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Chemistry Wonder World – Exam 2 on Important Molecules, Compounds and Chemical Reactions
© Donald Reinhardt, Nov. 22, 2013
Here are 65 multiple-ohoice exam questions which relate to these two studies modules at science superschool:
These 65 questions help serve as a guide to what you have learned as you test yourself and your chemistry knowledge of molecules, compounds and chemical reactions.
Choose the best answer from the available choices and have fun learning chemistry by testing yourself.

1.-5. According to strict definition, a chemical compound is a chemical union of two different elements. If the numbered item is a compound, mark C. If it is only a molecule, not a compound, mark E.

1. O2    
2. CuCl2   
3. H2  
4. ZnSO4           
5. N2      

6. – 10.  These questions relate to energy and chemical reactions.

6. A reaction which yields or gives off heat or energy is: 
 
A. endothermic   B. exothermic
7. A reaction that requires constant or regular input of energy to drive it or make it go is:
 
A. endothermic   B. exothermic

8. Which type reaction can be used to drive or make other reactions work?

A. endothermic only   
B. exothermic only   
C. both can   
D. neither can

9. Photosynthesis is a clear example of what type of reaction?

A. exothermic   B. endothermic
10. CH4 + O2 ---à CO2 +H20.
 
This reaction above is:
 
A. endothermic   B. exothermic

11.-15. According to strict definition, a chemical compound is a chemical union of two different elements. If the numbered item is a compound, mark C. If it is only a molecule, not a compound, mark E.

11. He2            
12. CuO                
13. OH              
14. H2SO4       
15. NO3      

16. -26. KEY: Use the key below to answer each one of the descriptive, numbered questions.

Chemical Reaction Types or kinds A. Synthesis   
B. Decomposition   
C. Combustion  
D. Single displacement 
E. Double displacement

16. A chemical reaction generates heat and light. This suggests what type of reaction has occurred?

17. H2O2 in the presence of light or heat usually undergoes this type of reaction.

18. A match is struck and a chemical reaction occurs and we see an example of what?.

19.  NaOH + HCl --à  NaCl + HOH (H2O)     
 
20. Na + H2O ---à NaOH + H2
21. Mg + HOH --à Mg (OH)2 +H2             
 
22. CH4 -----à CO2 + H2O          
 
23. Fe + S -----à FeS

24. The NASCAR driver places a key in the ignition and starts the engine.

25. A Christmas candle is burning in the window on a snowy night.

26. An electric current is passed through water. What reaction occurs during this chemical demonstration?

27. Indicate by marking TWO letters and names what the shells of snails, clams and mollusks are made of:  
A. calcium  
B. magnesium  
C. carbonate 
D. phosphorous
28. Indicate by marking TWO letters and names what bones and teeth are chemically composed of:  
A. calcium  
B. magnesium  
C. carbonate  
D. phosphate

29. Stalactites and stalagmites in caverns and caves chemically are: 

A. Mg3(PO4)2   B. MgCO3  
C.  Ca3(PO4)2  D. CaCO3

30. A person has acid indigestion. Indicate the solution you would recommend for someone to take for acid indigestion. 
A. H2CO3   B. NaHCO3  C. NaOH    
 D. HCl

31. If you blow through a straw into plain or ordinary water, what type compound do you produce in a short time? A. acid   B. base

32.  Indicate what accounts for 21% of ordinary air: 
A. hydrogen   B. carbon dioxide  
C. nitrogen     D. oxygen 
33.  Indicate the element that accounts for 78% of ordinary, normal air:
A. hydrogen   B. carbon dioxide  
C. nitrogen     D. oxygen 

34.  What comprises 0.03% of the atmosphere?

A. hydrogen   B. carbon dioxide  
C. nitrogen     D. oxygen 

35.  Yeasts are added to a grape juice or sugar. What gas is produced?

A. hydrogen   B. carbon dioxide  
C. nitrogen     D. oxygen

36.  This same yeast in sugar or grape juice also typically produces:

A. alcohol   B. acetic acid B. pyruvic acid

37.  Indicate what vinegar is chemically:

A. sugar           B. lactic acid 
C. acetic acid  D. pyruvic acid

38. What substance causes muscle fatigue and pain during intense exertion?

A. sugar           B. lactic acid 
C. acetic acid   D. pyruvic acid

 

39. Glycerol can be defined as a poly______?

A. polymer  
B. polymerase  
C. polysaccharide 
D. polyalcohol
E. polyptide

40. What type compounds can react with glycerol to produce a lipid?

A. acids   B. bases   C. sugars

41. What is usually a liquid at room temperature?   A. oil  B. fat

42. What is usually a solid a t room temperature?    A. oil  B. fat

43.  A special and unique bond is noted in fats and oils. What is this bond called?

A. ester                   B. ether 
C. carbohydrate   D. peptide
44. -50. Use the following key to indicate the elemental compositions expected when the numbered compounds are analyzed.     
 
KEY: A. CHO   B. CHONS  C. CHONP
44. proteins  
45. fats  
46. lipids  
47. glucose  
48. DNA 
49. RNA  
50. Ethanol

51. – 63. These are all bonus questions and are counted toward your positive score.

51. If CO2 and CO are added in equal amounts to a solution of hemoglobin molecules which one gas would be expected to bind most strongly to the hemoglobin molecules?

A.  CO  B. CO2

52.  In a room closed room or chamber with plenty of oxygen which one gas would you be most concerned about entering and being in that room with humans or animals?  A. CO   B. CO2

53.  Given the following reaction: 
A + B + C = D + E

Circle the product(s) and also place a P above the product(s).

54. Given the following reaction: 
A + B + C = D + E

Circle the reactant(s) and also place a R above the reactant(s).

55. If we looked for amino acids where would we find them in:

A.  proteins  B. sugars C. lipids  D. nucleic acids

56. If we measured at one mole of glucose how many grams would that equal?

A. 100   B. 180  C. 200

57. A device used to measure energy content of food is called a(n)

A. aerometer     B. barometer  
C. calorimeter   D. thermometer 
E. spirometer

58. If we burned this amount of glucose (one mole) how many calories would we generate?

A. 500   B. 686   C. 1000  
D. no one knows, it has never been done
59. The average active male requires how many calories a day for energy?
A. 3,000 - 5,000   B. 8,000 -10,000  
C. 10,000 -20,000

60. A hormone that is very important in sugar regulation is:

A. thyroxin         B. estrogen 
C. testosterone  D. insulin

61. The sugar regulation hormone  mentioned above is most closely structurally like a:

A. protein  B. lipid  C. oil  D. nucleic acid

62. H2  and He2. These two gasses are placed in separate balloons. When each balloon is touched with a heated electric probe or spark what do we expect to see for a reaction?

A. H2   B. He2  
C. both react about the same  
D. neither reacts with the probe or spark

63. An ester bond is indicated as follows:

A. ROR     B. RCOOR    C. RCONH2
64. For what change in temperature,(in an ordinary range of temperatures) does a reaction rate double?
 
A. 5 degrees  F      B. 10 degrees F
C. 5 degrees  F      D. 10 degrees C
 
65. Consider your known body temperature and the temperature of 32 degrees Farenheit. Assuming chemical reactions can occur at both ends of spectrum, approximately how much faster are chemical reactions at the higher temperature when compared to the lower temperature?
 
A. 4X    B. 6X   C. 8X   D. 10X   E. 14X