Explain in your own words what an atom and element are.

The phase change from gas to liquid is called

What are the structural features of purines and pyrimidines?

In condensation, a gas becomes a liquid. a gas becomes a solid. a solid becomes a gas. a liquid becomes a gas.

7. How many moles of argon are there in 20.0 L, at 25 degrees Celsius and 96.8 kPa?

A compound has a formula mass of 61.98 amu and is comprised of atoms of sodium and oxygen in a definite ratio. the name of the compound described here is

Compare and contrast chemical potential energy and elastic potential energy

Which of the answer choices best describes how electrons move, according to modern atomic theory? They vibrate in place. They move like planets. They move in orbitals. They slide past each other.

The total solute concentration of a red blood cell is about 2%. Sucrose cannot pass through a red blood cell's plasma membrane, but water and urea can. Which of the following solutions will cause a red blood cell to shrink? a.

A geologist discovered fossils of marine animals in a layer of sedimentary rock in the desert. Based on this discovery, what conclusion can the geologist draw?

How do metals form chemical bonds with other metals?