Question

If your copper was still wet when weighed, will your experimental mass percent (results #1) be too high or too low relative to the true (theoretical) mass percent?

a) Too high
b) Too low
c) Accurate
d) Not affected

Answer 1

Wet copper would lead to an experimental mass percent that is too high because the additional water weight would falsely increase the measured mass.

Step-by-step explanation:

If your copper was still wet when weighed, the experimental mass percent would be too high relative to the true (theoretical) mass percent. The presence of water would add additional mass to the copper, thus increasing the measured mass beyond its actual dry mass. When conducting experiments involving mass percent calculations, it is important to ensure that the samples being weighed are dry to obtain accurate results. When calculating mass percent, this additional mass would lead to a value higher than the true mass percent.