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science module 4

  1. electrolysis
    the use of electricity to break a molecule down into smaller units
  2. polar molecule
    a molecule that has slight positive and negative charges due to an imbalance in way electrons are shared
  3. solvent
    a liquid susbstance capable of dissolving other substances
  4. solute
    a substance that is dissolved in a solvent
  5. cohesion
    the phenomenon that occurs when individual molecules are so strongly attracted to each other that they tend to stay together even when exposed to tension
  6. hard water
    water that has certian dissolved ions in it predominately calcium and magnesium ions
  7. supposed you did an electrolysis experiment like experiment 4.1 on hydrogen peroxide which has a chemical formula of H2O2 if it worked properly which of the following results would u expect?   a. same as water    b. equal amounts of H and O      c. twice as much O as H
    b. equal amounts of hydrogen and oxygen
  8. suppose you peform experiment 4.1 with a testtube that had a crack in it. gas could slowly leak out of the crack but not merely as quickly as it is being made in the experiment. suppose further that the crack was in the test tube that held hydrogen gas. which chemical formula might result from such a botched experiment/ HO or H4O?
    HO because if the test tube had a leak there would be less hydrogen in the tube so we pick the formula that has the least hydrogen which is HO
  9. epsom salts which you used in the experiment 4.1 has the chemical formula MgSO4. how many atoms are in a molecule of epson salt
    6
  10. calcium carbonate is an ionic substance commonly called chalk if molecule has one calcium atom one carbon atom and three oxygen atoms what is its chemical formula
    CaCO3
  11. one of the most common household cleaners is ammonia which has a chemical formula of NH3 how many atoms are in a molcule in ammonia
    4
  12. a certian molecule is composed of atoms that all pull on electrons with the same strength  is this molecule polar
    no it is nonpolar
  13. baking soda dissolves in water will it dissolve in vegetable oil which is a nonpolar substance
    no because if it dissolves in water which is polar it is either polar or ionic. its ionic so it wont dissolve into a nonpolar object
  14. carbon tetrachloride will not dissolve in water . it is most likely made of ionic molecules , polar, or nonpolar
    nonpolar
  15. suppose you were able to count the molecules in a substance which would have more molecules  1 liter of water or 1 liter of ice
    1 liter of water
  16. what if the substance in question 10 were virtually any other substance what would the answer be
    1 liter of ice
  17. what is responsible for water being a liquid at room tempurature as well as for waters cohesion
    hydrogen bonding
  18. what causes surface tension
    cohesion
  19. why is water harder in certian regions of thre world than in others
    beacause hard water is made of CERTIAN IONS  that can only be found in certian parts of the world
Author
ToriG
ID
286952
Card Set
science module 4
Description
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