From the statements below identify all the chemical changes

Which change to the system wood cause the freely-moving piston to lower?

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

In a ball-and-stick molecular model, what do the sticks represent?