Two water solutions that have a density of 1.00 g/mL are mixed, and a reaction occurs. The
temperature rises from 25.0°C to 27.0°C. Given that the heat capacity is 4.18 J/g x°C and that the
total mass of the water is 75.0 g, what is the heat change for the reaction?

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

it is stable as it is in group 0 which have full outer shells of electrons