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Across
  1. 3. Reaction absorbing heat energy from its surroundings.
  2. 7. Two or more atoms chemically bonded together.
  3. 8. Equation: Representation of a chemical reaction using symbols.
  4. 9. Atoms of the same element with different neutron counts.
  5. 12. Smallest unit of an element, containing protons, neutrons, electrons.
  6. 14. Atom or molecule with an electrical charge due to electron gain/loss.
  7. 15. Gain of electrons during a chemical reaction.
  8. 18. Light wave with frequencies higher than visible light.
  9. 21. Bond: Bond where atoms share electron pairs.
  10. 22. The part of the electromagnetic spectrum detectable by human eyes.
  11. 23. Substance that donates protons (H⁺ ions) in solution.
  12. 24. Substance that increases reaction rate without being consumed.
  13. 26. Loss of electrons during a chemical reaction.
  14. 27. Electrons: Electrons in the outer shell involved in chemical bonding.
  15. 29. Scale indicating the acidity or basicity of a solution.
  16. 31. Refers to microwaves; electromagnetic waves with shorter wavelengths than radio.
  17. 32. A wave that travels through a medium, carrying audible energy.
  18. 33. Bond: Bond formed by attraction between oppositely charged ions.
Down
  1. 1. Substance formed as a result of a chemical reaction.
  2. 2. Reaction where energy is given off to its surroundings
  3. 4. Pure substance of only one type of atom.
  4. 5. waves that are a form of radiation that travel through the universe
  5. 6. Electromagnetic wave visible to the human eye.
  6. 10. the particles of the medium vibrate at right angles to the direction that the energy travels
  7. 11. wave that moves in the same direction as the way in which the particles are moving
  8. 13. Starting substance in a chemical reaction.
  9. 16. Lowest point on a wave, opposite the crest.
  10. 17. Homogeneous mixture of two or more substances.
  11. 19. Substance that accepts protons or donates hydroxide ions (OH⁻).
  12. 20. Number of wave cycles passing a point per second.
  13. 25. Highest point on a wave, where displacement is maximum.
  14. 28. Height of a wave from rest to crest or trough.
  15. 30. Substance made of two or more elements chemically combined.