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Atoms and compounds

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  • Which of the following is a mixture?
    Water (H₂O)
    Carbon Dioxide (CO₂)
    Salt (NaCl)
    Air
  • Explain the difference between an element and a compound.
    An element is made up of only one type of atom, while a compound is made up of two or more different types of atoms chemically bonded together.
  • In the periodic table, rows are called:
    Periods
    Groups
    Levels
    Series
  • How can mixtures be separated?
    Through oxidation
    Chemically
    Using physical means
    By bonding atoms
  • In compounds, metals usually come first in the name.
    True
  • Compounds have the same properties as the elements that make them.
    False
  • What are the particles located in the nucleus of an atom?
    Protons and neutrons
    Electrons
    Protons and electrons
    Neutrons and electrons
  • What type of bond forms compounds?
    Mixing of elements
    Physical bonding
    Magnetic attraction
    Sharing or transferring electrons
  • A __________ is a shorthand way to represent elements.
    Symbol
  • Atoms are the smallest unit of a compound.
    False
  • Air is a compound made of gases.
    False
  • What is the smallest piece of matter?
    Atom
    Element
    Compound
    Molecule
  • An electron has a positive charge.
    False
  • Which model describes atoms as tiny indestructible spheres?
    Periodic Table Model
    Nuclear Model
    Solid Sphere Model
    Plum Pudding Model
  • What is the atomic number of an element?
    The number of electrons
    The number of neutrons
    The number of atoms
    The number of protons
  • Compounds with two elements and oxygen often end in '-_________'.
    -ate
  • The columns in the periodic table are called __________.
    Groups
  • What does 'di-' mean in a compound's name, like carbon dioxide?
    Three
    Two
    One
    Four
  • Which of the following is an example of an element?
    Oxygen (O)
    Air
    Carbon Dioxide (CO₂)
    Water (H₂O)
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