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Biology II Ch. 2 Mastery Learning Test in Worksheets

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

 1. 
An element has an atomic number of 11 and an atomic number weight of 23. The number of neutrons in each atom is
a.
11
c.
23
b.
12
d.
24
 

 2. 
The atom of an alement has one proton and two neutrons. Its atomic number is
a.
1
c.
3
b.
2
d.
6
 

 3. 
The atom of an element has 6 protons and eight neutrons. The number of electrons in this atom if neutral is
a.
6
c.
12
b.
8
d.
14
 

 4. 
The relationship between 12/6 C and 14/6 C is that they are
a.
molecules
c.
isotopes
b.
isomers
d.
polymers
 

 5. 
An atom has 11 electrons and 12 neutrons. Its atomic weight is
a.
1
c.
12
b.
11
d.
23
 

 6. 
The energy possessed by electrons in the K shell is _________________ than the energy possessed by electrons in the L shell.
a.
greater
b.
less
 

 7. 
An element has an atomic number of 14. Its electron distribution over several shells is
a.
1-4-8
c.
2-8-2
b.
1-8-5
d.
2-8-4
 

 8. 
An element has an atomic number of 13. The number of electrons in each atom’s L energy shell is
a.
one
c.
four
b.
two
d.
eight
 

 9. 
Select the reactive element by its atomic number.
a.
2
c.
12
b.
10
d.
18
 

 10. 
Select the most stable element by its atomic number.
a.
1
c.
10
b.
8
d.
16
 

 11. 
Select the compound.
a.
Ca
c.
NaCl
b.
H
d.
O2
 

 12. 
The atoms of which element tend to lose electrons in a chemical reaction?
a.
Cl
c.
O
b.
Mg
d.
S
 

 13. 
In a chemical reaction between calcium and chlorine atoms, chlorine atoms tend to be
a.
oxidized
b.
reduced
 

 14. 
Select the incorrect association.
a.
covalent bond - electrons transferred
b.
hydrogen bond - between water molecules
c.
ionic bond - charged particles formed
d.
polar covalent bond - present in the water molecule
 

 15. 
The atoms of which element tend to be reduced in a chemical reaction?
a.
Ca
c.
K
b.
Cl
d.
Mg
 

 16. 
Each is a property of water EXCEPT
a.
easily changed from liquid to gas
c.
maximum density at 4 degrees celsius
b.
good solvent
d.
molecules are cohesive
 

 17. 
Select the correct statement about acids
a.
They cannot be buffered in a solution.
c.
HCl is an example.
b.
They donate hydroxide ions in solution.
d.
They tend to raise the pH.
 

 18. 
Select the most basic pH of the given hydrogen ion concentrations.
a.
1 x 10-3
c.
1 x 10-9
b.
1 x 10-4
d.
1 x 10-12
 

 19. 
Select the incorrect statement about bases.
a.
They can be buffered in a solution.
c.
NaOH is an example.
b.
They furnish hydroxide ions in solution.
d.
They tend to lower the pH.
 

 20. 
Which of the following is an example of a buffer?
a.
carbonic acid
c.
hydroxide ion
b.
hydrogen ions
d.
NaCl
 

Short Answer
 

 21. 
Element X has an atomic number of 4, whereas element Y has an atomic number of 18. Which element is more reactive, and why?
 

 22. 
Chemical reactions in the human body produce many acid end products. Yet, the pH of the blood remains remarkably constant. Why?
 



 
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