Further solidifying her mad-scientist persona, [Jeri Ellsworth] is making glow powder with household chemicals. When we saw the title of the video we though it would be fun to try it ourselves ...

It may also help restore cognitive performance in people with sleep loss. Cocoa powder contains iron, zinc, and selenium. These minerals help your body function and boost your immune system.

When zinc powder is used, instead of larger pieces of zinc, the reaction is faster. Explain, using ideas about particles, why the reaction is faster when zinc powder is used.