9. To prepare a 50 ml portion of 0.002M Na+ solution from a 0.01M what volume we need to take from the concentrated solution? a) 1.0 x 10¹ b) 2.5 x 10¹ c) 0.95 x 10¹¹ d) 1.0 x 10²
9. To prepare a 50 ml portion of 0.002M Na+ solution from a 0.01M what volume we need to take from the concentrated solution? a) 1.0 x 10¹ b) 2.5 x 10¹ c) 0.95 x 10¹¹ d) 1.0 x 10²
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Q9 and Q10 and Q11 pleeeeeeeeeease
Transcribed Image Text:6. A chromatographic solvent is used in the column as:
a) stationary phase
d) adsorbent phase
7. Sample portions of a material of the same size analyzed at the same
time and in the same way are called
a) Representative
b) Replicate c) Laboratory
d) Matrix
8. The correct wavelength range for infrared light is:
a) 180-380 cm
c) 780-2500 nm
b) mobile phase c) indicator
9. To prepare a 50 ml portion of 0.002M Na+ solution from a 0.01M what
volume we need to take from the concentrated solution?
a) 1.0 x 10¹
b) 2.5 x 10
c) 0.95 x 10¹
d) 1.0 x 10²
10. A 50.0 ml aliquot of 0.050 M NaCN is titrated with 0.10 M HCI. The
reaction is CN + H₂O == HCN + H₂O
K₂ = 6.2 x 10¹0
Calculate the pH after the addition of 26.00 ml HCI.
b) 10.95
a) Solid, liquid
b) Liquid liquid
c) Liquid, gas
d) Solid, gas
b) 380-780 nm
d) 650-4000 cm
a) 5.34
c) 9.38
11. The suitable source for Vis/near IR molecular absorption is:
a) Globar b) Tungsten lamp c) Xenon lamp d) Halogen lamp
12. In Column chromatography, the stationary phase is made of
and the mobile phase is made of
a) Solid, liquid
b) Liquid, liquid
c) Liquid, gas
d) Solid, gas
13. In Gas chromatography, the stationary phase is made of
and the mobile phase is made of
d) 2.88
14. The main components of the optical spectroscopy when configured as:
3)sample 1)source, 2)wavelength selector, 4)detector, 5)readout is for
one of the following types:
a) absorption b) fluorescence c) emission d) none of these
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