True or false? For a collection of many atoms, some are in an excited stated and others are in the ground state. At any point in time most of the atoms have electrons in the ground state

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

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

answer; natural resources;