An atom of phosphorus has an atomic number of 15 and a mass number of 31. how many protons and neutrons does it contain?

The average kinetic energy of asample of water molecule is?

How do scientists test ideas about chemical evolution?

Which molecule makes up the 2 part of the cell membrain

A solution is made by dissolving 373.5 g of Pb (NO3) 2 (molar mass: 331.2 g/mol) in 2.00 * 103 g of water. What is the molality of the solution?

What word is used synonymously with the word "base"

What does composition mean in science

Which of the following descriptions best describes a solid substance? A. The volume of the substance depends on the container it is in. B. Volume of the substance changes depending on its location. C. The shape of the substance changes often. D.

Which element is present in all amino acids but not necessarily in fats or carbohydrates?

Describe the attractive forces and repulsive forces that exist between two atoms as the atoms move closer together

A bag of gum drops contains 14 orange gumdrops, 8 yellow gumdrops, and 12 black gumdrops. What is the percentage of yellow gumdrops?