Question

how did we make the egg float in our lab?

increase the salinity which increases the density of the water
decrease the salinity which decreases the density of the water
increase the salinity which decreases the density of the water
decrease the salinity which increases the density of the water

Explanation:

When salt is added to water (increasing salinity), the mass of the water - salt mixture increases while the volume change is relatively small. According to the density formula \(
ho=\frac{m}{V}\) (where \(
ho\) is density, \(m\) is mass, and \(V\) is volume), the density of the water increases. An object (like an egg) will float when the density of the liquid it is in is greater than the density of the object.

Answer:

increase the salinity which increases the density of the water