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CHEMICAL COMPOUNDS CHAPTER 3 TEST

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

1. 
Which of the following does NOT describe ionic compounds?
a.
high melting point
b.
brittle
c.
do not conduct electric currents in water
d.
dissolve easily in water
 

2. 
An increase in the amount of hydrogen ions in a solution ____ the pH.
a.
raises
c.
does not affect
b.
lowers
d.
doubles
 

3. 
Of the following, in equal concentrations, a ____ has the lowest pH.
a.
salt
c.
strong acid
b.
strong base
d.
None of the above
 

4. 
Which of the following is an inorganic compound?
a.
methane (CH4)
c.
methylamine (CH3NH2)
b.
water (H2O)
d.
acetic acid (CH3COOH)
 

5. 
What type of compound can be formed by the reaction of a metal with a nonmetal?
a.
nonmetallic compound
c.
metalloidal compound
b.
metallic compound
d.
ionic compound
 

6. 
A compound that shatters when hit with a hammer is most likely a(n)
a.
ionic compound.
c.
metallic compound.
b.
covalent compound.
d.
metalloidal compound.
 

7. 
Magnesium oxide melts at 2,800°C. What type of compound is magnesium oxide?
a.
ionic compound
c.
metallic compound
b.
covalent compound
d.
metalloidal compound
 

8. 
The ions that make up a crystal lattice are arranged as
a.
alternating positive and negative ions.
b.
positive ions surrounded by an electron cloud.
c.
electrons "swimming" about positive ions.
d.
negative ions surrounded by a positive ion cloud.
 

9. 
When an ionic compound is struck with a hammer, the pattern of ions in the crystal lattice is shifted, causing
a.
ions to bond with different ions.
b.
ions to become attracted to an oppositely charged ion.
c.
ions to repel one another.
d.
None of the above
 

10. 
Which type of compound can conduct an electric current when it is dissolved in water?
a.
covalent compound
c.
ionic compound
b.
organic compound
d.
metallic compound
 

11. 
Which type of compound is the most soluble in water?
a.
covalent compound
c.
metallic compound
b.
ionic compound
d.
metalloidal compound
 

12. 
____ compounds are composed of elements whose atoms share electrons.
a.
Metallic
c.
Ionic
b.
Coordinate
d.
Covalent
 

13. 
Carbon dioxide is a gas at room temperature. What type of compound is this most likely to be?
a.
a metallic compound
c.
a covalent compound
b.
an atomic compound
d.
an ionic compound
 

14. 
Why do covalent compounds have lower melting points than ionic compounds?
a.
There is no force of attraction between molecules of covalent compounds.
b.
The forces of attraction between molecules of covalent compounds are the same as the bonds between ions in a crystal lattice.
c.
The forces of attraction between molecules of covalent compounds are much stronger than the bonds between ions in a crystal lattice.
d.
The forces of attraction between molecules of covalent compounds are much weaker than the bonds between ions in a crystal lattice.
 

15. 
The ability to change the color of certain chemicals is one property used to classify substances as
a.
acids.
c.
salts.
b.
bases.
d.
Both (a) and (b)
 

16. 
What happens when an acid reacts with a base?
a.
An acid remains.
c.
A salt forms.
b.
The base precipitates.
d.
both (a) and (b)
 

17. 
____ is a compound that increases the number of hydrogen ions when dissolved in water.
a.
An acid
c.
A salt
b.
A base
d.
An ionic compound
 

18. 
Which of the following would taste sour?
a.
an acid
c.
a salt
b.
a base
d.
an ionic compound
 

19. 
When all the molecules of a compound break apart in water to produce hydrogen ions, the compound is considered to be a
a.
strong acid.
c.
strong base.
b.
weak acid.
d.
weak base.
 

20. 
When few molecules of a compound break apart in water to produce hydrogen ions, the compound is considered to be a
a.
weak base.
c.
strong base.
b.
weak acid.
d.
strong acid.
 

21. 
____ is a compound that increases the number of hydroxide ions when dissolved in water.
a.
An acid
c.
A salt
b.
A base
d.
A covalent compound
 

22. 
Which of the following would feel slippery?
a.
an acid
c.
a base
b.
a salt
d.
none of the above
 

23. 
When all the molecules of a compound break apart in water to produce hydroxide ions, the compound is considered to be a
a.
strong acid.
c.
strong base.
b.
weak acid.
d.
weak base.
 

24. 
When few molecules of a compound break apart in water to produce hydroxide ions, the compound is considered to be a
a.
strong acid.
c.
weak acid.
b.
strong base.
d.
weak base.
 

25. 
A solution that has a pH of ____ is neutral.
a.
0
c.
7
b.
1
d.
14
 

26. 
Human blood has a pH of between 7.38 and 7.42. This means that the blood is
a.
very acidic.
c.
very basic.
b.
slightly acidic.
d.
slightly basic.
 

27. 
Rainwater can have a pH as low as 3, meaning that it is very
a.
acidic.
c.
neutral.
b.
basic.
d.
salty.
 

28. 
Carbon atoms can form the backbone of organic compounds because each carbon atom
a.
has 4 valence electrons.
c.
can form 4 bonds.
b.
can bond with 4 atoms.
d.
All of the above
 

29. 
Carbohydrates are
a.
made of one or more simple sugars bonded together.
b.
used as a source of energy.
c.
used for energy storage.
d.
All of the above
 

30. 
Which of the following is used to store energy in the body?
a.
carbohydrates
c.
proteins
b.
lipids
d.
both (a) and (b)
 

31. 
Which of the following is used to make up much of the cell membrane?
a.
carbohydrates
c.
proteins
b.
lipids
d.
all of the above
 

32. 
A hydrocarbon in which each carbon atom in the molecule shares a single bond with each of four other atoms is a(n)
a.
saturated hydrocarbon.
c.
polyunsaturated hydrocarbon.
b.
unsaturated hydrocarbon.
d.
aromatic hydrocarbon.
 

33. 
A single bond consists of one pair of shared
a.
electrons.
c.
ions.
b.
protons.
d.
carbons.
 

Completion
Complete each sentence or statement.
 

34. 
Compounds that have low melting points and do not usually dissolve well in water are ____________________. (ionic compounds or covalent compounds)
 

 

35. 
A(n) ____________________ turns red litmus paper blue. (acid or base)
 

 

36. 
____________________ are composed of only carbon and hydrogen. (Ionic compounds or Hydrocarbons)
 

 

37. 
____________________ compounds are formed when electrons are shared between atoms of two different elements. (Covalent or Ionic)
 

 

38. 
Limewater with a pH of 10.5 is a(n) ____________________. (base or acid)
 

 

Short Answer
The first 2 questions you MUST answer. Any others answered will be considered for EXTRA CREDIT.
 

39. 
What products are formed when an acid and base react?
 

40. 
Would you expect the pH of a sample of acid rain to be 4 or 9? Why?
 

41. 
Would you expect the pH of a solution of soap to be 4 or 9?
 

42. 
What are the four categories of biochemicals?
 

43. 
Sickle-cell anemia is a condition that results from a change of one amino acid in the protein hemoglobin. Why is this condition a genetic disorder?
 

44. 
Compare saturated and unsaturated hydrocarbons.
 

45. 
What characteristic of carbon atoms helps to explain the wide variety of organic compounds?
 

46. 
Compare acids and bases based on the ion produced when each compound is dissolved in water.
 

47. 
Organic compounds are also covalent compounds. What properties would you expect organic compounds to have as a result?
 

48. 
A diet that includes a high level of lipids is unhealthy. Why is a diet containing no lipids also unhealthy?
 
 
Study the structural formulas below and answer the questions that follow.

matter_ch-3_files/i0520000.jpg
 

49. 
A saturated hydrocarbon is represented by which structural formula(s)?
 

50. 
An aromatic hydrocarbon is represented by which structural formula(s)?
 



 
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