Which type of chemical reaction does this equation exemplify? 2kbr + cl2 --> 2kcl + br2 synthesis decomposition double replacement single replacement

It's a single replacement.

These equations are characterized by a single element from the periodic table replacing an element that is part of a compound.

In this example, the compound is KBr.

The element from the periodic table that is by itself is Cl2

The Cl2 replaces the Br (shown on the right side). Single replacements look that way.

D

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