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Go to: Midterm II | Final Exam
Geochemistry (GLGY 323-UCAL) Midterm I
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Question 1 |
A | Construction of the history of rocks, fossils and sediments based on relative depositional sequences. |
B | Dating of rocks, fossils and sediments based on radiometric dating, paleomagnetic references and other techniques. |
C | None of the listed answers are correct. |
D | Construction of the history of rocks exclusively based on Pb-207/U-235 dating technique. |
E | Dating of rocks, fossils and sediments based on chronological sequence of sedimentation and lithification. |
Question 2 |
A | Elements that preferentially partition into silicate phase. |
B | Elements that preferentially partition into metallic phase. |
C | Elements that preferentially partition into gas phase. |
D | Elements that preferentially partition into sulfur bearing phase. |
Question 3 |
A | Ionic radii decreases with increasing CN. |
B | Larger cations have a higher CN. |
C | Electrostatic valency is directly proportional to CN. |
D | CN is a measure of number of electrons surrounding a nucleus. |
Question 4 |
A | Isotopes are unstable states of chemical elements while isobars are regions where these unstable elements are found. |
B | Isotopes have the same atomic number but different atomic mass, while isobars have the same atomic mass, but different atomic number. |
C | An isobar is a particular nuclide of an element that has a specific number of neutrons, and thus, a specific mass. An isotope refers to all of the nuclides of all elements that have a particular atomic mass. |
D | Isobars are atoms of the same element in different state or configuration while isotopes are completely different elements that share several common atomic properties. |
E | Isotopes have the same atomic mass but different atomic number, while isobars have the same atomic number but different atomic mass. |
Question 5 |
A | Differences in spin ratios of sub-atomic particles. |
B | Depletion of matter. |
C | Energy loss. |
D | Atomic decay. |
Question 6 |
A | the net reaction will result in grain of energy; change in enthalpy. |
B | the equilibrium for the chemical reaction lies with the reactants |
C | the equilibrium for the chemical reaction lies with the products |
D | the net reaction will result in release of energy; change in enthalpy. |
Question 7 |
A | isotopes. |
B | Elements lighter than Na. |
C | trace elements. |
D | major and minor elements. |
Question 8 |
A | one , with lowest energy |
B | six , at an angle |
C | one , at an angle |
D | two , with lowest energy |
E | three , at an angle |
Question 9 |
-Solid samples must be prepared by making them into a finely grounded rock powder pressed into pellets.
-Low detection limits (can measure trace elements)
-Rapid and precise analytical technique.
-Elements lighter than Na cannot be analyzed.
A | X-ray Florescence (XRF) |
B | Electron Microprobe Analysis (EPMA) |
C | Instrumental Neutron Activation Analysis (INAA) |
D | Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES) |
E | Atomic Absorption Spectrophotometry (AAS) |
Question 10 |
A | Chemical state is at equilibrium |
B | Not enough information is provided to answer this question. |
C | Mineral dissolves |
D | Solution is supersaturated |
E | Mineral precipitates |
Question 11 |
A | Low temperature and high pressure |
B | Low temperature and low pressure |
C | High temperature and high pressure |
D | None of the answers are correct |
E | High temperature and low pressure |
Question 12 |
A | Detection of different types of isotopes. |
B | Source for the ionic mass. |
C | Acceleration of the ions through the analyzing chamber. |
D | Separation of isotopes based on the mass. |
Question 13 |
A | Mafic to felsic |
B | Silicon poor |
C | Rich in high density rocks and minerals |
D | Ultramafic |
E | Mafic to ultramafic |
Question 14 |
A | JMS |
B | ICP-MS |
C | TIMS |
D | XRF-MS |
E | SIMS |
Question 15 |
A | atomic number , charge |
B | atomic number , size of the atom |
C | charge , cation |
D | charge , atomic number |
E | radius , cation |
Question 16 |
A | High amount of internal energy in the products. |
B | A negative change enthapy. |
C | Increased of net internal energy. |
D | A positive change enthapy |
Question 17 |
A | By analyzing the sample taken from the core. |
B | From the samples from kimberlite pipes. |
C | By analyzing the magma composition from different volcanoes. |
D | Unique seismic signature associated with high density materials. |
E | Based on the chemical composition of rocks on the surface. |
Question 18 |
A | Centrifugal force caused by the rotation of the Earth. |
B | Separation of metals from silicates. |
C | Density variation between the silicon core and the magma ocean above. |
D | Magnetic force. |
E | Change in temperature in the magma chamber. |
Question 19 |
A | Sample must be in solution. |
B | ASS is a non-destructive analytical method. |
C | Similar to XRF, except the sample is excited by a beam of electrons. |
D | Samples must be vacuum chamber compatible. |
E | Several elements can be analyzed at a time. |
Question 20 |
A | Ability to obtain comprehensive analytical data within a very short time period. |
B | Can used to ionize almost any element in nature. |
C | No sample preparation is required for analysis. |
D | Very high spatial resolution. |
E | Ability to ionize and evaporate samples at different temperatures at the same time. |
Question 21 |
A | Principle Quantum Number |
B | Spin Quantum Number |
C | Magnetic Quantum Number |
D | Azimuthal Quantum Number |
Question 22 |
A | Elements that preferentially partition into gas phase. |
B | Elements that preferentially partition into silicate phase. |
C | Elements that preferentially partition into metallic phase. |
D | Elements that preferentially partition into sulfur bearing phase. |
Question 23 |
A | amount of energy , change in internal energy |
B | amount of heat it contains , decreasing internal energy |
C | None of the answers are correct. |
D | external factors , change in internal energy |
E | stability of atoms , increasing in internal energy |
Question 24 |
A | Oceanic crust formation. |
B | Convergent boundaries. |
C | Strike-slip earthquakes. |
D | Subduction zones. |
E | Liquefaction. |
Question 25 |
A | Mantel |
B | Subduction zones |
C | Archean cratons |
D | Hydrothermal mineral deposits |
E | Ore deposits |
Question 26 |
A | Elements that preferentially partition into metallic phase. |
B | Elements that preferentially partition into gas phase. |
C | Elements that preferentially partition into silicate phase. |
D | Elements that preferentially partition into sulfur bearing phase. |
Question 27 |
A | Orthopyroxene and Olivine |
B | Orthopyroxene, Clinopyroxene and Olivine |
C | Orthopyroxene, Clinopyroxene and Quartz |
D | Clinopyroxene and Quartz |
E | Orthopyroxene, Olivine and Quartz |
Question 28 |
A | covalent bonds |
B | small atomic numbers |
C | high electronegativity |
D | large atomic numbers |
E | low electronegativity |
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Credits: Based on the excellent class notes provided by, Dr. Rajeev Nair during Winter 2017 and textbook ISBN-978-1-444-35095-1.
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