Chemistry Review one 2025

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Across
  1. 2. these hold atoms together by sharing or donating electrons
  2. 4. tells us the number of protons and the number of electrons in an atom
  3. 5. this number is found in front of a chemical formula and tells us the number of molecules of that compound
  4. 8. anything that has mass and takes up space
  5. 10. Steam turning to Water turning to ice is the type of change because it is still H2O
  6. 12. negatively charged particles found outside the nucleus of an atom
  7. 13. This number found in front and below an element tells us the number of atoms of that element H2O
  8. 15. positively charged particles in the nucleus of an atom
  9. 17. Phase changes occur hen this is added or removed
  10. 18. two or more elements chemically combined
Down
  1. 1. Type of change like burning which always forms a new substance
  2. 3. compared to the properties of a compound, the properties of the elements that make them are
  3. 4. tells us the number of protons plus the number of neutrons
  4. 6. most of the elements on the periodic table are these hard durable substances
  5. 7. Pure substance that is the ingredients to everything everywhere
  6. 8. the smallest amount of a compound you can have is one
  7. 9. the study of matter and properties of substances
  8. 11. the smallest amount of matter you can have
  9. 14. this element makes up most organic molecules because of its ability to bond to so many atoms
  10. 16. neutral particles found in the nucleus of an atom