Question

starch molecules are too large to pass through the tubing into the beaker. which errors could have caused starch to appear in the beaker despite this fact? check all possible errors. not washing the outside of the tubing after filling it with starch reusing droppers for different solutions adding glucose to the solution in the dialysis tubing using a beaker that had not been cleaned thoroughly

Explanation:

1. Not washing the outside of tubing with starch could transfer starch to beaker.
2. Reusing droppers for different solutions can cross - contaminate and introduce starch.
3. Adding glucose is not related to starch appearance.
4. Using an unclean beaker may have residual starch.

Answer:

not washing the outside of the tubing after filling it with starch, reusing droppers for different solutions, using a beaker that had not been cleaned thoroughly