Chemistry Fundamentals: Avogadro's Number and Branches
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Questions and Answers

What is Avogadro's number?

  • The average of atomic masses of all the isotopes of an element.
  • The branch of science which deals with the structure of matter, composition of matter, changes of matter and law and principle which govern these changes.
  • The formula mass of an ionic substance expressed in gram.
  • The number of atoms, molecules, formula units or ions present in one mole of the element, a compound or an ionic substance. (correct)

    • What is physical chemistry?

  • The branch of chemistry that deals with the properties and reactions of organic compounds.
  • The branch of chemistry that deals with the applications of chemical principles to medical sciences.
  • One of the major branches of chemistry that deals with the physical principles underlying chemical reactions and transformations. (correct)
  • The branch of chemistry that deals with the structure of matter, composition of matter, and changes of matter.

    • What is empirical formula?

  • The formula mass of an ionic substance expressed in gram.
  • The atomic mass of an element expressed in grams.
  • The formula of a substance which gives the exact number of atoms of each element present in the molecule of a substance.
  • The formula of a substance which gives the simple ratio of the elements present in the molecule of a substance. (correct)

    • What is a gram atom of an element?

    <p>The atomic mass of an element expressed in grams.</p> Signup and view all the answers

    What is a heteronuclear diatomic molecule?

    <p>A molecule consisting of two atoms of different elements.</p> Signup and view all the answers

    What is a homonuclear diatomic molecule?

    <p>A molecule consisting of two atoms of the same element.</p> Signup and view all the answers

    What percentage of the universe is made up of plasma?

    <p>99%</p> Signup and view all the answers

    Who identified plasma in 1979?

    <p>William Crooker</p> Signup and view all the answers

    What is the unit of the gas constant in the general gas equation?

    <p>J/mol·K</p> Signup and view all the answers

    What is the equation for the density of an ideal gas?

    <p>d = RT</p> Signup and view all the answers

    According to Dalton's Law of Partial Pressures, what is the expression for PA?

    <p>XA Pt</p> Signup and view all the answers

    What is the equation for the compressibility factor of a gas?

    <p>Z = PV/RT</p> Signup and view all the answers

    What is the term for atoms of the same element that have the same atomic number but different mass numbers?

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

    What is the technique used to separate gas molecules based on their mass to charge ratio?

    <p>Mass Spectrometry</p> Signup and view all the answers

    What type of motion do particles of a solid exhibit?

    <p>To and fro motion</p> Signup and view all the answers

    What is the term for molecules with high molar masses, usually more than 10,000?

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

    What is the characteristic of interfacial angles of a crystal?

    <p>They are always the same irrespective of the size of the crystal</p> Signup and view all the answers

    What is the graphical representation of the masses and relative abundances of molecular ions and positively charged fragments?

    <p>Mass Spectrum</p> Signup and view all the answers

    What is the term used to describe the phenomenon where a substance exhibits different physical properties in different directions?

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

    What is the term used to describe the phenomenon where an element exists in different physical forms?

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

    What is the term for atoms that have the same number of neutrons?

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

    What is the volume of one mole of an ideal gas at standard temperature and pressure?

    <p>22.414 dm3</p> Signup and view all the answers

    What is the minimum information required to define a unit cell?

    <p>Six unit cell dimensions</p> Signup and view all the answers

    What is the characteristic of the bonds in ionic solids?

    <p>Non-directional</p> Signup and view all the answers

    What is the vacant space in a crystal structure due to the circular shape of atoms and molecules called?

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

    Which phenomenon occurs when two different substances exist in the same crystalline form?

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

    What are the dimensions and angles of a unit cell called?

    <p>Lattice Constants</p> Signup and view all the answers

    What is the energy released when one mole of an ionic crystal is formed from gaseous ions?

    <p>Lattice Energy</p> Signup and view all the answers

    What is the property of metals that allows them to be converted into thin sheets?

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

    What is the force of attraction that binds positive metal ions due to the presence of free electrons?

    <p>Metallic Bonds</p> Signup and view all the answers

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