Lesson 11: Chemical Reactions Puzzle

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Across
  1. 1. in a reaction between hydrogen and oxygen to form water, hydrogen and oxygen are called --?--
  2. 3. boiling an egg is an example of this type of chemical reaction.
  3. 5. this is the energy necessary to start a chemical reaction.
  4. 6. it is a process that involves the rearrangement of atoms or a group of atoms to form new substances.
  5. 8. because of the law of conservation of mass, a chemical equation must --?--
  6. 9. burning wood is an example of this type of chemical reaction.
  7. 10. the law of conservation of --?-- states that matter is neither created nor destroyed during a chemical reaction.
  8. 12. melting ice is an example of physical change.
Down
  1. 2. chemical reactions are represented by --?---
  2. 4. it is a chemical reaction in which heat is absorbed.
  3. 7. it is a chemical reaction in which heat is released to the environment.
  4. 11. in a chemical reaction resulting in the formation of water, hydrogen and oxygen are called -?--