CP Semester 2 Vocabulary Review: Chemistry

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Across
  1. 1. Weighted average of all the isotopes of a particular element; number shown on periodic table; it is closest to the mass number of the most common isotope for the element
  2. 8. number of protons in an atom; identifies the element; periodic table is arranged by this number
  3. 9. tells what elements and how many of each element are in a unit of that compound
  4. 10. starting substances
  5. 13. a change that affects the actual substance. Something new is formed
  6. 14. vertical columns on the periodic table that indicate the number of valence electrons an atom has
  7. 16. chemical reactions that release energy as heat
  8. 19. atoms of the same element with different numbers of neutrons
  9. 20. two or more substances physically mixed together
  10. 21. the mass of a substance per unit volume
  11. 25. nonmetals that gain electrons and become negatively charged
  12. 26. substances are not eve h. Physical Properties - properties that can be observed directly or measured with a tool without changing the chemical make-up of the substance
  13. 30. the charge on an ion
  14. 31. compound formed when 2 or more elements bond covalently.
  15. 34. simplest form of matter from which more complex substances are made (listed on the PT)
  16. 36. substances used to slow down a chemical reaction by raising the activation energy
  17. 37. two or more atoms chemically bonded to one another in a fixed proportion
Down
  1. 2. all particles in matter are identical (fixed composition)
  2. 3. properties that can only be observed by changing the chemical makeup of the substance à New substance is formed
  3. 4. chemical reactions that release energy
  4. 5. average kinetic energy of the particles of matter or how fast the particles are moving
  5. 6. matter is neither created nor destroyed during a chemical change
  6. 7. components are evenly distributed out on a microscopic level; aka: Solution
  7. 11. number of protons & neutrons in an atom
  8. 12. force that holds atoms together in a compound
  9. 15. an insoluble compound that comes out of solution
  10. 17. the maximum amount of solute that can dissolve in a certain amount of solvent at a specified temperature.
  11. 18. substance that speeds a reaction up without being permanently changed by lowering the activation energy
  12. 22. the total energy (KE & PE) of a material’s particles evenly spread out
  13. 23. horizontal rows on the periodic table that indicate the number of energy levels an atom has in its electron cloud
  14. 24. a change that affects only the physical properties of matter
  15. 27. chemical reactions that absorb energy as heat
  16. 28. charged atom that has gained or lost electrons (atoms that lose electrons are positively charged and called cations; atoms that gain electrons are negatively charged and called anions)
  17. 29. substances that are formed
  18. 32. metals that lose electrons and become positively charged
  19. 33. anything that takes up space and has mass
  20. 35. chemical reactions that absorb energy