Chemical Context of Life: Matter, Elements, and Compounds
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Questions and Answers

What is an element in chemistry?

  • A substance with characteristics different from those of its elements
  • A substance that cannot be broken down to other substances by chemical reactions (correct)
  • A substance consisting of two or more elements in a fixed ratio
  • A substance that can be broken down to other substances by chemical reactions

    • How many elements are essential to life?

  • 50
  • 10
  • 25 (correct)
  • 94

    • What are trace elements in the context of organisms?

  • Elements that are not required by an organism
  • Elements required by an organism in large quantities
  • Elements that consist of more than one element
  • Elements required by an organism in minute quantities (correct)

    • What is a compound in chemistry?

    <p>A substance that can be broken down to other substances by chemical reactions</p> Signup and view all the answers

    What is the smallest unit of matter that retains the properties of an element?

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

    Which subatomic particles form the atomic nucleus?

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

    What are isotopes?

    <p>Different atomic forms of an element with varying numbers of protons and neutrons</p> Signup and view all the answers

    What is the process by which radioactive isotopes decay spontaneously, giving off particles and energy?

    <p>Radioactive decay</p> Signup and view all the answers

    What is a molecule?

    <p>Two or more atoms held together by covalent bonds</p> Signup and view all the answers

    What type of chemical bond involves the sharing of one or more pairs of valence electrons by two atoms?

    <p>Covalent bond</p> Signup and view all the answers

    What is potential energy?

    <p>The energy that matter has because of its location or structure</p> Signup and view all the answers

    "An attraction between 2 atoms, resulting from a sharing of outer-shell electrons or the presence of opposite charges on the atoms" refers to what?

    <p>&quot;Chemical bond&quot;</p> Signup and view all the answers

    "Electronegativity" is defined as what?

    <p>'An atom’s attraction for the electrons in a covalent bond'</p> Signup and view all the answers

    "Carbon isotopes" are different atomic forms of carbon that have the same number of protons but differ in what?

    <p>'Number of neutrons'</p> Signup and view all the answers

    "Metan (CH4)" is an example of what?

    <p>'A compound'</p> Signup and view all the answers

    What are some applications of radioactive isotopes?

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

    Which of the following statements best describes an essential element?

    <p>An element that is required by an organism to survive, grow, and reproduce</p> Signup and view all the answers

    What distinguishes a compound from its constituent elements?

    <p>Compounds have characteristics different from those of their constituent elements</p> Signup and view all the answers

    How many of the 94 elements are essential to life?

    <p>Approximately 25</p> Signup and view all the answers

    What are trace elements in the context of organisms?

    <p>Elements that are required by an organism in minute quantities</p> Signup and view all the answers

    In the context of chemistry, what does it mean for an element to be 'essential'?

    <p>It cannot be replaced by any other chemical element</p> Signup and view all the answers

    What term refers to the smallest unit of matter that still retains the properties of an element?

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

    Which type of chemical bond involves the sharing of one or more pairs of valence electrons by two atoms?

    <p>Covalent bond</p> Signup and view all the answers

    What analogy is used to describe the energy levels of electrons in an atom?

    <p>A ball bouncing down a flight of stairs</p> Signup and view all the answers

    What is defined as an element’s attraction for the electrons in a covalent bond?

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

    Which subatomic particles form the atomic nucleus?

    <p>Neutrons and protons</p> Signup and view all the answers

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