Chemistry Basics Quiz
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Chemistry Basics Quiz

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Questions and Answers

What distinguishes an element from a compound?

  • Elements cannot be broken down into simpler substances. (correct)
  • Compounds can be separated by physical means.
  • Compounds have fixed proportions of their constituent elements. (correct)
  • Elements contain two or more types of atoms.

    • Which statement is true for mixtures?

  • Mixtures are not made of different substances.
  • Mixtures can only be separated chemically.
  • Mixtures have a fixed composition.
  • The composition of a mixture may vary. (correct)

    • Which of the following is an example of a compound?

  • Hydrogen (H2)
  • Oxygen (O2)
  • Gold (Au)
  • Sodium hydroxide (NaOH) (correct)

    • Which of the following elements is represented by the symbol 'K'?

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

    What is indicated by a material having a fixed composition?

    <p>It is a substance.</p> Signup and view all the answers

    What is the characteristic of solids that differentiates them from liquids and gases?

    <p>Solids have a fixed shape.</p> Signup and view all the answers

    What is the name of Al2O3?

    <p>Aluminium oxide</p> Signup and view all the answers

    How do chemists represent elements?

    <p>Using one or two-letter chemical symbols.</p> Signup and view all the answers

    In which state do particles have very little energy and are tightly packed together?

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

    Which of the following acids contains sulfur?

    <p>Sulfuric acid</p> Signup and view all the answers

    What characterizes a nonmetal at room temperature?

    Signup and view all the answers

    Which of the following formulas represents a base?

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

    Which group of elements shows a vigorous reaction with water?

    <p>Group I</p> Signup and view all the answers

    What type of mixture has a uniform composition throughout?

    <p>Homogeneous mixture</p> Signup and view all the answers

    Which of the following best describes a mixture?

    <p>A combination of two or more pure substances</p> Signup and view all the answers

    What is the center of an atom called, which contains protons and neutrons?

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

    During the process of balancing chemical equations, which of the following is an indication that a reaction has occurred?

    <p>All of the above</p> Signup and view all the answers

    What is ionization energy?

    <p>The energy required to remove one mole of electrons from one mole of isolated gaseous atoms or ions</p> Signup and view all the answers

    What phase change occurs when a solid turns directly into a gas?

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

    What trend occurs in melting points as you move down Group VII?

    <p>Melting points increase</p> Signup and view all the answers

    Which type of oxides forms acidic solutions when reacting with water?

    <p>Some nonmetallic oxides</p> Signup and view all the answers

    Which element is considered the strongest oxidizing agent in Group VII?

    <p>F2</p> Signup and view all the answers

    What pattern is observed in the conductivity of Period 3 elements?

    <p>Metals are good conductors, metalloids are semiconductors, and nonmetals are insulators</p> Signup and view all the answers

    Which reaction demonstrates the formation of a basic solution with a metallic oxide?

    <p>MgO + H2O → Mg(OH)2</p> Signup and view all the answers

    What general trend is observed in the reactivity of Group I elements?

    <p>Reactivity increases down the group</p> Signup and view all the answers

    What defines the charge of an atom?

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

    Which of the following describes isotopes?

    <p>Atoms with the same number of protons but different mass numbers</p> Signup and view all the answers

    What happens to an atom when it gains electrons?

    <p>It becomes a negative ion</p> Signup and view all the answers

    Which property is characteristic of metals according to the periodic table?

    <p>Good conductors of heat</p> Signup and view all the answers

    When an atom loses electrons, what type of ion does it become?

    <p>Positive ion</p> Signup and view all the answers

    Which of these elements is classified as a noble gas?

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

    In terms of periodic trends, what is the meaning of electron affinity?

    <p>Energy change when an electron is added to a neutral atom</p> Signup and view all the answers

    What does the atomic mass of an isotope represent?

    <p>Sum of protons and neutrons</p> Signup and view all the answers

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