Aglass object receives a positive charge by rubbing it with a silk cloth. in the rubbing process, have protons been added to the object or have electrons been removed from it?

Idon’t understand this page, can someone ?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Match the mixture with the substance// i really need on this guys (it’s a pic btw)