5. Which of these changes is a chemical change? A. iron rusting B. water boiling C. glass breaking D. a balloon popping

Place the following descriptions in the correct order (1 to 4) to explain how lightning forms. A. Negative charges on the bottom of the cloud move toward the positive charges in the ground. B.

A weather front occurs when two air masses of differing temperatures meet. When a cold air mass meets a warm air mass, for example, what will happen to the warm air? A. It will reverse directions. B. It will sink. C. It will rise. D.

A solution contains 90mL of methanol. 18 mL of propanol and 2Ml of diethyl ether. Which is the solvent in this solution

Arrange the following atoms according to decreasing effective nuclear charge experienced by their valence electrons: Cl, Na, P, and S. Rank from largest to smallest. To rank items as equivalent, overlap them. Cl Na P S Largest Smallest

How many traditional areas of study can chemistry be divided into

Which of these molecules is least likely to form a hydrogen bond with a water molecule

George is writing an essay about the role of observation and inference in the development of the atomic theory. He wants to explain why it was more difficult to observe the presence of neutrons in atoms.

Which pair of statements below is correct? Multiple Choice An octet is formed via ionic bonding when one or more valence electrons are transferred from one atom to another.

If wave A has a frequency of 4.60 x 10^14 s-1, what is the wavelength in nanometers (show your work) ?

What is the mass in grams of 85.32 mL of blood plasma with a density of 1.03 g/mL?