Chemistry A Final Exam review

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Across
  1. 2. Looking at a periodic table, which element would be most reactive? (Sulfur, Nitrogen, Fluorine, Bromine)
  2. 3. Scientific Knowledge can change when scientists conduct _____.
  3. 6. This state, in which the particles are at extremely high temperatures, rarely found on Earth
  4. 8. The 3 _______ particles of an atom are protons, neutrons, and electrons
  5. 9. A ____ substance is made of either an element or a compound
  6. 11. Chemical equations always have an ____ number of an element on both sides of the equation
  7. 14. ______ bonds share electrons between two atoms at the same time.
  8. 15. An atom that has a positive or negative charge
  9. 17. A measurement of time
  10. 24. When a chemical compound is exposed to a catalyst and breaks down into separate elements and/or different compounds, this is called a ______ reaction.
  11. 26. _____ Compounds have a metal and a nonmetal.
  12. 28. ____ bonds form because electrons can move freely between the atoms
  13. 29. The electron dot ______ shows how many valence electrons an element has
  14. 30. Scientific Knowledge established through direct observation
  15. 31. An educated guess
Down
  1. 1. Something that can be test/proven true or false.
  2. 4. The chemical symbol K is what element?
  3. 5. A small yellow ball that represents the Sun is an example of a ___ model.
  4. 7. The last column of the Periodic Table is called the ____ gases.
  5. 10. ____ are on the left side of a chemical equation
  6. 12. Orbit the nucleus and have a negative charge
  7. 13. Particles move freely but do not separate from neighboring particles
  8. 16. A statement that is generally an opinion or belief and is not testable.
  9. 18. Can be found on the Periodic Table
  10. 19. The _____ of an element increases on the Periodic Table as it goes to the right and down.
  11. 20. Salt dissolving in water is an example of a ______ change
  12. 21. Rust is an example of a _____ change
  13. 22. It retains its shape regardless of the shape of the container
  14. 23. The number of valence electrons an element has can be determined by what ______ it is in on the Periodic Table
  15. 25. _____ are on the right side of a chemical equation
  16. 27. It expands to fill the volume of the container
  17. 28. A measurement of length