A student is given a cube of metal that is known to have a mass of 125.0 grams. She measures the mass of the metal three different times with the following results: 125.1 g, 124.8 g, 125.3 g. What can be said about her precision and accuracy?

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