En la transformación de la energía en ningún sistema es 100% eficiente y alguna energía se pierde en forma de calor verdadero o falso

The rock in a lead ore deposit contains 89 % pbs by mass. how many kilograms of the rock must be processed to obtain 1.5 kg of pb?

Drug abuse will not lead to physical and psychological dependence. true or false ?

Phosphorous can form an ion called phosphide, which has the formula p3−. this ion can form an ion called phosphide, which has the formula p3−. this ion properties very similar to those of pforms when a phosphorus atom loses three protonsis called a cationcontains 18 electrons