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2010-06-13 17:38:43

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  1. what is the smallest unit of an element?
  2. what is the smallest unit of a covalent compund?
  3. is tap water a compound, homegeous or heterogenous mixture?
    homegenous mixture
  4. what is the trend in size for the elements on the periodic table?
    diameter increases as u go down-diameter decreases as u go across
  5. on the periodic table, columns are known as?
    groups or families
  6. on periodic table rows across are known as?
  7. the number of protons contained in the nucleus is?
    atomic number
  8. the weight of the atom(equal to number of protons plus neutrons) number is always a whole number
    mass number (numbers on periodic table have decimals & those are average atomic masses-always round to nearest whole #)
  9. atoms that have different number of electrons
    ions-they can be positive or negative
  10. atoms that have different number of neutrons
    isotopes-they dont have a charge unless there is one noted
  11. what is the name of the law that says that compounds must combine definite ratios?
    law of definite proportions
  12. what is the name for positively charged ion?
  13. what is the name for negatively charged ion?
  14. metals tend to gain or lose electrons in order to become stable?
  15. what is rule that states atom is most stable when it has 8 electrons in its valence shell?
    octet rule
  16. what law states that all atoms in a chemical reaction from the reactants must be accounted for in the products-sum of all masses of reactants=sum of the masses of products
    law of conservation of matter
  17. what law states that all compounds no matter wher the sample was taken, are created by the combination of elements in the same definite proportions
    law of definite proportions
  18. atoms are created from 3 smaller particles
    protons neutrons electrons
  19. which compound is formed by bonds made between an anion and a cation resulting from an exchange of electrons?
  20. which bonds are formed from the sharing of valence electrons?
  21. what is the measure of the attraction of electrons to the nucleus of an atom in a covalent bond-also increases from left to right-decreases from top to bottom periodic table
  22. what are the 5 types of chemical reactions?
    decomposition, synthesis, single replacement, double replacement, acid base neutralization
  23. what is another name for a homegeneous mixture
  24. what are 3 steps in breaking apart a solution?
    separation of solute, separation of solvent, interaction between solvent/solute particles
  25. the amount of solute that can be dissolved in a solvent
    solubility-generally increases with temperature or gases in liquids increase with pressure
  26. substance that gives a H+(proton) when dissolved in solution-also tastes sour, turns litmus red, reacts with many metals to produce H2 gas
  27. substance that gives up OH+when dissolved in solution(accepts a proton)-also tastes bitter, slippery to touch, turns litmus dk purple
  28. substance that breaks apart in water to produce inos, making solution able to conduct electricity
  29. what happens when acids and bases are mixed together and H2O is produced?
    acid base neutralization