What is a reaction intermediate? a. a series of elementary reactions that add up to the overall reaction
b. an individual step that describes a single molecular event in a reaction
c. the product of one step in a multistep reaction
d. a collision between two molecules

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

b.false that your answer