Explain the difference in the boiling points of 2-methylpropane and 2-iodo-2-methylpropane.

Jerrold has to buy 12 copies of a textbook which costs $36.25 per copy. how much must he spend for them?

Blank is the amount of energy in a sound wave per unit of time and is also related to the loudness of a sound

Afish fossil is found in a rock. a foot bone and tooth are found in an older layer of the same rock. what can scientists learn from the rock? a) the area changed from land to water. b) the area changed from water to land. c) the area has always been land. d) the area was once an ocean.