What is the percent composition of carbon in caffeine (c₈h₁₀n₄o₂)?

List four observations that indicate that a chemical reaction may be taking place

The image shows a process that releases nuclear energy which statement best identifies the process shown the process must be fusion because energy is released the process must be fusion because of have your nucleus formed a smaller nuclei the process must be fission because a large nucleus breaks into smaller nuclei the process must be fission because neutrons are formed

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?