Chemical Reactions Review

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Across
  1. 3. Energy connections which hold atoms together to form molecules.
  2. 4. The substance(s) produced in a chemical reaction. The products are listed to the right of the arrow in the equation.
  3. 6. The original substance(s) that are present at the beginning of a reaction. In an equation, these are listed to the left of the arrow.
  4. 8. a character written slightly lower than the letters around it. In a chemical formula, it indicates the number of that type of atom in the molecule. The subscript is always to the right of the element symbol.
  5. 12. chemical ______: A shorthand way to describe the kind and number of atoms that make up a compound. Each element is identified by one or two letters and a compound is identified by its combination and proportions of elements.
  6. 13. Something that can be observed about a substance. Examples include color, smell, or boiling point.
  7. 14. Something made up of all the same atoms or groups of atoms.
  8. 16. a chemical reaction that absorbs energy (requires energy input)
  9. 17. A substance composed of two or more different elements that are chemically combined and that are present in definite proportions.
  10. 18. type of energy released when a chemical compound reacts to produce new compounds
Down
  1. 1. The outer shell electrons that can participate in the formation of chemical bonds.
  2. 2. A substance composed of 2 or more atoms chemically combined.
  3. 5. Law of Conservation of ____: ___ is neither created nor destroyed during a chemical reaction. ____ is ALWAYS conserved.
  4. 7. chemical ______: a symbolic representation of the reactants and products in a chemical reaction.
  5. 9. The relative size of things.
  6. 10. occurs when the atoms and molecules of 2 or more substances rearrange to form new substances. In a chemical ____, bonds are broken and new bonds are formed
  7. 11. chemical reaction that releases energy to its surroundings as heat
  8. 15. the full-sized number in front of a chemical formula in a chemical equation that signifies the number of atoms or molecules involved in the reaction.