Final answer:
A suspension is a heterogeneous mixture with large solute particles that can be filtered out. The density of an object, like a foam sample, can be determined using the water displacement method. The density of spheres hanging from springs can be compared and ranked by measuring mass and volume displacement.
Step-by-step explanation:
A suspension is a heterogeneous mixture where the solute particles are substantially larger than in solutions, typically larger than 10,000 Å. Over time, the solid material in a suspension will tend to settle out, and it can be separated from the solvent through filtration.
To determine the density of an object, such as a foam sample, using the water displacement method, you would typically submerge the object in water and measure how much water is displaced. This displacement can give you the volume of the sample. To find the density, you would then divide the mass of the sample by this volume.
In an exercise where four spheres are suspended from springs, you could calculate the density of each sphere if you have information about their mass and the volume they displace. By comparing these densities, you can rank each sphere from the least dense to the most dense.