I’m making an invisible ink experiment. I’m using baking soda, water and a heat source. How do I explain the chemical/physical reaction?

Asample of silver (with work function ? = 4.52 ev) is exposed to an ultraviolet light source (? = 200 nm), which results in the ejection of photoelectrons. what changes will be observed if: silver is replaced with copper (? = 5.10 ev) more photoelectrons ejected no photoelectrons are emitted fewer photoelectrons ejected more energetic photoelectrons (on average) less energetic photoelectrons (on average)

What produces wave a)sound b) heats c)transfer of energy d)vibrations

Amap that uses a range of colors and shading to represent the elevation, depth, or landscape of specific features on earth is a/an map.