Suggest a procedure (flow chart) for obtaning pure, crystalline
caffeine from your crude preparation?

Iknow #2 is d. i just need to know why

How do forces between particles in gases compare to forces in the other states of matter? o a. the forces in gases are stronger than forces in solids but weaker than forces in liquids. o b. the forces in gases are weaker than forces in solids but stronger than forces in liquids. o c. the forces in gases are weaker than forces in solids and liquids. o d. the forces in gases are stronger than forces in solids and liquids. submit

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