Grade 9 - Chemistry worksheet

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Across
  1. 5. A measure of the heat content in a system
  2. 7. Horizontal rows in the periodic table
  3. 9. Loss of electrons in a chemical reaction
  4. 10. A substance that cannot be broken down into simpler substances
  5. 12. Gain of electrons in a chemical reaction
  6. 15. The negative electrode in electrolysis
  7. 16. The mass of one mole of a substance
  8. 17. Particles smaller than an atom, such as protons, neutrons, and electrons
  9. 18. The process of using electricity to split compounds into elements
Down
  1. 1. Electrons in the outermost shell of an atom
  2. 2. Substances that start a chemical reaction
  3. 3. Molecules composed of two atoms
  4. 4. Elements in group 1 of the periodic table
  5. 6. Atoms of the same element with different numbers of neutrons
  6. 8. A negatively charged ion
  7. 11. The central part of an atom containing protons and neutrons
  8. 12. The tendency of a substance to undergo chemical reactions
  9. 13. A substance made of two or more elements chemically combined
  10. 14. Anything that has mass and takes up space
  11. 19. A positively charged ion