Name: 
 

Ch 2 - Quiz 1.1  Chemistry of Life



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

 1. 

The three particles that make up atoms are
a.
protons, neutrons, and isotopes.
c.
positives, negatives, and electrons.
b.
neutrons, isotopes, and electrons.
d.
protons, neutrons, and electrons.
 

 2. 

If a chlorine atom had 17 protons and 18 neutrons, it would be called
a.
chlorine-17.
c.
chlorine-35.
b.
chlorine-18.
d.
chlorine-1.
 

 3. 

Which of the following terms describes a substance formed by the combination of two or more elements in definite proportions?
a.
compound
c.
nucleus
b.
isotope
d.
enzyme
 

 4. 

A covalent bond is formed as the result of
a.
transferring electrons.
c.
transferring protons.
b.
sharing an electron pair.
d.
sharing a proton pair.
 

 5. 

Ice floats on water because
a.
of cohesion.
c.
water shrinks when it freezes.
b.
ice has a higher density than water.
d.
water expands when it freezes.
 

 6. 

A solution is a(an)
a.
combination of isotopes. 
b.
chemical reaction.
c.
evenly distributed mixture of two or more substances.
d.
combination of two or more liquids.
 

 7. 

If the pH of stomach acid and of oven cleaner were measured,
a.
both would be below 7.
b.
both would be above 7.
c.
the pH of stomach acid would be above 7, but the pH of oven cleaner would be below 7.
d.
the pH of stomach acid would be below 7, but the pH of oven cleaner would be above 7.
 

 8. 

Amino acid is to protein as
a.
fat is to lipid.
c.
sugar is to fat.
b.
DNA is to RNA.
d.
simple sugar is to starch.
 

 9. 

Which statement is true?
a.
Simple sugars are made of polysaccharides.
b.
Glycerol is made of fatty acids.
c.
RNA molecules are made of nucleotides.
d.
Amino acids are made of proteins.
 

 10. 

What is the process that changes one set of chemicals into another set of chemicals?
a.
cohesion
c.
chemical reaction
b.
adhesion
d.
dissolving
 

 11. 

Which of the following is a form of energy that may be released during a chemical reaction?
a.
heat
c.
light
b.
sound
d.
all of the above
 

 12. 

Enzymes affect the reactions in living cells by changing the
a.
products of the reaction.
c.
temperature of the reaction.
b.
speed of the reaction.
d.
pH of the reaction.
 

Modified True/False
Indicate whether the statement is true or false.  If false, change the identified word or phrase to make the statement true.
 

 13. 

The isotope oxygen-18 has 18 protons. _________________________

 

 14. 

When sugar is dissolved in water, the sugar and water are chemically combined. _________________________

 

 15. 

Lipids are important parts of biological membranes and waterproof coverings. _________________________

 

 16. 

Proteins that speed up the rate of chemical reactions in the cell without requiring high temperatures are antibodies. _________________________

 

Completion
Complete each statement.
 

 17. 

Of the three subatomic particles, ___________ are most involved in forming chemical bonds.
 

 

 18. 

A chemical bond formed by the transfer of electrons is a(an) ____________________ bond.
 

 

 19. 

The pH scale is a measurement system that indicates the concentration of ____________________ in solution.
 

 

 20. 

The name of an enzyme usually ends in ____________________.
 

 

Short Answer
 

 21. 

What is mass number?
 

 22. 

What accounts for water’s properties of adhesion and cohesion?
 

 23. 

When H2 gas and O2 gas react to form water, what happens to the atoms that were in the gases, and what kind of bonds result?
 

 24. 

Where does the energy that enables you to breathe and think come from?
 

Other
 
 
USING SCIENCE SKILLS

ElementSymbolProtonsNeutronsElectrons
Atomic Number
Mass Number
Hydrogen
H
1
  
1
 
Helium
He
2
   
4
Carbon
C
 
6
 
6
 
Oxygen
O
 
8
  8
  
Neon
Ne
  
10
10
20
Aluminum
Al
13
   
27
Zinc
Zn
  
30
30
65

Figure 2–1
 

 25. 

Applying Concepts Based on Figure 2–1, what is the atomic number of oxygen?
 
 
USING SCIENCE SKILLS

pH Values of Some Common Substances
SubstancepH
Hydrochloric acid
1.0
Sulfuric acid
1.2
Tomatoes
4.2
Rainwater
6.2
Pure water
7.0
Sea water
8.5
Ammonium chloride
11.1
Sodium hydroxide
13.0

Figure 2–2
 

 26. 

Applying Concepts What is the strongest acid listed in Figure 2–2?
 

 27. 

Calculating A change of one unit on the pH scale represents a tenfold increase in the concentration of hydrogen ions. According to the pH values listed in Figure 2–2, how much greater is the H+ ion concentration in tomatoes than in rainwater?
 
 
USING SCIENCE SKILLS

nar003-1.jpg

Figure 2–3
 

 28. 

Applying Concepts Based on Figure 2–3, which enzyme would have the most activity in humans?
 

Essay
 

 29. 

Explain the difference between ionic compounds and covalently bonded compounds.
 

 30. 

How is chemistry related to living things?
 



 
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