1
Q
How many significant figures does this number have: 104,000?
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2
Q
Convert this number to PROPER scientific notation: 0.000780 x 10-8
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3
Q
Using proper scientific notation, how would you round the number 9.9813 x 10-5 to two significant figures?
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4
Q
Using the rule for multiplication & division, what is the answer to this calculation: (8.090 mg) ÷ (0.009 mL) = ?
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5
Q
The answer to the calculation below should be reported to how many significant figures? [(97+19.5)/( 434.97)] =
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6
Q
The law that regulates the practice of chemist and chemical technician in the Philippines
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7
Q
Convert 110.00°C to °F:
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8
Q
A chemist measured the mass of a wire using an analytical balance with the least count 0.001 g. The measured value should be recorded as:
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9
Q
What do we mean by ethics?
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10
Q
The study of ___, as contrasted with legal, obligations is called ethics.
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11
Q
__________ are beliefs and attitudes we have that can actually conflict with our ethical decision.
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12
Q
The unit for the measurement of density?
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13
Q
454 mg is equivalent to ________ kg?
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14
Q
The type of biological Safety Levels which requires a separate building.
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15
Q
Which of the following is not a chemical-related health hazard?
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16
Q
This hazard symbol is used when something is:
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17
Q
If you transfer chemicals from a labeled container to a portable container, you don’t need to comply with standard hazardous material labeling requirements when:
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18
Q
Sections of the SDS regulated by OSHA
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19
Q
Section of the SDS that describes Hazard Identification
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20
Q
SDS Section which gives recommendations for the proper PPE
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21
Q
Which of the following statements is true of the pictograms on HCS labels?
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22
Q
A document that lists information relating to occupational safety and health for the use of various substances and products.
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23
Q
The type of toxicity caused by long-term exposure:
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24
Q
An organic compound the production of which was banned in the US in 1979 due to its environmental toxicity and classified as persistent organic pollutant
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25
The most electronegative atom:
26
Referring to the periodic table, select the most electronegative atom in the given set: K, Mg, Ca and Na:
27
Referring to the periodic table, arrange the following elements in terms of increasing electronegativity: Ca, Cs, S, Sc & Si
28
Referring to the periodic table, which of the set of elements has the highest ionization energy: S, Al, Br, Se
29
Referring to the periodic table, which of the set of elements has higher electron affinity: Br, Se, S, Al
30
Arrange the given according to increasing ion size: Cation (C), Anion (A), Neutral Atom (N)
31
K+, potassium as given has a number of electrons equal to:
32
The formula for hydrosulfuric acid is:
33
Al+3, Aluminum ion has number of electrons equal to:
34
The subatomic particle with negative charge:
35
The region where protons can be found:
36
In the reaction, H2 + O2 → H2O, the limiting reactant is:
37
The limiting reactant is the:
38
The correct formula for Aluminum Bicarbonate is:
39
The formula for Iodic Acid is:
40
The correct name for the chemical formula, PCl6 is:
41
Which of the following compounds has ionic bond:
42
Which of the following compounds has covalent bond:
43
What is the maximum number of grams of NH4SCN(s) that can be prepared from 9.00 g of CS2(l) and 3.00 g of NH3(g)?
44
In the given chemical reaction, identify which type of reaction: Zn(s) + AgNO3(aq) → Ag(s) + Zn(NO3)2(aq)
45
In the given reaction: CaCO3 + HCl(aq) → CaCl2(aq) + CO2 + H2O the coefficients for the balanced reaction:
46
The correct chemical formula for calcium sulfate decahydrate is:
47
The members of the group 2 elements:
48
Can conduct electricity only at higher temperatures. They are:
49
3.54 g H2SO4 has equivalent number of moles: H=1, S=32, O=16
50
The % mass of NaOH is:
51
The molarity of the solution is:
52
The molality of the solution is:
53
The mole fraction of NaOH is:
54
The mole fraction of H2O is:
55
234 g of sodium chloride is reacted with sulfuric acid to produce hydrogen chloride gas and sodium sulfate. Which of the following statement is not true:
56
Which of the following statements about acids and bases is not true:
57
Which statement about Arrhenius acids is FALSE?
58
Strong bases are:
59
What is the pH of a 1 x 10–4 M HCl solution?
60
What is the pH of a 1 x 10–5 M KOH solution?
61
What is the molarity of an HCl solution if 50.0 mL is neutralized in a titration by 40.0 mL of 0.400 M NaOH?
62
Which are the correct products for these reactants HCl + NaOH
63
The symbol for Silver element is:
64
Which of the following substances is a salt:
65
Which of the following compounds contains an ionic bond?
66
Systematic errors may arise from avoidable sources, except
67
Systematic errors primarily influence a measurement's _________.
68
An improperly calibrated thermometer may give accurate readings within a certain temperature range, but become inaccurate at higher or lower temperature.
69
An error caused by not setting an instrument to zero prior to its use is called an ______ error.
70
In the decomposition and dissolution of solids during sample preparation, which of the following is expensive and often the last resort?
71
Reliability of the results decreases with a decrease in the level or concentration of the:
72
Properties of nitric acid making it the preferred acid for digesting samples for the analysis of metals
73
Primary sample preparation method for organics
74
Possible sources of contamination during sample preparation include:
75
Containers that should not be used for dry ashing because the elevated temperatures exceed the melting point of these materials
76
Determinate errors, also called ____________.
77
An error that is known to have occurred but was unavoidable
78
The maximum holding time for acid preserved samples that will be subjected to determination of metals is
79
Refers to the repeatability of a measurement.
80
A change in the analytical signal caused by anything in the sample other than analyte.
81
Medium containing analyte.
82
The total error of an analytical result is the sum of
83
The holding time for samples for metal determination preserved using nitric acid, 4 mL of dilute 3:1 is
84
The following numerical results were obtained in a given laboratory experiment: 0.09376, 0.09358, 0.09385, and 0.09369. Calculate the relative parts per thousand standard deviation
85
The following are analytical strategy steps except for one.
86
A student determines the weight of an object on an analytical balance to be 12.2843 g. The actual weight is 12.2845 g. What kind of error is this?
87
A given analytical test was performed five times. The results are 6.738, 6.738, 6.737, 6.739, and 6.738%. The results are:
88
Process by which a sample population is reduced in size to an amount of homogeneous material that can be conveniently handled in the lab in which the composition is representative of the population.
89
A sample that has all the characteristics in exactly the same proportion as the bulk sample where it came from:
90
Locating the adulterated portion of the lot for sampling is an example of
91
In gravimetric analysis,
92
Glass container is not suitable for
93
To increase/decrease analyte concentration, pre-concentration is needed for almost all trace analysis, ________ is used for the analysis of highly contaminated samples so the concentration falls within the calibration range.
94
Chemical derivatization is used to increase or decrease volatility for _________ analysis
95
Acid digestion via hot-plate digestion or microwave-assisted is one way of sample preparation in the analysis of
96
GFAA (Graphite Furnace Atomic Absorption) do not use HCl since Cl- interferes. Diluted ______ acid is used.
97
Partitioning of analytes between water phase and organic phase
98
The original undivided sample that was taken directly from the bulk system being characterized.
99
A primary sample is the same as
100
If a water sample is to be analyzed for trace levels of metals, glass container for sampling and storage is inappropriate due to the following reasons except for one.
101
Sample preparation depends on
102
An acid that turns paper towel black, a very dense syrupy liquid that gets especially hot when mixed with water is
103
PEL stands for
104
What does SPE stand for?
105
The label CORROSIVE on a chemical container indicates
106
When diluting an acid with water,
107
When operating a fire extinguisher, remember the mnemonic PASS. PASS represents the steps used to properly operate the extinguisher and it stands for which of the following?
108
A "Class-A" fire extinguisher can be used to treat fires involving _____ as fuel sources.
109
Given the unbalanced equation C6H12O6+O2→CO2+H2O, how many grams of carbon dioxide will be produced from one mole of glucose and six moles of oxygen?
110
A blank used to test the integrity of reagents used in the laboratory.
111
Which sampling term is incorrectly defined?
112
The liquid solution containing the analyte is passed through a cartridge containing a solid sorbent.
113
An example of a nonpolar organic solvent that is often used for extracting analytes from aqueous solutions
114
The analyte in a sample may be too concentrated or too dilute for the chosen method. If it is too concentrated, a dilution with a compatible solvent may be performed. The dilution should be performed with _______________ glassware.
115
A ___________ is a substance used in a chemical reaction in an analytical laboratory because of its specific applicability to a given system or procedure
116
Choose the sample that would be best dissolved by HNO3.
117
From the following list, choose those samples that would be best dissolved by HCl.
118
Calculate the equivalent weight and normality for a solution of 6.0 M H3PO4 given the following reactions:
119
What is the molality of solution made by dissolving 25 g of NaCl in 2.0 Liter of water?
120
The amounts of all constituents in the samples were determined
121
Implies that the constituent determined was present in high concentration
122
Quantitative chemical analysis of weighing a sample, usually of a separated and dried precipitate.
123
A chemical grade of highest purity and meets or exceeds purity standards set by American Chemical Society
124
Which of the following is a primary standard for use in standardizing bases?
125
How would you prepare 500.0 mL of 0.2500 M NaOH solution starting from a concentration of 1.000 M?
126
A student performs five titrations and obtains a mean result of 0.110 M, with a standard deviation of 0.001 M. If the actual concentration is 0.100 M, which of the following is true?
127
How many grams of Sodium Persulfate (Na2S2O8) are required to prepare a 1 L solution of 10% (w/v)?
128
A solution has been prepared by transferring 60 mL from Ortho-phosphoric acid 85% (v/v) H3PO4 and diluting to 1.0 L. What is the concentration of the new solution?
129
A student has three stock standard solutions of Zn 2000 ppm, Cd 1500 ppm, and Pb 1000 ppm. A student took 10 mL from each solution and transferred it to 200 mL volumetric flask. What is the final concentration?
130
Bidirectional harpoons or double arrows (⇆) should be used to indicate ________ reactions
131
In the preparation of 1 liter of 1.0 N acid from 35% Hydrochloric Acid, what weight of the impure acid should be taken?
132
A few ways in which solution composition can be described are as follows.
133
The substance which does the dissolving and must be greater than 50% of the solution.
134
Naphthalene (C10H8) is one of aromatic hydrocarbons measured by GC-MS. If molecular weight is 128.6 g/mol, how many milligrams are required to prepare 100 mL of 2,000 ppb stock standard solution (purity 91.5%)?
135
A student has to measure out 9.40 mL of a liquid and selects a 100 mL graduated cylinder. To improve the accuracy, it would be most effective to:
136
Nitrate (NO3-) anion solution prepared by dissolving 3.0 g of KNO3 in 250 mL of water. What is the concentration of Nitrate ion in Molarity and ppm?
137
The number of formula mass of any solute dissolved in 1 liter of solution
138
A 0.217 g sample of HgO reacts with excess iodide ions according to the reaction. Titration requires how many mL of 0.10 M HCl to reach equivalence point?
139
If the theoretical yield for a reaction was 156 grams and I actually made 122 grams, what is my percent yield?
140
The method of standardization can be used if a _______________ reacts quantitatively with the reagent needed in the standard solution.
141
You have a stock solution of 15.8 M HNO3. How many mL should you dilute to make 100.0 mL of 0.250 M HNO3?
142
If 56.0 g of Li reacts with 56.0 g of N2, 93.63 grams of Li3N can be produced. How many grams of Nitrogen remains? What is the limiting reactant?
143
HCl cannot be considered to be a primary standard because of its gaseous form at room temperature, but its solutions may be standardized against anhydrous ______.
144
When making a solution from a solid reagent, if necessary, dry the solid reagent on a clean, oven dried, watch glass at 105 ºC for 2 hours and cool it in a desiccator.
145
Requirements of a primary standard.
146
Blank samples are prepared so that you have a measure of the amount that needs always to be added to or subtracted from the end point to achieve the ________ point.
147
A specially manufactured analytical reagent of exceptional purity for standardizing solutions and preparing reference standards.
148
A reagent that meets the standards of purity established by the manufacturer.
149
Chemicals of reasonable purity for applications that have no official standard for purity.
150
Solvents of suitable purity for use in spectrophotometric procedures.
151
Chemicals of sufficiently high quality to be suitable for use in some syntheses.
152
When an open bottle of _________________ sits next to an open bottle of ammonium hydroxide, thick white fumes form.
153
What acid is a highly corrosive mineral acid and is also known as aqua fortis and spirit of niter?
154
____________________ diffuses through skin and is especially bad when it gets under the fingernails.
155
_____________________ is used to dissolve the sample for the Kjeldahl analysis.
156
A mixture of concentrated HNO3 and HCl in the ratio of 1:3 HNO3:HCl is
157
If a given procedure calls for a pure methyl alcohol of the highest grade, then the ___________ should be used.
158
What classical method of analysis is characterized by the fact that the measurement of weight is the primary measurement?
159
What is the percent loss on drying if a sample weighs 4.5027 g before drying and 3.0381 g after drying?
160
The onset of a phase transition in a small region which can be the formation of a bubble or of a crystal from a liquid.
161
Refers to a solution that contains more of the dissolved material than could be dissolved by the solvent under normal circumstances.
162
What type of balance uses an electromagnet to balance the object to be weighed on a single pan?
163
A balance that is used to obtain four or five digits to the right of the decimal point in the analytical laboratory is called the (precision is ±0.1 or ±0.01 mg).
164
Refers to the process by which a balance is checked to see if the weight obtained for an object is correct.
165
Gravimetric analysis methods proceed with the following steps:
166
This is an example of a loss through volatilization (evaporation) under temperature conditions at which water would volatilize.
167
Ambient laboratory conditions are not the same as standard conditions, therefore the volumes dispensed in volumetric glassware are often not the same as the manufacturer's specifications. This causes a _________ error.
168
Glass cuvettes are typically for use in the wavelength range of visible light, whereas fused quartz tends to be used for ____________ applications.
169
In this column type, the retention is governed by the interaction of the polar parts of the stationary phase and solute.
170
A stable light source in AAS analysis, which is necessary to emit the sharp characteristic spectrum of the element to be determined
171
The HPLC column type in which molecules are separated according to size.
172
Non Polar Reverse phase and C8 (octyl bonded silica) are commonly used for hydrophobic analytes in solid phase extraction. An example is
173
Filters that can be heated and used in gravimetric analysis.
174
Objects cannot be weighed when hot or warm. But if you were to take a sample out and wait for it to cool it would pick up moisture like that so put it in ________.
175
The following are common desiccants except for _______
176
During ignition for ashing, muffle furnaces that go up to 1100°C are used primarily for this and ________ is needed to contain the sample.
177
In making standard solutions, ______ are used for measuring liquid with high accuracy.
178
Used for distillation or heating of liquids, allows uniform heating.
179
Most popular burettes are 10 mL, 25 mL and 50 mL types. Which has the highest resolution?
180
Used for vacuum filtration using filter paper.
181
In chromatography, ________ is carried out on glass plates or strips of plastic or metal coated on one side with a thin layer of adsorbent.
182
The nominal volume of water (or mercury) contained, or delivered by an article of volumetric glassware, at its reference temperature.
183
In verification of laboratory glassware, ________ is usually measured in terms of the tolerance, which is the uncertainty in a measurement made with the glassware.
184
Glass apparatus that are generally received with calibration certificates from suppliers.
185
Refers to repeated drying steps until two consecutive weights agree to within a specified precision.
186
Total solids involve measuring a volume of the water or wastewater into a preweighed
187
Equipment that work by the sedimentation principle, where the centripetal acceleration is used to separate substances of greater and lesser density.
188
Also known as droppers or eye droppers, are used to transfer small quantities of liquids.
189
Small, cylindrical plastic containers with conical bottoms, typically with an integral snap cap.
190
A device used in chemical and biochemical laboratories for the efficient and gentle evaporation of solvents.
191
An essential item used in the distillation of liquid mixtures so as to separate the mixture into its component parts.
192
Boiling chips are also known as
193
All proteins absorb electromagnetic radiation of wavelength around 190 nm, which corresponds to a excitation in the protein
194
Chromatography is used to
195
A food scientist has a sample of a plant oil and wants to determine if the oil contains saturated or unsaturated fatty acids. Which of the following spectroscopic techniques would be most useful for this purpose?
196
The concentration at which the calibration curve departs from linearity by a specified amount.
197
A graphical representation of measuring signal as a function of quantity of analyte.
198
What is the path of light through a spectrophotometer?
199
With a “standard” sample with a known absorbance and concentration and a measured absorbance, it is easy to determine an unknown concentration of the same substance by.
200
The highest apparent analyte concentration expected to be found when replicates of a blank sample containing no analyte are tested.
201
Motion of the mobile phase through the stationary phase.
202
A phase which sample is dissolved in may be gas, liquid, or supercritical fluid
203
In spectrophotometric methods, the _________ isolates the specific spectrum line emitted by the light source through spectral dispersion.
204
In AAS method, If the sample concentration is too high to permit accurate analysis in linearity response range, there are alternatives that may help bring the absorbance into the optimum working range.
205
A technique for separating mixtures into their components in order to analyze, identify, purify, and/or quantify the mixture or components.
206
A “modified” stationary phase where polar solutes run fast i.e. reverse order.
207
A graph showing the detectors response as a function of elution time: band’s shapes, position, resolution
208
The pH meter glass probe has two electrodes, one is a glass sensor electrode and the other is a _______ electrode.
209
Conductivity could be determined using the distance between the electrodes and their surface area using Ohm's law but, for accuracy, a calibration is employed using _____ of well-known conductivity.
210
The electrical conductivity of water is directly related to the concentration of dissolved ionized solids in the water or
211
In complexometric titration, the most common used chelating agent is EDTA (ethylenediamine tetraacetic acid). EDTA is classified as a?
212
The light source used in the visible range to 340-1000 nm.
213
The % T of a solution in a 2.00 cm cell is 50. Calculate the %T of this solution in a 1.0 cm cell path length.
214
An air sampling canister was evacuated by the local fire department and brought to the environmental lab for analysis. It was said that the sample was taken very near the site where a rusty 55-gal drum was found by some children. A reported unpleasant smell near the site was reported. Results of gravimetric analysis of the gas in the canister: C – 40%, H – 6.7%, O – 53.33%. What is the liquid in the drum?
215
A comparison of measuring equipment against a standard instrument of higher accuracy to detect, correlate, adjust, rectify and document the accuracy of the instrument being compared.
216
The property of a result of a measurement whereby it can be related to appropriate standards, generally national or international standards, through an unbroken chain of comparisons.
217
A method used to purify individual chemical compounds from mixtures of compounds. It is often used for preparative applications on scales from micrograms up to kilograms.
218
The visual output of the chromatograph. In the case of an optimal separation, different peaks or patterns correspond to different components of the separated mixture.
219
Used to purify sufficient quantities of a substance for further use, rather than analysis.
220
The characteristic time it takes for a particular analyte to pass through the system (from the column inlet to the detector) under set conditions.
221
The basic operating principle of ________ is to force the analyte through a column of the stationary phase by pumping a liquid (mobile phase) at high pressure through the column.
222
Size exclusion chromatography (SEC) is also known as ___________ which separates particles on the basis of size.
223
A type of chromatography where the retention is based on the attraction between solute ions and charged sites bound to the stationary phase. Ions of the same charge are excluded.
224
The liquid or gas entering a chromatographic bed used to effect a separation by "elution."
225
The study of the interaction between radiation (electromagnetic radiation, or light, as well as particle radiation) and matter.
CT: Anachem
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