Which of the following materials could have been found in the giant cloud that formed the
solar system?
ohydrogen and helium
ohydrogen and oxygen
o carbon dioxide and oxygen
o liquid and solid water

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)

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

How many moles are in 7.2 x 10^23 carbon molecules? (*round to the nearest hundredth and include the unit "mol c" after your number) question 6 options: