2. A student experimentally determines the specific heat of a liquid to be 4.3 J/g x Cº. He then looks up the specific heat of a liquid on a reference table and finds that it is 4.2 J/g x Cº. What
is his percent error?

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 should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

there are two significant figures.