Question

sasha is conducting an experiment with water, salt, and eggs to see if eggs would float.
what property of matter is sasha demonstrating and how do you know?
oa reactivity; the salt reacts chemically with the water which causes the egg to float.
ob density; the salt causes the water to be denser which causes the egg to float.
oc melting point; the salt melts in the water which causes the egg to float.
od color; the salt turns the water cloudy which causes the egg to float.

Explanation:

When salt is added to water, it increases the density of the water. Objects float when the density of the fluid they are in is greater than their own density. In this experiment, as the salt concentration (and thus water density) increases, the egg (with relatively constant density) starts to float. Reactivity (involving chemical change of substances), melting point (temperature at which solid turns to liquid), and color (visual property) are not relevant to the floating phenomenon here. Density directly relates to buoyancy (Archimedes' principle: \(F_b=
ho_{fluid}gV_{displaced}\), where higher \(
ho_{fluid}\) - density of fluid - can make \(F_b\) (buoyant force) equal to or greater than the weight of the egg (\(F_g = mg\)) for floating).

Answer:

B. density; The salt causes the water to be denser which causes the egg to float.