Chemistry 1A 1021SCG Lecture Week Two Quiz
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Questions and Answers

What is the SI base unit for the expression 0.0123 mg?

  • 0.0123 g
  • 0.0000000123 g (correct)
  • 0.0000123 g
  • 0.000000123 g

    • Express 0.0123 μg to mg.

  • 0.000123 mg
  • 0.0123 mg
  • 0.123 mg
  • 0.0000123 mg (correct)

    • What is the result of the expression $1.2 + 0.55 - 0.504$ when rounded to the proper number of significant figures?

  • 1.247
  • 1.25 (correct)
  • 1.246
  • 1.251

    • Which scientist is known for the Law of Conservation of Mass?

    <p>Antoine Lavoisier</p> Signup and view all the answers

    What does the Law of Definite Proportions state?

    <p>Elements combine in fixed proportions by mass.</p> Signup and view all the answers

    What is the structure of an atom comprised of?

    <p>Central positively charged nucleus and surrounding negatively charged electrons</p> Signup and view all the answers

    What makes atoms different?

    <p>The number of protons in the nucleus</p> Signup and view all the answers

    Why is the atomic mass in the periodic table not in whole numbers?

    <p>Due to the presence of isotopes</p> Signup and view all the answers

    What is the molecular mass of (NH4)2SO4?

    <p>232.08 amu</p> Signup and view all the answers

    Which element has the atomic number Z=6?

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

    What does the mass number A represent?

    <p>The number of protons plus neutrons in the nucleus</p> Signup and view all the answers

    Why do elements within the periodic table exhibit regularities in chemical and physical properties?

    <p>Due to their electronic structure</p> Signup and view all the answers

    What is the average atomic mass of Carbon considering its isotopes?

    <p>12.01 amu</p> Signup and view all the answers

    In a neutral atom, what is equal to the number of protons in the nucleus?

    <p>The number of electrons in the nucleus</p> Signup and view all the answers

    "Isotopes" refer to atoms that differ in:

    <p>$Z$ and $A$ numbers</p> Signup and view all the answers

    "Molecular mass" refers to:

    <p>The sum of the atomic masses of each element in a molecule</p> Signup and view all the answers

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