Realgrades

Charles Coulomb - correct answer used the principles of calculus to determine the true position of the sliding surface in soil behind a retaining wall using the laws of friction and cohesion for solid bodies Henri Darcy - correct answer studied the permeability of sand filters and defined the term coefficient of permeability of soil Sir George Darwin - correct answer conducted lab tests...

Soil Mechanics - correct answer Application of static, mechanics of materials, and fluid mechanics to describe the behavior of soils Soil - correct answer Weathering rocks and minerals What are the differences between sand and clay? (size, shape, strength comes from __?) - correct answer Sand: larger/coarse grained, rounder, strength from frictional forces between particles Clay: small...

compaction and consolidation - correct answer Extrudes the water Compaction effects - correct answer Increase soil shear strength, decrease future settlement, decrease permeability By using the dry unit weight of soil - correct answer Calculate compaction Water for compaction - correct answer Acts as a Lubricant. Too much of it means lesser density....

What kind of engineering properties of the soils do you (i.e. a general contractor) need to have in order to design construction temporary work such as shoring for an excavation? (A) Shear strength (B) Permeability (C) Compressibility or characteristics of volume changes (D) Compactability (E) All of the above (F) None of the above - correct answer A What kind of engineering properties of the soils do you (i.e. a general contractor) need to have in o...

Geotechnical Engineer - correct answer civil engineer specializing in natural materials Rock - correct answer large mass of cemented mineral matter Soil - correct answer uncemented aggregate of minerals and organic matter with liquid and gas in voids Soil Mechanics - correct answer study of physical properties of soil and their behavior subjected to...

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Which is NOT true of the flame atomic absorbance spectroscopy of iron? A) The iron sample is aspirated into the flame, where the solvent evaporates and the iron analyte is atomized. B) The flame replaces the cuvet of conventional spectrometers and the flame pathlength is typically 10 cm. C) The hollow-cathode lamp for iron emits wavelengths of light unique for iron. D) The iron atoms in the flame absorb some of the light emitted from the hollow-cathode lamp. E) A detector measures the amo...

AAS - correct answer -Commonly used for elemental analysis -expose sample to flame or high temp -characteristics of flame impact use of AAS Flame AAS - correct answer -simplest atomization of gas/solution/solid -laminar flow burner - stable sheet of flame -flame atomization best for reproducibility -relatively insensitive - incomplete volatilization, short time in flame Different mixes and flow rates give different ...

Choose the right description for the experimental setup in a spectroscopic experiment using a sample of hydrogen gas atoms as an example. - correct answer Light with many wavelengths is shone on the hydrogen sample. A detector measures wavelengths of light which are absorbed or emitted by the hydrogen atoms. In the above experiment if only the absorbed wavelengths of light are detected what is the experiment called? What is the spectrum called? - correct ans...

Atomic Absorption Spectrophotometry (AAS) - correct answer atoms in the dissociated ground state can absorb radiation of a specific wavelength these un-ionized, un-excited ground state atoms in a flame will absorb - correct answer energy of a characteristic wavelength for that atom amount of light absorbed is proportional to the - correct answer concentration of substance being measured...

What does atomic absorption spectroscopy do? - correct answer - uses the absorption of light to measure the concentration of gas-phase atoms True or false: gas phase atoms and ions do not have vibrational or rotational states. - correct answer - true What do energy level diagrams (Grotrian diagrams) illustrate? - correct answer - they are plots of orbital energies - various possible at...

Atomic Absorption Spectrophotometry - correct answer A reference method for trace metals such as lead Atoms absorb - correct answer lines (single λs) of light and in so doing an electron is moved to a higher energy orbital The energy of the light absorbed equals - correct answer the energy difference between electron orbitals Light absorbed is directly proportional to - correct answ...

State the methods most commonly used in mineral analysis. - correct answer ICP-AES Define the abbreviations AAS, ICP-AES and ICP-MS. - correct answer AAS - Atomic Absorption Spectroscopy ICP-AES= Inductively coupled plasma- atomic emission spectroscopy ICP-MS- inductively coupled plasma-mass spectroscopy Explain how AAS and AES spectra are produced. - correct answer when ground s...

what are the uses of flame photometry - correct answer determines sodium, potassium, and lithium concentrations in biological fluids what is the principle of flame photometry - correct answer the intensity of the characteristic wavelength of radiant energy produced by the atoms in the flame is directly proportional to the number of atoms excited in the flame, which is directly proportional to the concentration is flame p...

which one is more temperature dependent: atomic absorption spectroscopy or atomic emission spectroscopy and why - correct answer atomic emission spectroscopy is dependent on the number of atoms in the excited state, so a fluctuation in temperature will change the signal, as the number of excited atoms changes with a change in temp. thus, the temp must be stable for atomic emission spectroscopy explain atomic absorption spectroscopy - correct answer ...

Application - correct answer - water quality analysis of groundwater samples -chemical analysis of rocks, oil stream sediment samples from exploration and mapping programs Extremely sensitive, and can detect minute amounts of analyte in sample. • Because of its sensitivity, sample preparation represent the most challenging aspect of its analytical methodology. • Operation and reporting requires good training that include safety. • Measure a...

What is Atomic Absorption used for? - correct answer Determination of metal residues from the manufacturing process in drugs What does atomic absorption spectrophotometry measure? - correct answer Absorbance of light by ground state atoms How does atomic absorption work? - correct answer Uses a light source of specific wavelength to cause the electron to be promoted to the excited state...

Atomic Absorption Spectroscopy - correct answer An analytical technique that uses light absorption to measure the concentration of a metal in a sample. Why would you use AAS over AES? - correct answer Many heavier atoms can not be thermally excited from the ground state due to the large amount of energy required, so AES would not be suitable How does AAS work? - correct answer - Radiati...

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Which of the following types of inventory exists due to quantity discounts, long production runs, and/or full vessel freight discounts? - correct answer Cycle stocks (batching economies) In order to totally eliminate stockouts (100% service level),how much inventory would you theoretically need? - correct answer infinite inventory The inventory classification approach that focuses on the SKUs (Stock Keeping Units) that h...