Please help.. I am begging A wave's frequency refers to . *

the number of wavelengths passing by a given point in a period of time

the heigh of a wave as it passes a given point

the length of a wave

the strength of a wave

Which organic molecule is found in the chromatin of cells?

Compare and contrast physical changes with chemical changes.

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.