Matter Composition and Chemical Reactions Quiz
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Questions and Answers

What is the Law of Definite Composition also known as?

  • Law of Mass Conservation
  • Atomic Number Law
  • Law of Conservation of Energy
  • Law of Multiple Proportions (correct)

    • How is mass defined in chemistry contexts?

  • Anything that occupies space (correct)
  • Anything that has volume and density
  • Anything with protons and neutrons
  • Anything with weight and size

    • What does the Atomic Number of an element represent?

  • Number of electrons orbiting around the nucleus
  • Number of protons + neutrons
  • Number of electrons in the nucleus
  • Number of protons in the nucleus (correct)

    • What does the term 'Mole' refer to in chemistry?

    <p>A quantity of a given substance with a fixed mass</p> Signup and view all the answers

    How is 'Molar Mass' defined in relation to a substance?

    <p>The mass of one mole of a substance</p> Signup and view all the answers

    What is a 'Compound' defined as in chemistry?

    <p>A substance composed of different elements chemically bonded together</p> Signup and view all the answers

    What is the term for a substance with a fixed composition?

    <p>Pure substance</p> Signup and view all the answers

    What is the term for a group of atoms that are chemically bonded together?

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

    What is the term for an electrically-charged particle obtained from an atom or chemically bonded group of atoms?

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

    What is the ratio of the actual yield to the theoretical yield, multiplied by 100%?

    <p>Percentage yield</p> Signup and view all the answers

    What is the sum of the atomic masses/weights of all the atoms in a molecule?

    <p>Molecular weight</p> Signup and view all the answers

    What is the formula that uses atomic symbols with numerical subscripts to convey the relative proportions of atoms of the different elements in the substance?

    <p>Chemical formula</p> Signup and view all the answers

    What is the general formula for an alkene?

    <p>R-C=C-R'</p> Signup and view all the answers

    What is the name of the functional group R-COOH?

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

    What is the formula for methyl cyanide?

    <p>CH3-CN</p> Signup and view all the answers

    What is the symbol of the element with atomic number 11?

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

    What is the formula for Bromoethane?

    <p>CH3-CH2Br</p> Signup and view all the answers

    What is the name of the element with atomic number 30?

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

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