Introduction to Matter and Elements
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Questions and Answers

What is the definition of an element?

  • A substance that cannot be broken down to other substances by chemical reactions (correct)
  • A substance consisting of two or more different elements combined in a fixed ratio
  • A substance that can be broken down into other substances by chemical reactions
  • A substance that forms when two atoms share a pair of valence electrons

What do trace elements refer to?

  • Elements required by an organism in minute quantities (correct)
  • Elements that are toxic to living organisms
  • Elements that are required by an organism in large quantities
  • Elements that are not important for the survival of organisms

In an ionic bond, what happens between two atoms?

  • They form weak chemical interactions
  • One atom strips an electron away from the other (correct)
  • They share a pair of valence electrons
  • They equally share electrons in a covalent bond

What is the definition of atomic mass?

<p>The total mass of an atom, which is the sum of protons and neutrons (D)</p> Signup and view all the answers

What does the term isotopes refer to?

<p>Atoms that share the same atomic number but different mass numbers (D)</p> Signup and view all the answers

What is the main difference between hydrogen bonds and van der Waals forces?

<p>Hydrogen bonds involve a partial positive hydrogen and a partial negative EN atom, while van der Waals forces involve instantaneous dipoles due to moving electrons. (D)</p> Signup and view all the answers

How does molecular shape impact biological molecules' interactions?

<p>Molecular shape affects how biological molecules recognize and respond to each other with specificity. (A)</p> Signup and view all the answers

What is the role of cohesive properties of water in plants?

<p>Cohesion allows water to flow uphill in plants against gravity. (B)</p> Signup and view all the answers

In chemical equilibrium, what remains constant?

<p>Reactants and products remain constant in concentration. (D)</p> Signup and view all the answers

How do the emergent properties of water contribute to Earth's suitability for life?

<p>Water's cohesion and adhesion properties support ecosystems by allowing transport of nutrients against gravity. (B)</p> Signup and view all the answers

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