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Questions and Answers
How many tungsten atoms are contained in a jewelry piece with a diameter of 12.3mm?
How many tungsten atoms are contained in a jewelry piece with a diameter of 12.3mm?
- 2.08 x 1027 atoms
- 4.92 x 1023 atoms (correct)
- 6.14 x 1022 atoms
- 1.66 x 1028 atoms
What is the density of acetone in g/cm3?
What is the density of acetone in g/cm3?
- 7.91 x 10-4 g/cm3
- 7.91 x 10-1 g/cm3 (correct)
- 7.91 x 107 g/cm3
- 7.91 x 103 g/cm3
Which species does NOT have the same number of neutrons as 31P3-?
Which species does NOT have the same number of neutrons as 31P3-?
- 35K+ (correct)
- 31P
- 34Ar
- 29Si
What is the correct number of significant figures for the result of 114.mL – 7.× 101 mL?
What is the correct number of significant figures for the result of 114.mL – 7.× 101 mL?
How is the ordering of energy levels for GS, ES-A, and ES-B arranged from lowest energy to highest energy?
How is the ordering of energy levels for GS, ES-A, and ES-B arranged from lowest energy to highest energy?
Which statement about a pure nickel sphere and a pure silver sphere with identical volumes is true?
Which statement about a pure nickel sphere and a pure silver sphere with identical volumes is true?
What is the volume of a sphere with a diameter of 12.3 mm?
What is the volume of a sphere with a diameter of 12.3 mm?
Which molecule transitions first from ground state to excited electronic state before emitting light at 510 nm?
Which molecule transitions first from ground state to excited electronic state before emitting light at 510 nm?
What changes when 12C is replaced by 13C in a molecule?
What changes when 12C is replaced by 13C in a molecule?
Which electronic transition in a hydrogen atom emits a photon with sufficient frequency to activate a specific molecular switch?
Which electronic transition in a hydrogen atom emits a photon with sufficient frequency to activate a specific molecular switch?
What is the mass of a mole of electrons in g/mol?
What is the mass of a mole of electrons in g/mol?
Which quantity is NOT dependent on the wavelength of a photon of light?
Which quantity is NOT dependent on the wavelength of a photon of light?
Which element could have an atom mass of 5.148 x 10-23 g?
Which element could have an atom mass of 5.148 x 10-23 g?
Which sample consists of the greatest number of atoms?
Which sample consists of the greatest number of atoms?
How should the average atomic mass of magnesium be estimated from its isotopes' abundances?
How should the average atomic mass of magnesium be estimated from its isotopes' abundances?
What is the mass of water lost from the sample after drying, reported with the correct number of significant figures?
What is the mass of water lost from the sample after drying, reported with the correct number of significant figures?
In what way does the stability of an electron in the n = 1 state of a hydrogen atom differ from when it is in the n = 2 state?
In what way does the stability of an electron in the n = 1 state of a hydrogen atom differ from when it is in the n = 2 state?
What does the value 10.81 on the periodic table for Boron represent?
What does the value 10.81 on the periodic table for Boron represent?
When converting the first ionization energy of Scandium from J/atom to kJ/mol, what is the correct conversion result?
When converting the first ionization energy of Scandium from J/atom to kJ/mol, what is the correct conversion result?
What scientific principle is demonstrated by diffraction patterns emerging from a beam of electrons passing through two slits?
What scientific principle is demonstrated by diffraction patterns emerging from a beam of electrons passing through two slits?
Which statement about the addition of Zinc as a micronutrient in commercially produced foods is accurate?
Which statement about the addition of Zinc as a micronutrient in commercially produced foods is accurate?
How does the energy of an electron in a hydrogen atom change with an increase in principal quantum number (n)?
How does the energy of an electron in a hydrogen atom change with an increase in principal quantum number (n)?
What is the significance of the value 10.81 listed for Boron in the periodic table?
What is the significance of the value 10.81 listed for Boron in the periodic table?
What is the recommended daily value of zinc, in mg?
What is the recommended daily value of zinc, in mg?
If the volume of a cell is approximately $1.0 imes 10^3 , ext{μm}^3$, what is the typical volume of the cell nucleus assuming it is about 10% of the total cell volume?
If the volume of a cell is approximately $1.0 imes 10^3 , ext{μm}^3$, what is the typical volume of the cell nucleus assuming it is about 10% of the total cell volume?
What is the density of DNA in g/cm³?
What is the density of DNA in g/cm³?
Why does the number density of Titanium (Ti) remain lower than that of Beryllium (Be) despite Ti having a higher density?
Why does the number density of Titanium (Ti) remain lower than that of Beryllium (Be) despite Ti having a higher density?
What is the mass of DNA inside a typical cell nucleus in grams?
What is the mass of DNA inside a typical cell nucleus in grams?
What is the wavelength of the photon emitted during the electronic transition in the hydrogen atom?
What is the wavelength of the photon emitted during the electronic transition in the hydrogen atom?
If the number density of Silicon (Si) is to be calculated as atoms per cm³, which of the following must be known?
If the number density of Silicon (Si) is to be calculated as atoms per cm³, which of the following must be known?
If an electronic transition in hydrogen moves from n = 5 to a lower state, what factor could determine the new quantum state?
If an electronic transition in hydrogen moves from n = 5 to a lower state, what factor could determine the new quantum state?
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Study Notes
Practice Exam 1 Overview
- The exam tests various fundamental concepts in General Chemistry.
- Key topics include density conversions, atomic structure, molecular transitions, and isotopes.
Density and Conversions
- Acetone density: 791 kg/m³ converts to 0.791 g/cm³.
- Tungsten density: 19.25 g/cm³; volume formula V = (4/3)πr³ helps find the number of atoms in a jewelry piece.
- Loss of water mass during drying reviewed: Initial and final masses reported affect significant figure calculations.
Atomic Structure and Isotopes
- Isotopes display different neutron counts compared to standard elements: 31P³⁻ compared with other elements like K⁺ and Si.
- Isotopic labeling used in molecular studies; substitution of 13C for 12C changes neutron count but retains proton and electron totals.
Electronic Transitions and Energy States
- Green Fluorescent Protein (GFP) absorbs light at 395 nm, transitioning from ground state (GS) to excited states (ES-A, ES-B). Energy hierarchy: GS < ES-A < ES-B.
- Hydrogen atom transitions include various energy states; transitions n = 2 to n = 1 are significant for high-frequency photon emissions.
Calculations and Formula Applications
- Conversion of electron mass (9.11 x 10^-31 kg) to molar mass yields 5.49 x 10^-4 g/mol.
- Average atomic mass calculations for elements consider percent natural abundances, applied to Magnesium's isotopes.
Significant Figures and Empirical Measurements
- Performing calculations with significant figures is crucial, especially in volume and mass differences.
- Specific density and mass allow comparison of atomic number densities among elements like Be, Si, and Ti.
Micronutrient Content
- Zinc daily value calculated from cereal content illustrates the importance of nutrient labeling.
Work-Out Problems
- Density and volume calculations for nucleic DNA provide practical applications of density formulas and significant figures.
- Electronic transitions in hydrogen can be used to infer higher frequency transitions through wavelength calculations.
General Observations
- Understanding fundamental principles of chemistry is essential for solving practical problems.
- Mastery of significant figures, density, isotopes, and atomic structure is critical for exam preparation.
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