True or false? All four types of macromolecules always contain carbon (c), hydrogen (h), and oxygen (o), but not all of them contain nitrogen (n).

If there is a New Moon at midnight on October 1, when would the next New Moon occur? A. October 8 B. October 16 C. October 30 D. October 1 a year later

What does AC stand for in physics? O A. alternating current B. alternative circuit OC. alternating composition OD. all charge

A weak acid placed in water contains a. the same number of unionized acid molecules as a strong acid in water. b. no unionized acid molecules. c. a lower concentration of unionized acid molecules than a strong acid in water. d.

A substance is composed of only one kind of atom cannot be separated into simpler substances are converted into another substance by chemical processes which category would you classify the substance

Calculate the number of Li atoms in 9.5 moles of Li

Which answer correctly describes the difference between covalent and ionic bonds? A. ionic: transfer of protons covalent: transfer of electrons B. ionic: transfer of electrons covalent: transfer of protons C.

What are the first five elementsof the periodic table?

Name 3 characteristics that can be used to identify minerals

Hemoglobin, the oxygen-carrying protein in red blood cells, has four iron atoms per molecules ad contains 0.340 percent iron by mass. calculate the molar mass of hemoglobin

Nancy wants to find out how the steepness of a hill's slope affects the amount of soil that erodes from it. She has soil, a long pan, and a pile of books with which to build a model hillside. She has a watering can to model rainfall.