When beaker 1 contain salt water and blue food colourings and beaker 2 contain fresh water and yellow food colourings.when beaker 1 and beaker 2 were mixed, the zone of mixing appears thicker or thinner after blowing across the surface the second time after 9 minutes?

Answer 1

The zone of mixing would appear thinner after blowing across the surface the second time after 9 minutes. This is because the salt water in beaker 1 is denser than the fresh water in beaker 2, causing the two liquids to separate more easily when agitated. The denser salt water would sink below the fresh water, resulting in a thinner zone of mixing at the surface.