問題一覧
1
234000
2
4
3
0.05107
4
Hypothesis
5
Mixture
6
Neither — both density and viscosity are intensive properties
7
The amount of matter in an object
8
None of the above
9
Between the boiling points of A and B
10
Change in shape
11
Separate based on their densities
12
Its solid form is less dense than its liquid form.
13
50.27 mL
14
Continuous random motion
15
Gas particles have negligible volume compared to the container.
16
16.2 g/mol
17
Helium (He)
18
The flask with the smallest volume
19
Decreases as temperature increases
20
It has 6 protons and 6 neutrons.
21
Chlorine
22
Soda ash
23
Mercury(II) chloride
24
It is a bond between different nonmetal atoms.
25
11 g
26
C4H10
27
37.65%
28
Solvent
29
Lower viscosity usually results in better solubility due to easier molecular movement
30
10.0 N
31
100 ppm
32
19.1 ppm
33
10.0 g
34
4.00 mol/L
35
6.81 m
36
0.125 L
37
100 ppm Zn, 75 ppm Cd, 50 ppm Pb
38
Electron pair acceptor
39
Milk of magnesia
40
13
41
10.5
42
Aqueous NaOH turns litmus paper blue, while NH4NO3 does not change litmus color.
43
Lose 3 electrons
44
Mg is the oxidizing agent
45
At the anode
46
They are reduced at the cathode to form metallic silver.
47
Copper (Cu)
48
About 1:1 cyclohexane : toluene (≈50% cyclohexane)
49
Volatile liquids should be weighed by first recording the mass of the empty vial with its cap.
50
Capacity
51
The burette was rinsed with water instead of HCl
52
Store the electrode in distilled water to keep the electrode bulb moist during storage
53
Collect the sample in a container made of material that will chemically react with the sample
54
Glass
55
Small amounts of solvent repeatedly
56
Buchner crucible
57
Short-stem funnel
58
Distillation
59
Milk and water
60
Boil the liquid and place the thermometer bulb in the refluxing vapor (so it reads the vapor temperature)
61
Overheating is still possible
62
It reduces decomposition of temperature-sensitive (heat-labile) compounds
63
Two miscible liquids
64
Provide surface area for vapors to condense
65
The number of theoretical plates in the column
66
2.0%
67
Q-test (Dixon's Q test)
68
High signal-to-noise ratio
69
Matrix
70
Primary standard
71
All of the above
72
Gravimetric analysis
73
Kjeldahl method
74
Conduct electric current, which is the reciprocal of resistivity
75
Increasing temperature has no effect on its value
76
All of the above
77
Liquid and gas only (II and III).
78
Liquids
79
Different compounds are adsorbed on an adsorbent to different degrees.
80
All of the above (spots of colorless compounds are invisible to the eyes; spots can be detected under UV light; spots can be detected by exposing the plate to iodine vapors).
81
Partition chromatography
82
Differential adsorption
83
Chlorophylls and carotenoids
84
Antibodies bound to a covalently attached antigen on a cellulose column
85
Cations
86
Adsorption
87
The more polar the solute, the more strongly it will be adsorbed on a polar surface.
88
Gas-solid chromatography
89
Purge and trap; Solid-phase microextraction (both I and II)
90
Chromatogram
91
Spectroscopic methods require less time and less amount of sample than classical methods.
92
Beer-Lambert's Law
93
Because A is proportional to the concentration of the analyte, whereas %T is not.
94
Calibration check
95
Beer-Lambert's law forms the quantitative basis for all types of absorption spectroscopy of an analyte.
96
Calibration curve
97
All of the above
98
They also absorb light in the UV-Visible region, interfering with the measurement
99
All of the above
100
The rate at which the concentration of reactants decreases or the concentration of products increases with time
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126問 • 3ヶ月前問題一覧
1
234000
2
4
3
0.05107
4
Hypothesis
5
Mixture
6
Neither — both density and viscosity are intensive properties
7
The amount of matter in an object
8
None of the above
9
Between the boiling points of A and B
10
Change in shape
11
Separate based on their densities
12
Its solid form is less dense than its liquid form.
13
50.27 mL
14
Continuous random motion
15
Gas particles have negligible volume compared to the container.
16
16.2 g/mol
17
Helium (He)
18
The flask with the smallest volume
19
Decreases as temperature increases
20
It has 6 protons and 6 neutrons.
21
Chlorine
22
Soda ash
23
Mercury(II) chloride
24
It is a bond between different nonmetal atoms.
25
11 g
26
C4H10
27
37.65%
28
Solvent
29
Lower viscosity usually results in better solubility due to easier molecular movement
30
10.0 N
31
100 ppm
32
19.1 ppm
33
10.0 g
34
4.00 mol/L
35
6.81 m
36
0.125 L
37
100 ppm Zn, 75 ppm Cd, 50 ppm Pb
38
Electron pair acceptor
39
Milk of magnesia
40
13
41
10.5
42
Aqueous NaOH turns litmus paper blue, while NH4NO3 does not change litmus color.
43
Lose 3 electrons
44
Mg is the oxidizing agent
45
At the anode
46
They are reduced at the cathode to form metallic silver.
47
Copper (Cu)
48
About 1:1 cyclohexane : toluene (≈50% cyclohexane)
49
Volatile liquids should be weighed by first recording the mass of the empty vial with its cap.
50
Capacity
51
The burette was rinsed with water instead of HCl
52
Store the electrode in distilled water to keep the electrode bulb moist during storage
53
Collect the sample in a container made of material that will chemically react with the sample
54
Glass
55
Small amounts of solvent repeatedly
56
Buchner crucible
57
Short-stem funnel
58
Distillation
59
Milk and water
60
Boil the liquid and place the thermometer bulb in the refluxing vapor (so it reads the vapor temperature)
61
Overheating is still possible
62
It reduces decomposition of temperature-sensitive (heat-labile) compounds
63
Two miscible liquids
64
Provide surface area for vapors to condense
65
The number of theoretical plates in the column
66
2.0%
67
Q-test (Dixon's Q test)
68
High signal-to-noise ratio
69
Matrix
70
Primary standard
71
All of the above
72
Gravimetric analysis
73
Kjeldahl method
74
Conduct electric current, which is the reciprocal of resistivity
75
Increasing temperature has no effect on its value
76
All of the above
77
Liquid and gas only (II and III).
78
Liquids
79
Different compounds are adsorbed on an adsorbent to different degrees.
80
All of the above (spots of colorless compounds are invisible to the eyes; spots can be detected under UV light; spots can be detected by exposing the plate to iodine vapors).
81
Partition chromatography
82
Differential adsorption
83
Chlorophylls and carotenoids
84
Antibodies bound to a covalently attached antigen on a cellulose column
85
Cations
86
Adsorption
87
The more polar the solute, the more strongly it will be adsorbed on a polar surface.
88
Gas-solid chromatography
89
Purge and trap; Solid-phase microextraction (both I and II)
90
Chromatogram
91
Spectroscopic methods require less time and less amount of sample than classical methods.
92
Beer-Lambert's Law
93
Because A is proportional to the concentration of the analyte, whereas %T is not.
94
Calibration check
95
Beer-Lambert's law forms the quantitative basis for all types of absorption spectroscopy of an analyte.
96
Calibration curve
97
All of the above
98
They also absorb light in the UV-Visible region, interfering with the measurement
99
All of the above
100
The rate at which the concentration of reactants decreases or the concentration of products increases with time