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You should AVERAGE answering each question in less than 100 seconds for this exam Note: All of the following questions contain only one best answer. Circle the letter that best corresponds with the question. |
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1 |
Chlorine is toxic. |
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A. |
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True |
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B. |
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False |
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2 |
Chlorine is an irritant to breathing organs of the body. |
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A. |
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True |
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B. |
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False |
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3 |
Chlorine is only applied at the treatment plant influent (prechlorination) or at the effluent (postchlorination). |
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A. |
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True |
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B. |
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False |
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4 |
When chlorine combines with moisture, the resulting mixture is corrosive. |
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A. |
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True |
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B. |
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False |
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5 |
Leaking chlorine cylinders may be shipped if they are properly tagged. |
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A. |
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True |
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B. |
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False |
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6 |
To improve disinfection with chlorine, extending the contact time is generally more effective than increasing the chlorine dose. |
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A. |
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True |
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B. |
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False |
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7 |
Effluent from a wastewater treatment plant must be sterilized in order to protect the downstream users of the receiving waters. |
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A. |
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True |
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B. |
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False |
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8 |
When chlorine is applied directly into the chlorine contact basin, the continuous influent flow provides the needed mixing action. |
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A. |
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True |
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B. |
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False |
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9 |
Sulfur dioxide smells like chlorine. |
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A. |
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True |
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B. |
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False |
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10 |
You should never tamper with or apply heat to the fusible plug of a chlorine container. |
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A. |
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True |
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B. |
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False |
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11 |
Air padding is the practice of filling partially empty chlorine tank cars with air to prevent vaporization of the liquid chlorine. |
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A. |
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True |
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B. |
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False |
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12 |
Postchlorination is generally more effective in a well-clarified effluent than in a turbid one. |
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A. |
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True |
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B. |
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False |
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13 |
Hypochlorite compounds are available only in liquid form. |
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A. |
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True |
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B. |
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False |
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14 |
Hydrogen sulfide is found in most collection systems. |
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A. |
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True |
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B. |
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False |
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15 |
Postchlorination is used to disinfect the effluent from a wastewater treatment plant. |
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A. |
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True |
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B. |
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False |
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16 |
Knowledge of first aid is required of a competent treatment plant operator. |
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A. |
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True |
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B. |
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False |
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17 |
Never use soapy water to look for a sulfur dioxide leak. |
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A. |
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True |
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B. |
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False |
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18 |
Evaporators are used to remove moisture from the liquid chlorine delivery system |
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A. |
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True |
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B. |
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False |
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19 |
Ton chlorine tanks should be stored on the sides with their withdrawal valves positioned one above the other. |
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A. |
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True |
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B. |
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False |
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20 |
Emergency chlorine repair kits and approved respiratory protective devices should be stored inside the room where chlorine is used or stored. |
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A. |
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True |
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B. |
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False |
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21 |
The sulfur dioxide dechlorination reaction occurs in a relatively short time so no contact basin is needed. |
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A. |
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True |
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B. |
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False |
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22 |
A graduated cylinder measures liquid volumes more accurately than beakers but less accurately than burets. |
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A. |
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True |
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B. |
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False |
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23 |
A frosted band near the top of a pipet means the small amount of liquid remaining in the tip should be blown out and added to the receiving vessel. |
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A. |
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True |
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B. |
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False |
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24 |
If at all possible, samples for the BOD test should be collected after chlorination |
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A. |
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True |
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B. |
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False |
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25 |
A "blank" is used in lab tests for comparison purposes. |
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A. |
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True |
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B. |
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False |
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26 |
The time of day when a sample is collected will affect the sample's test results. |
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A. |
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True |
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B. |
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False |
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27 |
The end point of a titration is reached when there is a measurable change (often a color change) in the solution being tested |
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A. |
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True |
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B. |
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False |
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A. |
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True |
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B. |
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False |
28. Acids and bases can safely be mixed together.
A. True
B. False
29. Both acids and bases can injure you.
A. True
B. False
30. A rubber bulb should usually be used to pipet samples except thick sludge samples, which it may be necessary to pipet by mouth.
A. True
B. False
31. When washing your hands after working with wastewater, the kind of soap is less important than the thorough use of soap.
A. True
B. False
32. Acid may be added to water, but not the reverse.
A. True
B. False
33. A wastewater with a pH of 8.3 is basic.
A. True
B. False
34. When preparing a composite sample, the individual samples must be vigorously mixed before the portion for the composite is withdrawn and then the entire composite sample should be vigorously mixed.
A. True
B. False
35. The concentration of hydrogen sulfide in wastewater flowing through a manhole is directly proportional to the concentration of H2S gas in the manhole atmosphere.
A. True
B. False
36. The saturation concentration of dissolved oxygen in water varies directly with temperature.
A. True
B. False
37. For practical purposes, one mg/L equals one part per million parts (ppm).
A. True
B. False
38. Effluent suspended solids samples may be collected any place in the effluent channel.
A. True
B. False
39. The BOD test is an indication of the organic content of wastewater.
A. True
B. False
40. A Class A-B-C fire extinguisher is usually the most suitable type for laboratory fire situations.
A. True
B. False
41. The suspended solids test should be tun on the same sample of mixed liquor that is used for the settleability test.
A. True
B. False
42. The range of values is determined by arranging the measurements in ascending or descending order.
A. True
B. False
43. The mean value and range of data describe the dispersion of data.
A. True
B. False
44. When a group of measurements includes one that is much larger than the others, the mean value will most nearly represent the average value.
A. True
B. False
45. The logarithm of a measurement is the sum of its characteristic and meniscus.
A. True
B. False
46. Moving averages are an effective way to detect trends because they smooth out fluctuations in the raw data.
A. True
B. False
47. A variance value is a trend value.
A. True
B. False
48. Presentation of data in tables, graphs, and charts makes it more accurate.
A. True
B. False
49. Instruments calibrated in the factory should be recalibrated after installation and use.
A. True
B. False
50. A "totalizer" is an averaging type of recorder.
A. True
B. False
51. Probability in percent is calculated the same way as the geometric mean.
A. True
B. False
52. Lab analyses of receiving water quality may be discarded once they have been reported to the appropriate regulatory agency.
A. True
B. False
53. Glassware or equipment may be held in your bare hands while heating in order to accurately control the rate of heating.
A. True
B. False
54. Test tubes are used for the settleable solids test.
A. True
B. False
55. The COD test is used to measure the strength of wastes that are too toxic for the BOD test.
A. True
B. False
56. Employers must provide employees with copies of material safety data sheets for any chemical substance the employee may come into contact with in the workplace.
A. True
B. False
57. Timed composite samples should be used to measure the temperature of the point source of interest.
A. True
B. False
58. The treatment plant superintendent is the only person responsible for laboratory safety.
A. True
B. False
59. Acids can injure you, but not bases.
A. True
B. False
60. Water may be added to acid, but not the reverse.
A. True
B. False
61. The pH scale ranges from 1 to 14.
A. True
B. False
62. The jar test is used to measure the conductivity of the water.
A. True
B. False
63. The Safe Drinking Water Act stipulates specific monitoring requirements for turbidity.
A. True
B. False
64. Dissolved oxygen improves the taste of water.
A. True
B. False
65. The reagent most frequently used in laboratory analyses is distilled water.
A. True
B. False
66. Measuring the intensity of the color enables the concentration of a substance in water to be measured.
A. True
B. False
67. A sample which has a high color intensity will have a low percent transmittance and a high absorbance value
A. True
B. False
68. In most natural waters, chloride is the principal cation.
A. True
B. False
69. The Modified Winkler procedure is used to measure dissolved mineral salts.
A. True
B. False
70. Temperature of the sample is a critical factor when conducting a Marble Test.
A. True
B. False
71. The formation of white floc during the DO test indicates that there is DO present in the sample.
A. True
B. False
72. As the temperature of water increases, the DO saturation value increases.
A. True
B. False
73. Nitrite represents the most completely oxidized form of nitrogen found in water.
A. True
B. False
74. A desiccator serves the same purpose as a muffle furnace.
A. True
B. False
75. Dry ice should be used to keep THM samples cool when shipping and storing.
A. True
B. False
76. If the manganese concentration in a sample cannot be determined immediately acidify the sample with acetic acid.
A. True
B. False
77. The MCL compliance for trihalomethanes is determined by the running average of four monthly averages.
A. True
B. False
78. In the laboratory, broken glass should be disposed of in wastebaskets.
A. True
B. False
79. Samples collected for monitoring of secondary contamination should be taken at a free-flowing outlet of water being delivered to the consumer.
A. True
B. False
80. The SDWA requires the same check sampling procedures whenever an MCL is exceeded for any contaminant.
A. True
B. False
81. Samples for turbidity must be taken at points where water enters the distribution system.
A. True
B. False
82. Laboratory analyses of water quality indicators are the only plant records that may not be discarded.
A. True
B. False
83. Frequent laboratory analysis of source water is a water agency's best protection against deliberate contamination.
A. True
B. False
84. The Total Coliform Test is a reliable indicator of potential presence of harmful organisms.
A. True
B. False
85. Field test kits can be relied on to prove the presence of a contaminant.
A. True
B. False
86. Methemoglobinemia is a disease caused by trihalomethanes.
A. True
B. False
87. To calculate the standard deviation, the geometric mean must first be calculated.
A. True
B. False
88. Farenheight, Centrigrade, Celcius and Kelvar are different scales used to measure temperature.
A. True
B. False
89. Always pour caustic into water, just like pouring acid into water.
A. True
B. False
90. If a strong alkaline solution floods the eyes, serious impairment of vision can be prevented if first aid is quickly applied.
A. True
B. False
91. Most preservation methods are only partially successful so all samples should be analyzed as soon as possible after they are collected.
A. True
B. False
92. The QA/QC procedures used in the field are the same as those used in the laboratory.
A. True
B. False
93. A D-type extinguisher should be available where burning metals might be encountered.
A. True
B. False
94. Caustic soda is a common name used for Sodium Hydroxide.
A. True
B. False
95. Specific conductivity is usually associated with a high TDS concentration.
A. True
B. False
96. Carbonate hardness is the only type of hardness encountered in water supplies
A. True
B. False
97
A confined space atmosphere may be hazardous if flammable
gas or vapor levels exceed their flammable limits by more than 10 percent
A.
True
B.
False
98
An ignition source like grinding or weldingcould
cause a fire in a confined space
A.
True
B.
False
99
Entrapping design means a space that is very
deep or dark
A.
True
B.
False
100
Heat stroke or heat-related exhaustion is
hazardous because it limits your ability to get out of a confined space
A.
True
B.
False
101
Grounding connects electrical power to earth
A.
True
B.
False
102
Two-pronged plugs provide grounding
A.
True
B.
False
103
Electrical shock is unpleasant, but not dangerous
A.
True
B.
False
104
The longer your contact with electricity,
the greater the shock
A.
True
B.
False
105
Pipeting by mouth must never be
permitted, unless a suction bulb is not available
A.
True
B.
False
106
A.
True
B.
False
Matching
For the next six questions:
For each test or calculation listed in the left column, select the sample type from the right column that is most
suitable for that test or calculation.
TEST
SAMPLE TYPE
1. Coliforms
a. Composite
2. Dissolved oxygen
b. Grab
3. pH
4. MCRT
5. Residual chlorine
6. Temperature
WORD
DEFINITION
1. Aliquot
a. Capacity to resist pH change
2. Ambient
b. Portion of a sample
3. Blank
c. Surrounding
4. Buffer
d. Test run without sample
Possible definitions of the words listed below are given on the right. For each word listed on the left, try to
find its definition on the right. Mark the number of the definition in the answer column for each word. For example,
if the definition of a word is after the letter A, mark column A on your answer sheet after the word.
Name
Chemical Symbol
1. Sulfuric acid
a. H2SO4
2. Calcium Carbonate
b. Al(SO4)3
3. Aluminum sulfate
c. NaCO3
4. Soda ash
d. CaCO3
Match the following names with the symbols:
Match the following elements
with the symbols:
Name
Symbol
1. Carbon
a. H
2. Hydrogen
b. C
3. Oxygen
c. N
4. Nitrogen
d. O
Name
Symbol
1. Lye
a. ClO4¯
2. Perchlorate
b. CaO
3. Lime
c. CaCO3
4. Limestone
d. NaOH
Match the following names with the symbols:
Match the following names
with the symbols:
Name
Symbol
1. Hydrogen sulfate
A. Na2SO4
2. Bisufate
B. HSO4¯
3. Ammonium sulfate
C. NH4S
4. Sodium Sulfate
D. (NH4)2SO4