2. An element's atomic number is the A. number of protons in an atom's nucleus. B. mass of the atom. C. weight of the atom. D. sum of the protons and neutrons in an atom.

The nitrogen and hydrogen atoms that make up ammonia are held together by a

What types of questions can be answered through science and what questions are beyond the boundaries of science? Be specific and give examples to support your answer.

The maximum amount of solute that dissolves in a given amount of solvent and forms a stable solution is called the

When a firework is lit a fuel and an oxidising agent react. in such a firework, magnesium is the fuel and barium nitrate is the oxidising agent. which solid products are produced when the firework is lit?

One of the important reactions in living cells from which the organism draws energy is the reaction of adenosine triphosphate (ATP) with water to give adenosine diphosphate (ADP) and free phosphate ion.

You just calculated that the heat of fusion for chloromethane is 6400 J/mol. The heat of fusion for hydrogen is 120 J/mol. Which of the following account for this difference? a. Hydrogen has stronger intermolecular forces than chloromethane. b.

Magnesium burns with a very bright light. When the flame goes out, a White powder is left behind. what is the word equation for this reaction.

Identify the types of intermolecular forces found for each of the liquids and relate these to the shape of the drop as seen from the side. Include the terms cohesive and adhesive forces properly in your explanations.

Which type of experiment follows ethical standards?

What kind of change occurs when a compound is separated into its components?