Question

Ms. Bristol measured the mass of a closed beaker containing several ice cubes. The mass was 100 g. An hour later, after the ice cubes had melted, Ms. Bristol measured the mass of the beaker again. What was the mass of the beaker the second time?

A. 75 g

B. 100 g

C. 125 g

D. 150 g

Answer 1

The correct answer is B.100 g. Hope this helps :)

Answer 2

B. 100 g
Assuming that Ms. Bristol wiped off any condensation prior to making with mass measurements, the mass of the beaker and water (in solid, or liquid form), will remain constant. This is a simple demonstration of the law of conservation of mass. Since the beaker was closed, matter could neither enter, nor exit the beaker.