Chemical Change

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Across
  1. 2. Mass can not be created or destroyed.
  2. 3. A compound made of nonmetas that share electrons equally.
  3. 4. A reaction that absorbs more energy that it releases.
  4. 6. Energy that is transferred from one body to another as a result of a difference in temperature.
  5. 14. A chemical reactions take the original atoms and ______ them into new atoms.
  6. 15. The right side of a chemical equation: The resulting substances.
  7. 16. What is added to substances in chemical equations to balance them: shows how many atoms of a substance are present.
  8. 17. The smallest unit of a compound.
  9. 18. The study of heat energy
  10. 20. A substance made up of only one type of atom.
  11. 21. A reaction that released more energy than it absorbs.
  12. 23. A Measurement of how strongly an atom holds onto its electrons.
  13. 24. A chemical equation is _______ when the number of atoms are equal on both sides.
  14. 25. In an endothermic reaction, energy is _______ from the surroundings.
  15. 26. Show the number of a specific element present in a chemical equation.
  16. 27. Created when two nonmetals share two pairs of electrons.
  17. 29. A group of covalently bonded atoms that have a collective charge.
  18. 30. A compound made of nonmetals that share electrons, but the electrons are not shared equally.
  19. 31. Energy can not be created or destroyed, only transformed.
Down
  1. 1. The left side of a chemical equation: Original substances.
  2. 5. The symbolic representation of a chemical reaction.
  3. 7. A bond formed when nonmetals share pairs of electrons.
  4. 8. When a substance changes shape, size, or phase, but does not change what the substance is.
  5. 9. A way of presenting information about the chemical proportions of atoms.
  6. 10. The beginning step to balancing an equation: the equation with no coefficients.
  7. 11. What we check and reduce (if needed) at the end of balancing an equation.
  8. 12. The measure of the intensity of heat.
  9. 13. In an exothermic reaction, energy is _______ into the surroundings.
  10. 16. When a substance changes its structure or composition, changes what the substance is.
  11. 19. The way the arrow in a chemical equation is read.
  12. 22. A bond formed when metals give electrons to nonmetals.
  13. 26. Created when two nonmetals share one pair of electrons.
  14. 28. Created when two nonmetals share three pairs of electrons.