Which is the primary type of radiation from the sun that is absorbed by the ozone layer? A. infrared radiatin
B. UV-B
C. X-rays
D. UV-C
E. UV-A

Which statement best describes the flow of energy in this scenario

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

What is the solubility-product constant of barium sulfate, baso4, if a saturated solution is 1.03 ´ 10-5 m?