unit 6a

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Across
  1. 3. A chemical bond is a lasting attraction between atoms that enables the formation of chemical compounds.
  2. 5. The alkali metals are a group of elements in the periodic table.
  3. 10. An electron in an outer shell of an atom that can participate in forming chemical bonds with other atoms.
  4. 11. A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulas.
Down
  1. 1. Physical changes occur when objects or substances undergo a change that changes the physical form of a composition but not the chemical composition.
  2. 2. the result of a chemical reaction.
  3. 4. The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy,
  4. 6. Chemical changes occur when a substance combines with another to form a new substance, called synthesis
  5. 7. a substance that takes part in and undergoes change during a reactio
  6. 8. The noble gases make a group of chemical elements with similar properties.
  7. 9. A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound, using a single line of chemical element