How many CAL must be added to heat 399.9 g of water from -20.0oC to 95.0 oC ? Don’t do the calculation, just indicate which conversion factors would be used __1__ specific heat of the solid, 0.504 cal/goC __2__ specific heat of the liquid, 0.999 cal/goC __3__ specific heat of the gas, 0.497 cal/goC __4__ heat of fusion, 79.7 cal/g __5__ heat of vaporization, 539 cal/g A.  used           B.  not used _______ _______ _______ _______ _______

An electrolyte solution will exhibit the Tyndall effect

The solubility of oxygen in water at 1.00 atm and 30.0 oC is 0.00076%. How many grams of oxygen would be expected in 1000. g of water ?

A colloidal dispersion must be stirred or it will settle to the bottom

If the partial pressure of O2 is 40 torr in the blood and 45 torr in the tissues, then O2 will diffuse from the tissues into the blood

If two molecules have the same mass and the same attractive forces, then the one with a more spherical shape will have a lower boiling point

How many moles of helium is in a 250. L balloon at STP ? Choose only from the section first: This is a __1__ problem  A.  missing variable                  B.  change in conditions                  C.  1 mol         D.  density = molar mass/22.414 L                     E.  partial P second: we need to solve for __2__ using the equation __3__  F.  P        G.  P1        H.  P2        I.  V         J.  V1 (not V)          K.  V2 (not V)         L.  n M.  n1 (not n)          N.  n2 (not n)           O.  T           P.  T1 (not T)           Q.  T2 (not T)  R.  R = 8.205 x 10-2 L atm/K mol           S.  1 atm = 760 torr   T.  Ptotal = P1  +  P2  + …….         U.  PV = nRT V.  P1V1        P2V2    –––––– = ––––––      n1T1         n2T2 finally: The answer is __4__ w.  11.2 mol           x.  62.5 mol           y.  5600 mol         z.  68300 mol _______ _______ _______ _______

Answer the following about drawing the attractive force between a water molecule (H2O) and a molecule of phosphorus trichloride (PCl3).   The H in the O-H bond in the water molecule has  __1__ and the P in the P-Cl bond in the PCl3 molecule has  __2__ . A. no charge B. a partial + charge C. a partial – charge _______ _______

Molecules which are solids at 100.0 oC have strong intermolecular attractive forces compared to water

Heavier gases diffuse faster than lighter gases