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ATOMS AND MOLECULES

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  • When the properties of the substances present remain the same, are we talking about a mixture or a compound being formed?
    Mixture
  • Water is made up of two atoms of hydrogen bonded to one of oxygen, giving H2O. This means, if there are 600 H molecules, there are ___ O molecules
    -
  • H, Na, He is the symbol of.....
    Hydrogen
  • what is the purpose of a chemical reaction, and explain how products are formed
    -
  • In solids, particles move the fastest. True or False and say why
    False
  • Draw C atom
    -
  • When substances are simply mixed together, without chemical reaction, are we talking about a mixture or a compound being formed?
    Mixture
  • define atomic and mass number
    -
  • Give an example of an element, compound and molecule
    (any in the periodic table)
  • Draw Na+
    -
  • Create K+
    False
  • Give an example of a synthesis reaction
    water, ammonia, H2, etc
  • atoms of different elements can combine to make
    molecules
  • Create O-2
    a compound breaks down to form two or more substances
  • Define an element, compound and molecule
    -
  • Which are the two main elements that compose the universe?
    Hydrogen and Helium