What is the overall cell potential for this redox reaction?
ba + ca2+ → ba2+ + ca

given: ba2+ + 2e− → ba(s) = –2.90 and ca2+ + 2e− → ca(s) = –2.87

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 many moles of gas are present if p=11 atm, v=12l, t=185k?

Which statement correctly identifies the scientific question and describes why the question is scientific? question 1 refers to the supernatural.question 2 reflects a moral or social value.question 3 refers to something that can be measured.question 4 reflects a question that can’t be observed.