PS: Chemistry P2

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Across
  1. 4. The center of the atom. Where the Proton and neutron are located.
  2. 6. A negatively charged subatomic particle located outside of the nucleus of the atom.
  3. 8. One of the fundamental states of matter. A high-energy state of atoms and molecules.
  4. 9. One of the fundamental states of matter in which the molecules do not have a fixed volume or shape. Molecules move the fastest.
  5. 10. Physical change of matter that are reversible. solid One of the fundamental states of matter in which the molecules have both a fixed volume and a fixed shape. Molecules move the slowest.
  6. 12. An element or compound produced by a chemical reaction.
  7. 13. One of the fundamental states of matter in which the molecules have both a fixed volume but not a fixed shape
  8. 14. Any change that does change the identity. Indicates how substance reacts with something else. Matter will be changed into a new substance
  9. 15. A substance that speeds up a chemical reaction, but itself does not undergo any permanent chemical change
  10. 16. A reaction in which the nucleus of an atom splits into two or more smaller, lighter nuclei.
  11. 18. A reaction in which two nuclei combine to form a nucleus.
  12. 20. Atoms of the same element with identical atomic numbers but different atomic masses due to different number of neutrons in the nucleus
Down
  1. 1. An element or compound that enters into a chemical reaction.
  2. 2. The transition of a substance directly from the solid to the gas state, without passing through the liquid state
  3. 3. A neutral particle located in the nucleus with a charge of zero.
  4. 5. A chemical reaction where energy is absorbed by the system from the surroundings
  5. 7. A chemical reaction where energy is released from the system to the surroundings
  6. 11. Energy in chemical reactions, it is the energy required to break chemical bonds to allow the reaction to proceed to products
  7. 12. A positively charged subatomic particle located in the nucleus of an atom.
  8. 17. Atoms combined in fix quantities. Atoms can be separated only by destroying substance.
  9. 19. The outside of the atom. Where electron's are located.
  10. 21. Any change that doesn’t change the identity. Observed with senses. Determined without changing matter.