1. Water is able to form hydrogen bonds because 1. oxygen has a valence of 2. 2. the water molecule is shaped like a tetrahedron. 3. the bonds that hold together the atoms in a water molecule are polar covalent bonds. 4. the oxygen atom in a water molecule has a weak positive charge. 5. each of the hydrogen atoms in a water molecule is weakly negative in charge. 25 oxygen hasa valence of2. the w aterm olecule issh... the bondsthathold tog... the oxygen atom in a w a... each ofthe hydrogen ato.. 0% 0% 0% 0% 0% 0%
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1. Water is able to form hydrogen bonds because 1.oxygen has a valence of 2. 2.the water molecule is shaped like a tetrahedron. 3.the bonds that hold together.
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1. Water is able to form hydrogen bonds because
oxyge
n has a valence
of 2.
the w
ater molecu
le is sh
...
the bonds t
hat hold to
g...
the oxyg
en atom in
a wa...
each of t
he hydro
gen ato..
0% 0% 0%0%0%0%
1. oxygen has a valence of 2. 2. the water molecule is shaped like
a tetrahedron. 3. the bonds that hold together the
atoms in a water molecule are polar covalent bonds.
4. the oxygen atom in a water molecule has a weak positive charge.
5. each of the hydrogen atoms in a water molecule is weakly negative in charge.
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2.What gives rise to the cohesiveness of water molecules?
hydro
phobic inte
ractions
nonpolar covalent b
onds
ionic bonds
hydro
gen bonds
both A
and C
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1. hydrophobic interactions
2. nonpolar covalent bonds
3. ionic bonds 4. hydrogen bonds 5. both A and C
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3.Which of the following statements is true about buffer
solutions ?
1 2 3 4 5
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1. They maintain a constant pH when bases are added to them but not when acids are added to them.
2. They maintain a constant pH when acids are added to them but not when bases are added to them.
3. They maintain a constant pH of exactly 7 in all living cells and biological fluids.
4. They maintain a relatively constant pH.
5. They are found only in living systems and biological fluids.
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Which molecule contains an amino functional group, but is not an amino acid?
A B C D E
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1. A2. B3. C4. D5. E
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5. Which of the following is false?
The higher t
he pH the m
...
pH affects th
e charge of..
.
A chan
ge in pH ca
n dena...
The pH scale
is lo
garit
hmic
1 and 4 are fa
lse
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1. The higher the pH the more H+ ions present
2. pH affects the charge of molecules
3. A change in pH can denature proteins
4. The pH scale is logarithmic5. 1 and 4 are false
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C=0Figure 4.4
6. What is the name of the functional group shown in Figure 4.4?