40 points
classify each one of these examples as a physical or chemical change. give a reason (observation) of why each example is a specific type of change.

question:

a. the teacher puts a sugar cube into a container of warm water. eventually the sugar cube is no longer visible. what type of change is this and why? (2 points)

b. the teacher puts vinegar into a small container of baking soda. the combined substances begins to fizz and bubble. what type of change is this and why? (2 points)