N, O, C, H
O, N, C, H
N, O, H, C
O, N, H, C
C, H, O, N: O, N, C, H
- Dr. Haxton says the O-O bond is polar and the C-C bond is nonpolar. A good student would
say ...Answer Wrong again, Ralph. Both bonds are nonpolar. No way.C is more electronegative than O.Yes. O attracts electrons more strongly than C. No, both bonds are highly polar.Right! O is electronegative, so O2 is polar.: Wrong again, Ralph. Both bonds are nonpolar.
- Use your knowledge of electronegativity to pick out the most polar bond in the list below.
Answer O-C N-H O-H O-N
C-H: O-H 2 / 4
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10. If you want a molecule that is highly polar, look for one that contains:
Answer O-N C-S S-H C-H
H-N: H-N
- A phrase that applies to covalent bonding and not other kinds of bonds is
...:
Answer charge attraction.electron- sharing. great strength.paired electrons.
All of the above.: electron-sharing
- Which of the following statements most accurately describes the relative locations of the
covalently bonded electrons in methane (CH4) and ammonia (NH3)?Answer Electrons are shared equally in CH4 and unequally in NH3.Electrons are shared unequally in both molecules.Electrons are shared equally in both molecules.Electrons are shared equally in NH3 and unequally in CH4.: Electrons are shared equally in CH4 and unequally in NH3.
- A chemical bond that results from sharing electrons between two elements with very similar
electronegativity would best be termed .
Answer nonpolar covalent polar covalent ionic nonpolar 3 / 4
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ionic: nonpolar covalent
- Which statement best explains the physical basis for why oil and water don't mix?
Answer
Oils are positively charged molecules that are repelled by the partial positive charges on water molecules.Oils are negatively charged molecules that are repelled by the partial negative charges on water molecules.Oil molecules interact via hydrogen bonding more strongly with other oil molecules than with water molecules.Oils are nonpolar molecules that cannot interact with water molecules via hydrogen bonding.: Oils are nonpolar molecules that cannot interact with water molecules via hydrogen bonding.
15. Covalent bonds are due to the sharing of .:
Answer neutrons nuclei protons
electrons: electrons
- Which statement best explains the physical basis for why oil (molecules containing only
carbon and hydrogen) and water do not mix?
Answer Oils are negatively charged molecules that are repelled by the partial negative charges on water molecules.Oil molecules interact via hydrogen bonding more strongly with other oil molecules than with water molecules.Oils are nonpolar molecules that cannot interact with water molecules via hydrogen bonding.Oils are positively charged molecules that are repelled by the partial positive charges on water molecules.: Oils are nonpolar molecules that cannot interact with water molecules via hydrogen bonding.
17. Which kinds of bonds are present in a single water molecule?:
Answer ionic bonds nonpolar covalent bonds polar covalent bonds
hydrogen bonds: Polar covalent bonds
- Which functional group contains nitrogen?
Answer carboxyl sulfhydryl hydroxyl amino: amino
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