The substances in a chemical reaction that are combined or separated to form new substances are

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

1. explain hydrogen peroxide, h 2 o 2 properties and decomposition reaction. 2. describe how each of the following natural cycles plays a part in earth’s climate system. (a) the water cycle (b) the carbon cycle

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver