CT: Anachem > Mock > Flashcards

Mock Flashcards

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1
Q

What is the scientific notation of 0.0078 ug/ml of compound A?

A

7.8 x 10-3 gg/mL

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2
Q

Which of the following is an extensive property of matter?

A

no. of moles

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3
Q

Which does NOT indicate a chemical change?
A. change in color
B. change in size
C. change in shape
D. change in color

A
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4
Q

Mothballs are used as deodorizer and as pesticides. Upon exposing them in air for a few hours, they disappeared. Which of the following best explains the scenario?

A. The mothballs underwent sublimation.
B. The mothballs underwent melting then vaporization.
C. The mothballs reacted with some component in the air.
D. None of the above.

A

The mothballs underwent sublimation.

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5
Q

Which of the following is described as having components that can be physically separated?

A

mixture

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6
Q

Which of the following is TRUE for C-13 isotope?

A

6 protons and 7 neutrons

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7
Q

It is the statement that contains the result of the experiment and checks if the hypothesis is correct or not.

A

conclusion

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8
Q

Which of the following is NOT a possible set of quantum numbers?
A. n = 3, l = 1, ml = -1, ms = -1/2
B. n = 3, l = 0, ml = 0, ms = -1/2
C. n = 3, l = 0, ml = -1, ms = -1/2
D. n = 3, l = 1, ml = 0, ms = -1/2

A

n = 3, l = 0, ml = -1, ms = -1/2

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9
Q

A certain radioisotope has a half-life of 9 days. What percentage of an initial mass of this isotope remains after 25 days?

A

14.58

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10
Q

Which will cause the mass of a metal block to increase?
A. putting it in a freezer
B. heating it
C. measure in Jupiter
D. none of the above

A

D. none of the above

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11
Q

Chromium is a member of which of the following?
A. Actinides
B. Lanthanides
C. Alkali metals
D. Transition metals

A

D. Transition metals

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12
Q

Which of the following is commonly used as components in pesticides? This group is also characterized as having seven valence electrons.

A

Halogens

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13
Q

Which is the correct arrangement for increasing affinity for electrons?
A. K < Na < Cl < Ne
B. Na < K < Cl < Ne
C. Ne < K < Na < Cl
D. Ne < Na < K < Cl

A

Ne < K < Na < Cl000

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14
Q

Which of the following atoms is the largest?
A. Cs
B. Sr
C. Ga
D. As

A

Cs

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15
Q

Which of the following oxides is likely to be basic in aqueous solution?
A. SO2
B. CO2
D. MgO
D. P2O5

A

MgO

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16
Q

Which of the following substances is not basic?
A. Baking soda
B. Apple Juice
C. Borax
D. Seawater

A

Apple Juice

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17
Q

What is the most common isotope of hydrogen?
A. H has only one isotope
B. Protium
C. Deuterium
D. Tritium

A

Protium

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18
Q

Fluorine is capable of forming covalent bonds with which of the following element?
A. Zinc
B. Boron
C. Lithium
D. Calcium

A

Boron

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19
Q

How many significant figures are there in the 3.400 g?

A

4

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20
Q

A salt solution of which metal produces a bright red color in a flame test?
A. Ba
B. Na
C. Ca
D. Ra

A

Ra

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21
Q

An 30.2-g soil sample is dried to a constant mass of 23.3 g in a water content determination procedure. Determine the weight % of water in the sample.

A

29.61%

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22
Q

Which element is a pale-yellow gas that reacts with water?

A
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23
Q

Which of the following does NOT describe a nonpolar bond?

A
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24
Q

Which of the following statements is TRUE?

A
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25
Which of the following covalent compounds has a tetrahedral geometry?
26
Which of the following is a polar molecule?
27
Which compound has the strongest intermolecular force of attraction?
28
Which of the following is NOT an indication of strong IMFA?
29
What is the name of the compound PCl3?
30
What is the chemical formula of plumbous oxide?
31
What is the chemical formula of mercurous chloride?
32
Polar molecules include which of these?
33
Predict the products of the following acid-base reaction: NH3(aq) + HNO3(aq) →
34
At 25°C a gas expands from 30 kPa and 5.0 L to 70°C and 10 kPa. Calculate its final volume.
35
What is the density of oxygen at 1 atm and 25°C?
36
What happens to the volume of a fully inflated balloon when it is taken outside on a cold day?
37
Liquid A has lower boiling point than liquid B. Which of the following is true about the boiling point of the solution formed upon mixing A and B?
38
It is the temperature at which solid and liquid coexist.
39
How many atoms does a kilogram of copper (63.55 g/mol) metal have?
40
Determine the actual volume contained in a 50.0 mL volumetric flask given the following data: Mass of water: 50.1227 g; Density of water at 25°C: 0.99707 g/mL.
41
A solution is ______ if more solute can dissolve in it.
42
An analysis of a compound shows 62.04% C, 10.41% H, and 27.55% O. Which of the following is the most probable identity of the compound?
43
When the equation above is balanced, which of the following ratios is TRUE?
44
How many grams of KCl can be formed from 2.73 grams of KClO3?
45
Consider the complete combustion of glucose. If 25 g of glucose was burnt with 40 g of oxygen, how many grams of the excess reactant remained unreacted?
46
Ethanoic acid (MM = 60.05 g/mol) and ethanol (MM = 46.07 g/mol) react to form ethyl ethanoate (88.11 g/mol) and water. Twenty grams of ethanoic acid reacted with 10 grams of ethanol, and 17 grams of ethyl ethanoate was obtained. What is the percentage yield of the reaction?
47
What is the pH of 1M HCl?
48
How to balance: H2O → O2 + H2
49
Determine the molality of 6 M sulfuric acid solution with specific gravity equal to 1.34.
50
Determine the weight of calcium chloride needed to make 0.5 L of 0.5 M solution.
51
A solution has been prepared by transferring 60 mL from Ortho-phosphoric acid 85% (v/v) H3PO4 and diluting it to 1.0 L, what is the concentration of the new solution?
52
A 2.4 L of HNO3 solution reacts with 63 mL of 1.9 N Ba(OH)2 to produce a neutral solution. What is the molar concentration of the original HNO3 solution?
53
Which of the following is false about pH indicators?
54
A solution is prepared by adding 0.1 M H2CO3 and 0.1 M NaHCO3. 0.01 mole HCl is added to 1 liter of the prepared solution. The pH of the resulting solution is close to? The pKa of H2CO3 is 6.37.
55
This part of an electrochemical cell maintains electrical neutrality.
56
In a galvanic cell, reduction occurs in the ______ while in an electrolytic cell, oxidation occurs in the ______.
57
When NH4Cl hydrolyzes, the resulting solution is ______.
58
What type of cell converts chemical to electrical energy?
59
Which statement is true?
60
The Kjeldahl method is the worldwide standard for calculating the protein content in a wide variety of materials. What element is being analyzed in Kjeldahl method?
61
When water is heated in a beaker, bubbles of air form on the side of the glass before the water boils. This shows that ______.
62
A student wants to improve the accuracy of a 9.40 mL liquid using a 100 mL graduated cylinder. Which of the following should he do?
63
Which of the following is the most appropriate container for hexane?
64
Which of the following is NOT a proper laboratory practice?
65
Which of the following is TRUE?
66
Which of the following is a treatment for HF burns?
67
This type of glass is commonly used for laboratory glassware at relatively low temperatures because green impurities can be produced from it if heated at very high temperatures.
68
Which of the following shows the correct arrangement of the regions of the electromagnetic spectrum in terms of wavelength?
69
A 3.52 x 10^-4 M solution of KMnO4 in a 1.00-cm cell has an absorbance of 0.855 at 525 nm. Calculate the molar extinction coefficient for the permanganate ion.
70
Why is it generally preferable to use absorbance as a measure of absorption rather than % transmittance?
71
Column chromatography is based on the principle of ______.
72
Which of the following statements is correct?
73
The components of the mixture in column chromatography are eluted in order of ______.
74
The height equivalent of a theoretical plate (HETP) has all of the following characteristics EXCEPT ______.
75
Which of the following focuses on Quality Management Systems?
76
The following are proper practices in storing materials and equipment EXCEPT ONE.
77
A solution has a pH of 3.72 with an absolute certainty of ±0.03. Determine the H+ concentration of the solution and its corresponding absolute certainty.
78
If a fire extinguisher has a red body and a blue band, what is its content?
79
Type of analysis where the amounts of all constituents in the samples are determined.
80
Method consisting a set of instructions issued by a national standards body.
81
It is a detailed written instruction to achieve uniformity in the performance of a specific function.
82
It accounts for all the other components in the mixture that are not under investigation.
83
In the determination of weight percent content of iron in an iron ore by gravimetric method, which of following statement/s is/are true?
84
When qualifying a working standard, what is the best type of reagent to use?
85
Requirements of a primary standard.
86
An analysis of ore assays about 1.5% iron. What minimum sample mass should be taken if the relative error resulting from a 0.5-mg loss is not to exceed -0.2%?
87
Which of the following correctly describe/s the detection limit?
88
It is a part of quality system that includes laboratory operations whose objective is to ensure that the data generated by the laboratory are of known accuracy to some stated, quantitative degree of probability.
89
Which of the following are possible routes of exposure of the hazardous effects of waste?
90
Type of quality control sample used to evaluate the effects of sample matrices on the performance of an analytical method.
91
Locating the adulterated portion of the lot for sampling is an example of ______.
92
The quantity of material which is assumed to represent a single population for sampling purposes.
93
What is the name of RA 6969?
94
Calculate for the percent relative uncertainty for the analyte's concentration.
95
Report the absolute uncertainty together with the analyte's concentration.
96
A solid waste management practice which refers to the controlled decomposition of organic matter by microorganisms, mainly bacteria and fungi, into a humus-like product.
97
What type of container should be used when handling or storing hydrogen fluoride?
98
In handling diethyl and other ethers, the following practices are correct except for one.
99
The responsibilities of chemists and chemical technicians embodied in the Code of Ethics include all EXCEPT ______.
CT: Anachem
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