Chemistry Concepts and Calculations
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Questions and Answers

What is the correct frequency of red light produced from strontium salts when the wavelength is 6.50 x 10⁻⁷ m?

  • 6.15 x 10¹⁴ Hz
  • 2.09 x 10¹⁴ Hz
  • 3.12 x 10¹⁴ Hz
  • 4.62 x 10¹⁴ Hz (correct)

    • Calculate the wavelength of an electromagnetic wave given its frequency of 4.80 x 10¹⁰ Hz.

  • 6.25 x 10⁻³ m (correct)
  • 7.50 x 10⁻² m
  • 5.00 x 10⁻² m
  • 8.33 x 10⁻³ m

    • What is the energy of a gamma-ray photon with a frequency of 5.02 x 10²⁰ Hz?

  • 3.33 x 10⁻¹³ J (correct)
  • 4.12 x 10⁻¹³ J
  • 5.00 x 10⁻¹³ J
  • 2.45 x 10⁻¹³ J

    • Which notation represents the full electron configuration for Silicon?

    <p>1s22s22p63s23p2</p> Signup and view all the answers

    According to Hund's Rule, how should electrons be filled in degenerate orbitals?

    <p>Electrons fill empty orbitals singly before pairing up.</p> Signup and view all the answers

    Which of the following compounds has a covalent bond between its constituent atoms?

    <p>Carbon tetrabromide (CBr₄)</p> Signup and view all the answers

    What is the correct name for the ionic compound represented by the formula ZnF₂?

    <p>Zinc fluoride</p> Signup and view all the answers

    Which of the following correctly describes the nature of an ion?

    <p>An atom or molecule with a net positive or negative charge</p> Signup and view all the answers

    In the given incomplete chemical equation, what type of reaction might it represent?

    <p>Double displacement</p> Signup and view all the answers

    What is the correct formula for dinitrogen tetroxide?

    <p>N₂O₄</p> Signup and view all the answers

    Which element is indicated by the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1?

    <p>Gallium (Ga)</p> Signup and view all the answers

    What is the bond angle associated with a trigonal planar VSEPR shape?

    <p>120°</p> Signup and view all the answers

    Which of the following elements is least likely to form an ionic bond with Calcium (Ca)?

    <p>Oxygen (O)</p> Signup and view all the answers

    In the Lewis dot structure for Sodium Chloride (NaCl), how many dots will be around the Chlorine atom?

    <p>8</p> Signup and view all the answers

    Which of the following Lewis dot structures correctly represents Magnesium Bromide (MgBr₂)?

    <p>Mg with no dots and 2 Br with 8 dots each</p> Signup and view all the answers

    Which statement correctly differentiates an atom from an isotope?

    <p>An atom is a particle that constitutes matter, whereas an isotope has a different mass number but the same elemental identity.</p> Signup and view all the answers

    Among the following, which element is characterized by a higher electronegativity?

    <p>Oxygen</p> Signup and view all the answers

    Which isotope is expected to contain the largest number of neutrons?

    <p>Uranium-235</p> Signup and view all the answers

    What is the calculated atomic mass of strontium based on its isotopes?

    <p>87.71 amu</p> Signup and view all the answers

    Which of the following elements is expected to exhibit metallic properties more significantly?

    <p>Potassium</p> Signup and view all the answers

    Which of the following best describes a decomposition reaction?

    <p>A single substance breaks down into two or more products.</p> Signup and view all the answers

    What is the main product when $C_2H_4O_2$ combusts with $O_2$?

    <p>Water (H2O)</p> Signup and view all the answers

    How many significant figures are in the measurement 0.00056?

    <p>2</p> Signup and view all the answers

    When converting 20 inches to feet, what is the correct answer based on significant figures?

    <p>1.67 feet</p> Signup and view all the answers

    What is Avogadro's number, and why is it significant in chemistry?

    <p>6.022 x 10^23; it counts the number of particles in one mole.</p> Signup and view all the answers

    What is the physical state of bromine at room temperature?

    <p>Liquid</p> Signup and view all the answers

    What is the density of the irregular shaped object measured in the lab?

    <p>1.86 g/mL</p> Signup and view all the answers

    Which atomic model is associated with JJ Thomson?

    <p>Plum Pudding model</p> Signup and view all the answers

    Which scientist is best known for the oil drop experiment?

    <p>Robert Millikan</p> Signup and view all the answers

    What is the physical state of helium at room temperature?

    <p>Gas</p> Signup and view all the answers

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