Science vocabulary 8th grade unit 2

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Across
  1. 1. reaction – a change caused by the interaction of two or more substances (reactants) resulting in the formation of new substances (products)
  2. 4. – combined atoms of the same element (e.g., O2)
  3. 5. – a substance made of two or more elements
  4. 7. equation – a representation of a chemical reaction by symbols and numbers
  5. 10. – the formation of solids from a solution
  6. 11. – the number placed in front of a chemical formula in a chemical equation; represents the number of molecules of that substance
  7. 12. of conservation of mass – matter is not created or destroyed; only rearranged
Down
  1. 2. formula – a representation of a molecule or compound in which the elements are represented by their symbols and subscripts represent the number of atoms of each element
  2. 3. – the number written to the right and slightly below an element in a chemical formula; represents the number of atoms of an element present in a chemical formula
  3. 6. – substance(s) resulting from a chemical reaction
  4. 8. – substances that are combined and changed during a chemical reaction
  5. 9. change – the formation of a new substance with different properties; cannot be undone by physical means