A small beaker contains 50 milliliters of water at 20°C. If three sugar cubes are placed in the
beaker, they will eventually dissolve. Which
action would speed up the rate at which the
sugar cubes dissolve?
F) Use less water initially.
G) Transfer the contents to a larger beaker.
H) Cool the water and sugar cubes to 5°C.
J) Heat and stir the contents of the beaker.

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