CHEM

• Electronegativity is the ability of an atom to attract shared pair of electrons towards itself.
• most electronegative element - fluorine
• directly proportional


  temperature and pressure is (gay lussac)
• directly proportional, density increases as pressure increases


  in gas law, pressure and density is ___________
• directly proportional, density increases as mass increases


  in gas law, molar mass and density is ___________
• directly proportional, density increases as molar mass increases


  in gas law, mass and density is ___________
• indirectly proportional, density decreases as volume increases


  in gas law, volume and density is ___________
• indirectly proportional, density decreases as temperature increases


  in gas law, in an expandable container, temperature and density is
• directly proportional, density increases as temperature increases


  in gas law, in an rigid container, temperature and density is
• increases


  if you increase pressure, add moles and add mass, density
• pressure increases and density increases


  if you lower the volume what will happen to pressure and density
• PM=dRT


  GAS LAW EQUATION
• d=PM/RT or d=PVM/RT


  DENSITY IN GAS LAW EQUATION
• 1.251g/L


  calculate the density of nitrogen gas at STP
• 1.31 g/L


  calculate the density of nitrogen gas at 25C and at a pressure of 872 torr
• 139.1 g/mol


  A sample of gas at 300k has a mass of 14.5 grams. Calculate the molar mass of this gas which is confines in a 3.0 liter tank at a pressure of 650 mmHg ( g/mol)
• 47.067 g/mol


  calculate the molar mass of a gas that has a density of 2.1g/L at STP ( g/mol)
• 760 torr = 760 mmHg = 101.3 kPa = 101 300 pascal


  1atm= torr = mmHg =kPa = pascal
• indirectly proportional


  pressure and volume is (boyle's)
• directly proportional


  temperature and volume is (charles)
• directly proportional


  number of moles and volume is (avogadros law)
• 273 k, 1 atm, 22.4L


  at STP t=?k p= ?atm mol= ?L
• decrease


  A student inflates a balloon with helium then places it in the freezer. The student should expect
• The pressure will increase


  If a hairspray can is heated, what can be expected of the pressure of the gas inside the can?
• all of the above


  Which of the following would increase the (gas) pressure of a system?

  Increase the Temperature

  Pump in more gas

  Decrease the volume

  All of these
• all of these


  Absolute zero is

  0 K

  where there is no molecular movement

  the coldest temperature possible

  all of these
• pure substance


  sharp boiling and melting points

  may undergo phase change but returns to its original form
• compound


  separated through electrolysis or electric current

  constant in composition
• colloid

  exhibts tyndall effect, brownian movement and adsorption
• true


  eletron's exact position and momentum cannot be known (t or f)
• isotopes


  same atomic number but different atomic weight
• anion

  negatively charged ions
• cation

  positively charged ions
• neutron + proton


  formula for atomic number
• mixture


  varies in composition
• noble gases


  stable-non reactive
• properties, valence


  in periodic table,

  groups have similar _________ because of same _______
• stronger


  the closer the electron to the nucleus, the _______ the attraction
• bonds that are

  hard, very high melting and boiling points
• attraction between positive and negative ions