What will be the name of this hydrocarbon ? 2,3 dimethyl nonane,

2,3 dimethyl ,4 ethyl heptane

2,3 dimethyl ,4 propyl hexane

4 ethyl 2,3 dimethyl heptane

with explanation ,please

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.

Compare and contrast physical changes with chemical changes.