Using the activity series, the reaction 2Al+6HBr-2 AlBr3+3 H2 will only occur ifAl is above Be on the periodic table or heat is added to the reaction or a precipitate forms or Al is above H on the activity series

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.

Identify the missing numbers below to show the result of multiplying the numbers (1.6 × 10-19)(5.0 × 106) = c × 10d