2. calculate the density of a liquid in a beaker. the beaker has a mass of 15 grams when empty. the beaker plus an unknown liquid has a mass of 64 grams. what is the density (g/ml) of the liquid if its volume is 10. ml?

The density of the liquid is 4.9 g/ml

Explanation:

Density of a liquid is usually measured by filling a beaker of known weight and known capacity (total volume in ml you can fill it) and weighing it. The difference between the total weight (beaker+liquid) and the beaker weight is the liquid weight. Finally, you must divide liquid weight/volume to obtain density.

For the problem:

beaker=15 g

beaker+liquid=64 g

⇒liquid= 64 g - 15 g = 49 g

density= = = 4.9 g/ml

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