Chemistry

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Across
  1. 1. temperature scale temperature scale where 0°C and 100°C are defined as the freezing and boiling points of water, respectively.
  2. 2. is force per area.
  3. 4. A substance which is made up of loads of small molecules joined together.
  4. 6. metal is an element belonging to Group II of the periodic table. Examples of alkaline earth metals are magnesium and calcium.
  5. 11. is any organic molecule that has a -COH group.
  6. 12. A horizontal row of elements in the periodic table.
  7. 14. is a molecule that contains a R-CO-R' functional group. An example of a common ketone is acetone (dimethyl ketone).
  8. 18. describes a process that absorbs heat. Endothermic reactions feel cold.
  9. 19. describes a process that gives off heat.
  10. 21. group functional group consisting of a carbon double bonded to oxygen and single bonded to a hydroxyl (-COOH).
  11. 25. is a group of elements sharing similar properties. It is not necessarily the same thing as an element group. For example, the chalcogens or oxygen family consists of some different elements from the nonmetal group.
  12. 26. solid in which atoms are bonded to other atoms of the same type.
  13. 28. rare earth metal with element symbol Ce and atomic number 58.
  14. 29. is a possible value of energy that an electron can have in an atom.
  15. 30. is a property of a physical object that quantifies the amount of matter it contains.
  16. 36. law that states the properties of elements recur in a predictable and systematic way when they are arranged by increasing atomic number.
  17. 37. is an ionic compound that dissolves in water to produce ions, which can conduct electricity. Strong electrolytes completely dissociate in water, while weak electrolytes only partially dissociate or break apart in water.
  18. 38. binding of an element to itself via covalent bonds, forming a chain or ring
  19. 39. number - the number of protons in the nucleus of an atom of an element.
  20. 40. volume occupied by one mole of an element at room temperature.
  21. 42. is how repeatable a measurement is. More precise measurements are reported with more significant figures.
  22. 44. electrode where reduction occurs; usually the negative electrode.
  23. 45. The substance which adds oxygen to another substance.
  24. 47. is something made as a result of a chemical reaction.
  25. 48. is a unit of temperature. A Kelvin is equal in size to a degree Celsius, although Kelvin starts from absolute zero. Add 273.15 to a Celsius temperature to get the Kelvin value. Kelvin is not reported with a ° symbol. For example, you would simply write 300K not 300°K.
  26. 49. tube a vacuum tube with a source of electrons, a fluorescent screen, and means of accelerating and deflecting the electron beam.
Down
  1. 1. is the name for the element with atomic number 55 and is represented by the symbol Cs. It is a member of the alkali metal group.
  2. 2. The chemical reaction combining monomers to form polymers.
  3. 3. functional group consisting of a carbon atom double bonded to oxygen, C=O.
  4. 4. tabular arrangement of elements by increasing atomic number, ordered according to trends in recurring properties.
  5. 5. ion with a positive electrical charge.
  6. 6. is the acronym for the molecule adenosine triphosphate.
  7. 7. is when a titration is stopped, typically because an indicator has changed color. The endpoint need not be the same as the equivalence point of a titration.
  8. 8. an ion consisting of one carbon bonded to three oxygen atoms (CO32-) or a compound containing this ion.
  9. 9. A scale which shows how acidic or alkaline a substance is.
  10. 10. horizontal row of the periodic table; elements with the same highest unexcited electron energy level.
  11. 13. value used to describe the size of an atom, usually half the distance between two atoms just touching each other.
  12. 15. anaylysis A method of finding out the elements present in an unknown substance via a series of chemical tests.
  13. 16. Loss of electrons in a chemical reaction.
  14. 17. surrounding gases, such as the gases surrounding a planet that are held in place by gravity.
  15. 18. is using electricity to break the bonds in a compound to break it apart.
  16. 20. is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity
  17. 22. parts per million
  18. 23. are molecules that are non superimposable mirror images of each other.
  19. 24. is the property of matter which reflects the quantity of energy of motion of the component particles.
  20. 27. The arrangement of elements in the order of increasing atomic number in a table.
  21. 31. is a metal in Group I of the periodic table. Examples of alkali metals include lithium, sodium, and potassium.
  22. 32. substance that increases the chemical reaction rate by decreasing its activation energy.
  23. 33. parts per billion
  24. 34. average mass of atoms of an element.
  25. 35. is any organic molecule that has an -OH group.
  26. 41. A charged particle found in the nucleus of an atom.
  27. 43. is energy of motion. The more an object moves, the more kinetic energy it has.
  28. 46. reaction - An addition reaction is a chemical reaction in which atoms add to a carbon-carbon multiple bond.