1st Semester Vocab Science

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Across
  1. 2. one of a number of repetitions of an experiment.
  2. 4. any factor, trait, or condition that can exist in differing amounts or types.
  3. 9. mixture that can easily see the different parts of it.
  4. 10. a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
  5. 12. two or more atoms covalently bonded
  6. 15. substance that speeds up a chemical reaction, but is not consumed by the reaction
  7. 17. Particle found in a nucleus with a positive charge.
  8. 18. regions of space around the nucleus of an atom where an electron is likely to be found.
  9. 20. bond lasting attraction between atoms
  10. 21. the total number of protons and neutrons in an atomic nucleus.
  11. 22. reaction that takes in heat
  12. 23. substance that is formed as the result of a chemical reaction.
  13. 24. an element whose properties are intermediate between those of metals and solid nonmetals.
  14. 25. energy stored in the bonds of chemical compounds
  15. 26. reaction that gives off heat
  16. 30. exothermic reaction in which something reacts with oxygen.
  17. 32. Elements that form cations
  18. 36. tells us the number of atoms of each element in a compound.
  19. 37. that takes part in and undergoes change during a reaction.
  20. 39. the variable being tested in a scientific experiment.
  21. 40. characteristic of a substance that is observed during a reaction
  22. 41. the variable that is changed or controlled in a scientific experiment.
  23. 43. an electrically charged atom
  24. 45. The central part of an atom that contains the protons and neutrons.
  25. 46. separation of a chemical compound into elements or simpler compounds
  26. 48. properties like color, size, and shape
  27. 52. chemical reaction where two compounds react, and the positive ions and the negative ions of the two reactants switch places,
  28. 53. a substance made by mixing other substances together.
  29. 54. a substance formed when two or more chemical elements are chemically bonded together.
  30. 56. how well a scientific test or piece of research actually measures what it sets out to
  31. 57. negatively charged ion
  32. 58. the smallest component of an element
  33. 59. average mass of atoms of an element
  34. 60. a change in the chemical properties.
  35. 61. chemical element that lacks the characteristics of a metal and that is able to form anions
Down
  1. 1. they carry a negative charge. The number of protons and _______ is equal
  2. 3. substances that are made of only one type of atom or only one type of molecule
  3. 5. the number of protons in the nucleus of an atom
  4. 6. process in which atoms of the same or different elements rearrange themselves to form a new substance
  5. 7. a change in the physical properties
  6. 8. properties like ability to burn, chemical relativity, etc...
  7. 11. a variable that remains constant throughout an experiment
  8. 13. one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter.
  9. 14. have no charge, found in the nucleus
  10. 16. two or more simple substances combine to form a more complex product.
  11. 19. an element reacts with a compound and takes the place of another element in that compound.
  12. 27. is constant and unchanged throughout the course of the investigation.
  13. 28. a column of elements in the periodic table
  14. 29. number of the different atoms of elements in the reactants side is equal to that of the products side.
  15. 31. each atom likes to have 8 valence electrons
  16. 33. two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons
  17. 34. particles Protons, neutrons, and electrons
  18. 35. mass divided by volume
  19. 38. the name given to a horizontal row of the periodic table.
  20. 42. bond chemical bond formed between two ions with opposite charges
  21. 44. bond chemical bond that involves the sharing of electron pairs between atoms.
  22. 47. the symbolic representation of a chemical reaction in the form of symbols
  23. 49. mixture where it all looks the same.
  24. 50. Law that states that the physical and chemical properties of the elements recur in a systematic and predictable way when the elements are arranged in order of increasing atomic number.
  25. 51. positively charged ion
  26. 55. numbers placed before the reactants in a chemical equation