Question

a teacher demonstrates an activity to show how different objects interact. he labels two beakers 1 and 2 and fills them with hot water. he adds one spoonful of sugar to beaker 1 and one spoonful of sawdust to beaker 2. the teacher leaves the beakers undisturbed for a few minutes and asks the students to record their observations.
which observation correctly describes how sugar and sawdust interact with water?
○ sugar dissolves in water, and sawdust floats on water.
○ sugar evaporates from water, and sawdust floats on water.
○ sugar dissolves in water, and sawdust settles at the bottom of the beaker.
○ sugar evaporates from water, and sawdust settles at the bottom of the beaker.

Explanation:

Sugar is a water-soluble substance, so it dissolves completely in hot water and mixes uniformly, making it no longer visible. Sawdust is less dense than water but does not dissolve; when left undisturbed, small sawdust particles will float on the surface of the water rather than settling. The other options are incorrect because sugar does not evaporate from water in this short time frame, and sawdust does not settle at the bottom.

Answer:

Sugar dissolves in water, and sawdust floats on water.