70. Make the following conversions. a. 157 cs to seconds
b. 42.7 L to milliliters
C. 261 nm to millimeters
d. 0.065 km to decimeters
e. 642 cg to kilograms
f. 8.25 X 102 cg to nanograms

Answer(d) unstable compounds that convert to acetals in the presence of alcohol and an acid; (b) semiacetals produced by alcohol subtraction from ketone;

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.

They both go downwards and the can break apart rocks