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Name: 
 

Chap2practice


Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
Which is NOT an element?
a.
water
b.
oxygen
c.
carbon
d.
chlorine
e.
hydrogen
 

 2. 
The atom that represents the greatest weight in the human body is
a.
hydrogen.
b.
carbon.
c.
nitrogen.
d.
oxygen.
e.
phosphorus.
 

 3. 
The atomic number refers to the
a.
mass of an atom.
b.
number of protons in an atom.
c.
number of both protons and neutrons in an atom.
d.
number of neutrons in an atom.
e.
number of electrons in an atom.
 

 4. 
Radioactive isotopes
a.
are electrically unbalanced.
b.
behave the same chemically and physically but differ biologically from other isotopes.
c.
are the same physically and biologically but differ from other isotopes chemically.
d.
have an excess number of neutrons.
e.
are produced when substances are exposed to radiation.
 

 5. 
The negative subatomic particle is the
a.
neutron.
b.
proton.
c.
electron.
d.
both the neutron and proton.
e.
both the proton and electron.
 

 6. 
The positive subatomic particle is the
a.
neutron.
b.
proton.
c.
electron.
d.
both the neutron and proton.
e.
both the proton and electron.
 

 7. 
In the chemical shorthand 14C, the fourteen represents the number of
a.
excess neutrons.
b.
protons plus neutrons.
c.
electrons.
d.
protons plus electrons.
e.
radioactive particles.
 

 8. 
In a chemical equation, the chemicals to the left of the arrow are
a.
products.
b.
in greater abundance.
c.
at higher energy levels.
d.
reactants.
e.
all of these
 

 9. 
The bond in table salt (NaCl) is
a.
polar.
b.
ionic.
c.
covalent.
d.
double.
e.
nonpolar.
 

 10. 
Electrons are shared in bonds called
a.
covalent.
b.
polar.
c.
nonpolar.
d.
all of these
 

 11. 
Which of the following is NOT true of hydrogen bonds?
a.
They are quite weak.
b.
The hydrogen is slightly positive.
c.
They are common in macromolecules.
d.
They form in salts such as NaCl.
e.
They always involve hydrogen.
 

 12. 
Hydrophobic molecules are __________ water.
a.
attracted to
b.
absorbed by
c.
repelled by
d.
mixed with
e.
polarized by
 

 13. 
Which of the following is true of water?
a.
The oxygen end is slightly electropositive.
b.
Hydrogen bonds hold water molecules together.
c.
Water covers about one-half of the earth's surface.
d.
Hydrophobic interactions attract water molecules.
e.
Solvent properties are greatest with nonpolar molecules.
 

 14. 
Water is an excellent solvent because
a.
it forms spheres of hydration around charged substances and can form hydrogen bonds with many substances.
b.
it has a high heat-containing property.
c.
of its cohesive properties.
d.
it is a liquid at room temperature.
e.
all of these
 

 15. 
Glucose dissolves in water because it
a.
ionizes.
b.
is a polysaccharide.
c.
is polar and forms many hydrogen bonds with the water molecules.
d.
has a very reactive primary structure.
e.
none of these
 

 16. 
The column of water extending in tubes from plant roots to leaves is due mostly to
a.
cohesion.
b.
evaporation.
c.
ionization.
d.
hydrophobic interactions.
e.
all of these
 

 17. 
Which of the following is a naked proton?
a.
hydrogen ion
b.
acid
c.
base
d.
hydroxyl ion
e.
acceptor
 

 18. 
A pH of 10 is how many times as basic as a pH of 7?
a.
2
b.
3
c.
10
d.
100
e.
1,000
 

 19. 
A solution with a pH of 8 has how many times fewer hydrogen ions than a solution with a pH of 6?
a.
2
b.
4
c.
10
d.
100
e.
1,000
 

 20. 
Cellular pH is kept near a value of 7 because of
a.
salts.
b.
buffers.
c.
acids.
d.
bases.
e.
water.
 



 
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