Your teacher asks you to follow the instructions in a lab to produce several known chemical reactions. during these procedures, you are required to record any observations that suggest chemical reactions have occurred. which of these list of observations best describes evidence of chemical reactions? a) a liquid melts and becomes a solid. b) when heated steam comes out of a test tube. eliminate c) a gas or solid is formed from two liquid solutions. d) the two chemicals separate and form two distinct layers.

chemical energy is stored in the chemical bonds of atoms and molecules. it can only be seen when it is released in a chemical reaction. when chemical energy is released, the substance from which the energy came is often changed into an entirely different substance.

this chemical reaction releases energy in the form of light and heat. chemical energy is the potential energy stored in the arrangement of atoms within molecules. breaking chemical bonds requires energy, while forming new chemical bonds releases energy.

the atp molecule can store energy in the form of a high energy phosphate bond joining the terminal phosphate group to the rest of the molecule. in this form,energy can be stored at one location, then moved from one part of the cell to another, where it can be released to drive other biochemical reactions.

tracks, burrows, eggshells, nests, tooth marks, or gastroliths