What is the fractional distillation

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)

How have the greenhouse gasses increased from the year 2000 to 2018

How many moles of sulfur dioxide are produced when 4.38 moles of oxygen completely react with iron (iv) sulfide