The "end point" is the measured volume of solution that yields a change in appearance, usually int he form of a change in an indicator. a. analyte b. titrant c. precipitate d. solute

A- Analyte

The end point is the measured volume of analyte solution that yields a change in apperance,usually in the form of change of color in an indicator. A titrant is added to this analyte in order to arrive at the equivalence point,(where the concentration of H+ ions is equal to the concentration of OH- ions) and determine the concentration of the analyte. The end point is an indication that the equivalence point has been achieved.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e