CHEMISTRY COMES ALIVE

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Across
  1. 6. substances that react.
  2. 8. heterogeneous mixtures with large, often visible solute particles that tend to settle out.
  3. 13. state in which for each molecule of product formed, one product molecule breaks down, releasing the reactants.
  4. 15. negatively charged subatomic particles with a mass of 0 amu
  5. 17. reaction occurs when a molecule is broken down into smaller molecules or its constituent atom.
  6. 18. are substances composed of two or more components physically intermixed
  7. 19. noble gas configuration with eight electrons on the valence shell
  8. 20. regions around the nucleus in which a given electron or electron pair is likely to be found most of the time
  9. 23. number the number of protons and electrons in a atom
  10. 24. when atoms or molecules combine to form a larger, more complex molecule.
  11. 27. reactions that release energy
  12. 29. similar in composition.
  13. 30. substances that conduct an electrical current in solution
  14. 32. unique substances that cannot be broken down into simpler substances by ordinary chemical methods
  15. 33. an average of the relative weights (mass numbers) of all the isotopes of an element, taking into account their relative abundance in nature
  16. 35. a displacement reaction to form water and a salt.
  17. 36. a combination of two or more atoms held together by chemical bonds
  18. 37. substances that increase the rate of chemical reactions without themselves becoming chemically changed or part of the product.
  19. 38. model of an atom in which electrons circle the nucleus like planets circle the sun
  20. 40. energy stored or still energy
  21. 42. a substance made from two or more different elements that have been chemically joined
  22. 43. positively charged subatomic particles with a mass of 1 amu
  23. 46. are homogeneous mixtures with the smallest solute particles
  24. 48. bonds formed when valence electrons are started between atoms.
  25. 49. level the energy an electron has / the energy an electron has above ground state
Down
  1. 1. An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable.
  2. 2. polymers of simple sugars linked together by dehydration synthesis
  3. 3. covalent bonds with equal sharing of electrons and charge-balanced among atoms
  4. 4. the simplest carbohydrates/sugar
  5. 5. anything that has mass and takes up space
  6. 7. the tendency of an atom or a functional group to attract electrons toward itself.
  7. 9. gain of an electron, or the loss of an oxygen, or the gain of a hydrogen
  8. 10. the sum of the masses of the protons and neutrons of a atom.
  9. 11. substance produced from reaction.
  10. 12. a symbol one- or two-letter chemical shorthand that represents a element
  11. 14. a reaction in which the conversion of reactants to products and the conversion of products to reactants occur simultaneously.
  12. 16. are heterogeneous mixtures, the solute particles are larger than those in true solutions, but they still do not settle out.
  13. 21. energy in action
  14. 22. neutral subatomic particles with a mass of 1 amu
  15. 25. dissimilar in composition.
  16. 26. proton acceptor
  17. 28. occurs whenever chemical bonds are formed, rearranged, or broken.
  18. 31. loss of an electron or the gain of an oxygen molecule of the loss of a hydrogen
  19. 33. the basic building blocks of matter
  20. 34. an atom that tends to lose electrons and form positive ions in chemical reactions.
  21. 39. covalent bonds with unequal sharing of electrons with a slight negative charge (δ–) at one end of the molecule and, a slight positive charge (δ+) at the other end.
  22. 41. a structural variant of an element with the same number of protons and electrons but a different number of neutrons
  23. 44. proteins and other types of molecules that resists pH change on the addition of acidic or basic components.
  24. 45. bond formed between a metal and a non-metal
  25. 47. a type of chemical reaction that involves a transfer of electrons between two species where one species is oxidised and the other reduced.