8. Se necesita una solución endulzada para preparar agua de limón, ¿Cuántos gramos de azúcar morena (C12H22O11) es necesario agregar a 600 mL de agua para hacer la solución ¼ molal? 9. Se preparo una solución 6 décimos molal de alcohol etílico (C2H6O) en agua. ¿Cuentos gramos de alcohol etílico están disueltos en 3000 mL de agua?

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

you need to have a picture of the atom that way we can answer it