The slush was a heterogeneous mixture because there were visible differences and they could be separated by filtering. The melted slush was a suspension because the gravel and salt would easily settle out if they were left undisturbed. The filtrate would be considered a colloid because it still contains the salt particles, but they do not settle out. The dry collected solids were a heterogeneous mixture because there were visible differences and they could be individually, physically separated. Lastly the dissolved solids were a compound because all that remained was salt which is made up of two or more elements which are joined together. The AHS snack would have been a heterogeneous mixture as well because there were many different contents that were visibly different, such as chex, cheerios, and pretzels and could have been easily separated. The slush contained water, salt, and rock.