2. Scrie formulele structurale pentru izoalcanii: 3-etil-2,2 dimetilpentan 5-etil-2-metilheptan 2,2,3,3-tetrametilbutan 3,3-dimetiloctan 2,2,4-trimetilpentan CH3 | CH3 – C – CH – CH2 – CH3 | | CH3 CH2 – CH3

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)

An aqueous solution of hydroiodic acid is standardized by titration with a 0.186 m solution of calcium hydroxide. if 26.5 ml of base are required to neutralize 20.3 ml of the acid, what is the molarity of the hydroiodic acid solution? m hydroiodic acid

How many moles are in 250 grams of tungsten (w)? * 4.4x10^23 moles 4.2x10^23 moles 0.7 moles 1.4 moles